Soket

Soket adalah teknologi transfer data tingkat rendah di atasnya banyak protokol jaringan diimplementasikan. UWP menawarkan kelas soket TCP dan UDP untuk aplikasi client-server atau peer-to-peer, apakah koneksi berumur panjang atau koneksi yang sudah mapan tidak diperlukan.

Topik ini berfokus pada cara menggunakan kelas soket Universal Windows Platform (UWP) yang berada di Windows. Ruang nama Networking.Sockets. Tetapi Anda juga dapat menggunakan Windows Sockets 2 (Winsock) di aplikasi UWP.

Catatan

Sebagai konsekuensi dari isolasi jaringan, Windows melarang pembuatan koneksi soket (Sockets atau WinSock) antara dua aplikasi UWP yang berjalan pada mesin yang sama; apakah itu melalui alamat loopback lokal (127.0.0.0), atau dengan secara eksplisit menentukan alamat IP lokal. Untuk detail tentang mekanisme di mana aplikasi UWP dapat berkomunikasi satu sama lain, lihat Komunikasi app-to-app.

Membangun klien dan server soket TCP dasar

Soket TCP (Transmission Control Protocol) menyediakan transfer data jaringan tingkat rendah di kedua arah untuk koneksi yang berumur panjang. Soket TCP adalah fitur yang mendasari yang digunakan oleh sebagian besar protokol jaringan yang digunakan di Internet. Untuk menunjukkan operasi TCP dasar, kode contoh di bawah ini menunjukkan StreamSocket dan StreamSocketListener mengirim dan menerima data melalui TCP untuk membentuk klien dan server echo.

Untuk mulai dengan sesedikit mungkin bagian yang bergerak — dan untuk menghindari masalah isolasi jaringan untuk saat ini — buat proyek baru, dan letakkan klien dan kode server di bawah ini ke dalam proyek yang sama.

Anda harus mendeklarasikan kemampuan aplikasi dalam proyek Anda. Buka file sumber manifes paket aplikasi Anda ( Package.appxmanifest file) dan, pada tab Kemampuan, periksa Jaringan Pribadi (Client & Server). Beginilah tampilannya Package.appxmanifest dalam markup.

<Capability Name="privateNetworkClientServer" />

Alih-alih privateNetworkClientServer, Anda dapat mendeklarasikan internetClientServer jika Anda terhubung melalui internet. Baik StreamSocket dan StreamSocketListener membutuhkan satu atau lain kemampuan aplikasi ini untuk dideklarasikan.

Klien dan server echo, menggunakan soket TCP

Bangun StreamSocketListener dan mulailah mendengarkan koneksi TCP yang masuk. Acara StreamSocketListener.ConnectionReceived dinaikkan setiap kali klien membuat koneksi dengan StreamSocketListener.

Juga membangun StreamSocket, membuat koneksi ke server, mengirim permintaan, dan menerima tanggapan.

Buat halaman baru bernama StreamSocketAndListenerPage. Masukkan markup StreamSocketAndListenerPage.xamlXAML, dan masukkan kode imperatif ke StreamSocketAndListenerPage dalam kelas.

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel>
        <TextBlock Margin="9.6,0" Style="{StaticResource TitleTextBlockStyle}" Text="TCP socket example"/>
        <TextBlock Margin="7.2,0,0,0" Style="{StaticResource HeaderTextBlockStyle}" Text="StreamSocket &amp; StreamSocketListener"/>
    </StackPanel>

    <Grid Grid.Row="1">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <TextBlock Margin="9.6" Style="{StaticResource SubtitleTextBlockStyle}" Text="client"/>
        <ListBox x:Name="clientListBox" Grid.Row="1" Margin="9.6"/>
        <TextBlock Grid.Column="1" Margin="9.6" Style="{StaticResource SubtitleTextBlockStyle}" Text="server"/>
        <ListBox x:Name="serverListBox" Grid.Column="1" Grid.Row="1" Margin="9.6"/>
    </Grid>
</Grid>

// Every protocol typically has a standard port number. For example, HTTP is typically 80, FTP is 20 and 21, etc.
// For this example, we'll choose an arbitrary port number.
static string PortNumber = "1337";

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    this.StartServer();
    this.StartClient();
}

private async void StartServer()
{
    try
    {
        var streamSocketListener = new Windows.Networking.Sockets.StreamSocketListener();

        // The ConnectionReceived event is raised when connections are received.
        streamSocketListener.ConnectionReceived += this.StreamSocketListener_ConnectionReceived;

        // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
        await streamSocketListener.BindServiceNameAsync(StreamSocketAndListenerPage.PortNumber);

        this.serverListBox.Items.Add("server is listening...");
    }
    catch (Exception ex)
    {
        Windows.Networking.Sockets.SocketErrorStatus webErrorStatus = Windows.Networking.Sockets.SocketError.GetStatus(ex.GetBaseException().HResult);
        this.serverListBox.Items.Add(webErrorStatus.ToString() != "Unknown" ? webErrorStatus.ToString() : ex.Message);
    }
}

private async void StreamSocketListener_ConnectionReceived(Windows.Networking.Sockets.StreamSocketListener sender, Windows.Networking.Sockets.StreamSocketListenerConnectionReceivedEventArgs args)
{
    string request;
    using (var streamReader = new StreamReader(args.Socket.InputStream.AsStreamForRead()))
    {
        request = await streamReader.ReadLineAsync();
    }

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add(string.Format("server received the request: \"{0}\"", request)));

    // Echo the request back as the response.
    using (Stream outputStream = args.Socket.OutputStream.AsStreamForWrite())
    {
        using (var streamWriter = new StreamWriter(outputStream))
        {
            await streamWriter.WriteLineAsync(request);
            await streamWriter.FlushAsync();
        }
    }

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add(string.Format("server sent back the response: \"{0}\"", request)));

    sender.Dispose();

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add("server closed its socket"));
}

private async void StartClient()
{
    try
    {
        // Create the StreamSocket and establish a connection to the echo server.
        using (var streamSocket = new Windows.Networking.Sockets.StreamSocket())
        {
            // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
            var hostName = new Windows.Networking.HostName("localhost");

            this.clientListBox.Items.Add("client is trying to connect...");

            await streamSocket.ConnectAsync(hostName, StreamSocketAndListenerPage.PortNumber);

            this.clientListBox.Items.Add("client connected");

            // Send a request to the echo server.
            string request = "Hello, World!";
            using (Stream outputStream = streamSocket.OutputStream.AsStreamForWrite())
            {
                using (var streamWriter = new StreamWriter(outputStream))
                {
                    await streamWriter.WriteLineAsync(request);
                    await streamWriter.FlushAsync();
                }
            }

            this.clientListBox.Items.Add(string.Format("client sent the request: \"{0}\"", request));

            // Read data from the echo server.
            string response;
            using (Stream inputStream = streamSocket.InputStream.AsStreamForRead())
            {
                using (StreamReader streamReader = new StreamReader(inputStream))
                {
                    response = await streamReader.ReadLineAsync();
                }
            }

            this.clientListBox.Items.Add(string.Format("client received the response: \"{0}\" ", response));
        }

        this.clientListBox.Items.Add("client closed its socket");
    }
    catch (Exception ex)
    {
        Windows.Networking.Sockets.SocketErrorStatus webErrorStatus = Windows.Networking.Sockets.SocketError.GetStatus(ex.GetBaseException().HResult);
        this.clientListBox.Items.Add(webErrorStatus.ToString() != "Unknown" ? webErrorStatus.ToString() : ex.Message);
    }
}

#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Networking.Sockets.h>
#include <winrt/Windows.Storage.Streams.h>
#include <winrt/Windows.UI.Core.h>
#include <winrt/Windows.UI.Xaml.Navigation.h>
#include <sstream>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::StreamSocketListener m_streamSocketListener;
    Windows::Networking::Sockets::StreamSocket m_streamSocket;

public:
    void OnNavigatedTo(NavigationEventArgs const& /* e */)
    {
        StartServer();
        StartClient();
    }

private:
    IAsyncAction StartServer()
    {
        try
        {
            // The ConnectionReceived event is raised when connections are received.
            m_streamSocketListener.ConnectionReceived({ this, &StreamSocketAndListenerPage::OnConnectionReceived });

            // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
            // Every protocol typically has a standard port number. For example, HTTP is typically 80, FTP is 20 and 21, etc.
            // For this example, we'll choose an arbitrary port number.
            co_await m_streamSocketListener.BindServiceNameAsync(L"1337");
            serverListBox().Items().Append(winrt::box_value(L"server is listening..."));
        }
        catch (winrt::hresult_error const& ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus{ Windows::Networking::Sockets::SocketError::GetStatus(ex.to_abi()) };
            serverListBox().Items().Append(webErrorStatus != Windows::Networking::Sockets::SocketErrorStatus::Unknown ? winrt::box_value(winrt::to_hstring((int32_t)webErrorStatus)) : winrt::box_value(winrt::to_hstring(ex.to_abi())));
        }
    }

    IAsyncAction OnConnectionReceived(Windows::Networking::Sockets::StreamSocketListener /* sender */, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs args)
    {
        try
        {
            auto socket{ args.Socket() }; // Keep the socket referenced, and alive.
            DataReader dataReader{ socket.InputStream() };

            unsigned int bytesLoaded = co_await dataReader.LoadAsync(sizeof(unsigned int));

            unsigned int stringLength = dataReader.ReadUInt32();
            bytesLoaded = co_await dataReader.LoadAsync(stringLength);
            winrt::hstring request = dataReader.ReadString(bytesLoaded);

            serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
            {
                std::wstringstream wstringstream;
                wstringstream << L"server received the request: \"" << request.c_str() << L"\"";
                serverListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));
            });

            // Echo the request back as the response.
            DataWriter dataWriter{ socket.OutputStream() };
            dataWriter.WriteUInt32(request.size());
            dataWriter.WriteString(request);
            co_await dataWriter.StoreAsync();
            dataWriter.DetachStream();

            serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
            {
                std::wstringstream wstringstream;
                wstringstream << L"server sent back the response: \"" << request.c_str() << L"\"";
                serverListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));
            });

            m_streamSocketListener = nullptr;

            serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
            {
                serverListBox().Items().Append(winrt::box_value(L"server closed its socket"));
            });
        }
        catch (winrt::hresult_error const& ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus{ Windows::Networking::Sockets::SocketError::GetStatus(ex.to_abi()) };
            serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
            {
                serverListBox().Items().Append(webErrorStatus != Windows::Networking::Sockets::SocketErrorStatus::Unknown ? winrt::box_value(winrt::to_hstring((int32_t)webErrorStatus)) : winrt::box_value(winrt::to_hstring(ex.to_abi())));
            });
        }
    }

    IAsyncAction StartClient()
    {
        try
        {
            // Establish a connection to the echo server.

            // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
            Windows::Networking::HostName hostName{ L"localhost" };

            clientListBox().Items().Append(winrt::box_value(L"client is trying to connect..."));

            co_await m_streamSocket.ConnectAsync(hostName, L"1337");
            clientListBox().Items().Append(winrt::box_value(L"client connected"));

            // Send a request to the echo server.
            DataWriter dataWriter{ m_streamSocket.OutputStream() };
            winrt::hstring request{ L"Hello, World!" };
            dataWriter.WriteUInt32(request.size());
            dataWriter.WriteString(request);

            co_await dataWriter.StoreAsync();

            std::wstringstream wstringstream;
            wstringstream << L"client sent the request: \"" << request.c_str() << L"\"";
            clientListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));

            co_await dataWriter.FlushAsync();
            dataWriter.DetachStream();

            // Read data from the echo server.
            DataReader dataReader{ m_streamSocket.InputStream() };
            unsigned int bytesLoaded = co_await dataReader.LoadAsync(sizeof(unsigned int));
            unsigned int stringLength = dataReader.ReadUInt32();
            bytesLoaded = co_await dataReader.LoadAsync(stringLength);
            winrt::hstring response{ dataReader.ReadString(bytesLoaded) };

            wstringstream.str(L"");
            wstringstream << L"client received the response: \"" << response.c_str() << L"\"";
            clientListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));

            m_streamSocket = nullptr;

            clientListBox().Items().Append(winrt::box_value(L"client closed its socket"));
        }
        catch (winrt::hresult_error const& ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus{ Windows::Networking::Sockets::SocketError::GetStatus(ex.to_abi()) };
            serverListBox().Items().Append(webErrorStatus != Windows::Networking::Sockets::SocketErrorStatus::Unknown ? winrt::box_value(winrt::to_hstring((int32_t)webErrorStatus)) : winrt::box_value(winrt::to_hstring(ex.to_abi())));
        }
    }

#include <ppltasks.h>
#include <sstream>
...
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::StreamSocketListener^ streamSocketListener;
    Windows::Networking::Sockets::StreamSocket^ streamSocket;

protected:
    virtual void OnNavigatedTo(NavigationEventArgs^ e) override
    {
        this->StartServer();
        this->StartClient();
    }

private:
    void StartServer()
    {
        try
        {
            this->streamSocketListener = ref new Windows::Networking::Sockets::StreamSocketListener();

            // The ConnectionReceived event is raised when connections are received.
            streamSocketListener->ConnectionReceived += ref new TypedEventHandler<Windows::Networking::Sockets::StreamSocketListener^, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^>(this, &StreamSocketAndListenerPage::StreamSocketListener_ConnectionReceived);

            // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
            // Every protocol typically has a standard port number. For example, HTTP is typically 80, FTP is 20 and 21, etc.
            // For this example, we'll choose an arbitrary port number.
            Concurrency::create_task(streamSocketListener->BindServiceNameAsync(L"1337")).then(
                [=]
            {
                this->serverListBox->Items->Append(L"server is listening...");
            });
        }
        catch (Platform::Exception^ ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus = Windows::Networking::Sockets::SocketError::GetStatus(ex->HResult);
            this->serverListBox->Items->Append(webErrorStatus.ToString() != L"Unknown" ? webErrorStatus.ToString() : ex->Message);
        }
    }

    void StreamSocketListener_ConnectionReceived(Windows::Networking::Sockets::StreamSocketListener^ sender, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^ args)
    {
        try
        {
            auto dataReader = ref new DataReader(args->Socket->InputStream);

            Concurrency::create_task(dataReader->LoadAsync(sizeof(unsigned int))).then(
                [=](unsigned int bytesLoaded)
            {
                unsigned int stringLength = dataReader->ReadUInt32();
                Concurrency::create_task(dataReader->LoadAsync(stringLength)).then(
                    [=](unsigned int bytesLoaded)
                {
                    Platform::String^ request = dataReader->ReadString(bytesLoaded);
                    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
                        [=]
                    {
                        std::wstringstream wstringstream;
                        wstringstream << L"server received the request: \"" << request->Data() << L"\"";
                        this->serverListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
                    }));

                    // Echo the request back as the response.
                    auto dataWriter = ref new DataWriter(args->Socket->OutputStream);
                    dataWriter->WriteUInt32(request->Length());
                    dataWriter->WriteString(request);
                    Concurrency::create_task(dataWriter->StoreAsync()).then(
                        [=](unsigned int)
                    {
                        dataWriter->DetachStream();

                        this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
                            [=]()
                        {
                            std::wstringstream wstringstream;
                            wstringstream << L"server sent back the response: \"" << request->Data() << L"\"";
                            this->serverListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
                        }));

                        delete this->streamSocketListener;
                        this->streamSocketListener = nullptr;

                        this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([=]() {this->serverListBox->Items->Append(L"server closed its socket"); }));
                    });
                });
            });
        }
        catch (Platform::Exception^ ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus = Windows::Networking::Sockets::SocketError::GetStatus(ex->HResult);
            this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([=]() {this->serverListBox->Items->Append(webErrorStatus.ToString() != L"Unknown" ? webErrorStatus.ToString() : ex->Message); }));
        }
    }

    void StartClient()
    {
        try
        {
            // Create the StreamSocket and establish a connection to the echo server.
            this->streamSocket = ref new Windows::Networking::Sockets::StreamSocket();

            // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
            auto hostName = ref new Windows::Networking::HostName(L"localhost");

            this->clientListBox->Items->Append(L"client is trying to connect...");

            Concurrency::create_task(this->streamSocket->ConnectAsync(hostName, L"1337")).then(
                [=](Concurrency::task< void >)
            {
                this->clientListBox->Items->Append(L"client connected");

                // Send a request to the echo server.
                auto dataWriter = ref new DataWriter(this->streamSocket->OutputStream);
                auto request = ref new Platform::String(L"Hello, World!");
                dataWriter->WriteUInt32(request->Length());
                dataWriter->WriteString(request);

                Concurrency::create_task(dataWriter->StoreAsync()).then(
                    [=](Concurrency::task< unsigned int >)
                {
                    std::wstringstream wstringstream;
                    wstringstream << L"client sent the request: \"" << request->Data() << L"\"";
                    this->clientListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));

                    Concurrency::create_task(dataWriter->FlushAsync()).then(
                        [=](Concurrency::task< bool >)
                    {
                        dataWriter->DetachStream();

                        // Read data from the echo server.
                        auto dataReader = ref new DataReader(this->streamSocket->InputStream);
                        Concurrency::create_task(dataReader->LoadAsync(sizeof(unsigned int))).then(
                            [=](unsigned int bytesLoaded)
                        {
                            unsigned int stringLength = dataReader->ReadUInt32();
                            Concurrency::create_task(dataReader->LoadAsync(stringLength)).then(
                                [=](unsigned int bytesLoaded)
                            {
                                Platform::String^ response = dataReader->ReadString(bytesLoaded);
                                this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
                                    [=]
                                {
                                    std::wstringstream wstringstream;
                                    wstringstream << L"client received the response: \"" << response->Data() << L"\"";
                                    this->clientListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));

                                    delete this->streamSocket;
                                    this->streamSocket = nullptr;

                                    this->clientListBox->Items->Append(L"client closed its socket");
                                }));
                            });
                        });
                    });
                });
            });
        }
        catch (Platform::Exception^ ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus = Windows::Networking::Sockets::SocketError::GetStatus(ex->HResult);
            this->serverListBox->Items->Append(webErrorStatus.ToString() != L"Unknown" ? webErrorStatus.ToString() : ex->Message);
        }
    }

Referensi ke StreamSockets dalam kelanjutan C ++ PPL (berlaku untuk C ++/CX, terutama)

Catatan

Jika Anda menggunakan coroutine C ++/WinRT, dan Anda meneruskan parameter berdasarkan nilai, maka masalah ini tidak berlaku. Untuk rekomendasi melewati parameter, lihat Operasi konkurensi dan asinkron dengan C++/WinRT.

StreamSocket tetap hidup selama ada pembacaan/tulis aktif pada aliran input/outputnya (mari kita ambil contoh StreamSocketListenerConnectionReceivedEventArgs.Socket yang dapat Anda akses di streamSocketListener.ConnectionReceived event handler). Saat Anda memanggil DataReader.LoadAsync (atau ReadAsync/WriteAsync/StoreAsync), maka itu memegang referensi ke soket (melalui aliran input soket) sampai penangan peristiwa selesai (jika ada) dari LoadAsync selesai dieksekusi.

Pustaka Pola Paralel (PPL) tidak menjadwalkan alur alur tugas secara default. Dengan kata lain, menambahkan tugas kelanjutan (dengan task::then()) tidak menjamin bahwa tugas kelanjutan akan dijalankan inline sebagai penangan penyelesaian.

void StreamSocketListener_ConnectionReceived(Windows::Networking::Sockets::StreamSocketListener^ sender, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^ args)
{
    auto dataReader = ref new DataReader(args->Socket->InputStream);
    Concurrency::create_task(dataReader->LoadAsync(sizeof(unsigned int))).then(
        [=](unsigned int bytesLoaded)
    {
        // Work in here isn't guaranteed to execute inline as the completion handler of the LoadAsync.
    });
}

Dari perspektif StreamSocket, penangan penyelesaian dilakukan mengeksekusi (dan soket memenuhi syarat untuk dibuang) sebelum badan kelanjutan berjalan. Jadi, untuk menjaga soket Anda agar tidak dibuang jika Anda ingin menggunakannya di dalam kelanjutan itu, Anda perlu mereferensikan soket secara langsung (melalui lambda capture) dan menggunakannya, atau secara tidak langsung (dengan terus mengakses args->Socket di dalam kelanjutan), atau memaksa tugas kelanjutan untuk sejalan. Anda dapat melihat teknik pertama (lambda capture) beraksi dalam sampel StreamSocket. Kode C ++/CX di bagian Build a basic TCP socket client dan server di atas menggunakan teknik kedua—ia menggemakan permintaan kembali sebagai respons, dan mengakses args->Socket dari dalam salah satu kelanjutan terdalam.

Teknik ketiga sesuai ketika Anda tidak menggemakan respons kembali. Anda menggunakan task_continuation_context::use_synchronous_execution() opsi untuk memaksa PPL untuk menjalankan inline tubuh kelanjutan. Berikut adalah contoh kode yang menunjukkan cara melakukannya.

void StreamSocketListener_ConnectionReceived(Windows::Networking::Sockets::StreamSocketListener^ sender, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^ args)
{
    auto dataReader = ref new DataReader(args->Socket->InputStream);

    Concurrency::create_task(dataReader->LoadAsync(sizeof(unsigned int))).then(
        [=](unsigned int bytesLoaded)
    {
        unsigned int messageLength = dataReader->ReadUInt32();
        Concurrency::create_task(dataReader->LoadAsync(messageLength)).then(
            [=](unsigned int bytesLoaded)
        {
            Platform::String^ request = dataReader->ReadString(bytesLoaded);
            this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
                [=]
            {
                std::wstringstream wstringstream;
                wstringstream << L"server received the request: \"" << request->Data() << L"\"";
                this->serverListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
            }));
        });
    }, Concurrency::task_continuation_context::use_synchronous_execution());
}

Perilaku ini berlaku untuk semua soket dan kelas WebSockets di Windows. Ruang nama Networking.Sockets. Tetapi skenario sisi klien biasanya menyimpan soket dalam variabel anggota, sehingga masalah ini paling berlaku untuk skenario StreamSocketListener.ConnectionReceived , seperti yang diilustrasikan di atas.

Membangun klien dan server soket UDP dasar

Soket UDP (User Datagram Protocol) mirip dengan soket TCP karena juga menyediakan transfer data jaringan tingkat rendah di kedua arah. Tapi, sementara soket TCP adalah untuk koneksi berumur panjang, soket UDP adalah untuk aplikasi di mana koneksi yang ditetapkan tidak diperlukan. Karena soket UDP tidak mempertahankan koneksi pada kedua titik akhir, soket UDP tidak mempertahankan koneksi di kedua titik akhir, mereka adalah solusi cepat dan sederhana untuk jaringan antar mesin jarak jauh. Tetapi soket UDP tidak memastikan integritas paket jaringan atau bahkan apakah paket berhasil mencapai tujuan jarak jauh sama sekali. Jadi aplikasi Anda perlu dirancang untuk mentolerir itu. Beberapa contoh aplikasi yang menggunakan soket UDP adalah penemuan jaringan lokal, dan klien obrolan lokal.

Untuk menunjukkan operasi UDP dasar, kode contoh di bawah ini menunjukkan kelas DatagramSocket yang digunakan untuk mengirim dan menerima data melalui UDP untuk membentuk klien dan server echo. Buat proyek baru, dan masukkan klien dan kode server di bawah ini ke dalam proyek yang sama. Sama seperti untuk soket TCP, Anda harus mendeklarasikan kemampuan aplikasi Private Networks (Client & Server ).

Klien dan server echo, menggunakan soket UDP

Bangun DatagramSocket untuk memainkan peran server gema, mengikatnya ke nomor port tertentu, mendengarkan pesan UDP yang masuk, dan menggemakannya kembali. Peristiwa DatagramSocket.MessageReceived diangkat ketika pesan direklamasi pada soket.

Bangun DatagramSocket lain untuk memainkan peran klien echo, mengikatnya ke nomor port tertentu, mengirim pesan UDP, dan menerima respons.

Buat halaman baru bernama DatagramSocketPage. Masukkan markup DatagramSocketPage.xamlXAML, dan masukkan kode imperatif ke DatagramSocketPage dalam kelas.

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel>
        <TextBlock Margin="9.6,0" Style="{StaticResource TitleTextBlockStyle}" Text="UDP socket example"/>
        <TextBlock Margin="7.2,0,0,0" Style="{StaticResource HeaderTextBlockStyle}" Text="DatagramSocket"/>
    </StackPanel>

    <Grid Grid.Row="1">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <TextBlock Margin="9.6" Style="{StaticResource SubtitleTextBlockStyle}" Text="client"/>
        <ListBox x:Name="clientListBox" Grid.Row="1" Margin="9.6"/>
        <TextBlock Grid.Column="1" Margin="9.6" Style="{StaticResource SubtitleTextBlockStyle}" Text="server"/>
        <ListBox x:Name="serverListBox" Grid.Column="1" Grid.Row="1" Margin="9.6"/>
    </Grid>
</Grid>

// Every protocol typically has a standard port number. For example, HTTP is typically 80, FTP is 20 and 21, etc.
// For this example, we'll choose different arbitrary port numbers for client and server, since both will be running on the same machine.
static string ClientPortNumber = "1336";
static string ServerPortNumber = "1337";

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    this.StartServer();
    this.StartClient();
}

private async void StartServer()
{
    try
    {
        var serverDatagramSocket = new Windows.Networking.Sockets.DatagramSocket();

        // The ConnectionReceived event is raised when connections are received.
        serverDatagramSocket.MessageReceived += ServerDatagramSocket_MessageReceived;

        this.serverListBox.Items.Add("server is about to bind...");

        // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
        await serverDatagramSocket.BindServiceNameAsync(DatagramSocketPage.ServerPortNumber);

        this.serverListBox.Items.Add(string.Format("server is bound to port number {0}", DatagramSocketPage.ServerPortNumber));
    }
    catch (Exception ex)
    {
        Windows.Networking.Sockets.SocketErrorStatus webErrorStatus = Windows.Networking.Sockets.SocketError.GetStatus(ex.GetBaseException().HResult);
        this.serverListBox.Items.Add(webErrorStatus.ToString() != "Unknown" ? webErrorStatus.ToString() : ex.Message);
    }
}

private async void ServerDatagramSocket_MessageReceived(Windows.Networking.Sockets.DatagramSocket sender, Windows.Networking.Sockets.DatagramSocketMessageReceivedEventArgs args)
{
    string request;
    using (DataReader dataReader = args.GetDataReader())
    {
        request = dataReader.ReadString(dataReader.UnconsumedBufferLength).Trim();
    }

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add(string.Format("server received the request: \"{0}\"", request)));

    // Echo the request back as the response.
    using (Stream outputStream = (await sender.GetOutputStreamAsync(args.RemoteAddress, DatagramSocketPage.ClientPortNumber)).AsStreamForWrite())
    {
        using (var streamWriter = new StreamWriter(outputStream))
        {
            await streamWriter.WriteLineAsync(request);
            await streamWriter.FlushAsync();
        }
    }

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add(string.Format("server sent back the response: \"{0}\"", request)));

    sender.Dispose();

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.serverListBox.Items.Add("server closed its socket"));
}

private async void StartClient()
{
    try
    {
        // Create the DatagramSocket and establish a connection to the echo server.
        var clientDatagramSocket = new Windows.Networking.Sockets.DatagramSocket();

        clientDatagramSocket.MessageReceived += ClientDatagramSocket_MessageReceived;

        // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
        var hostName = new Windows.Networking.HostName("localhost");

        this.clientListBox.Items.Add("client is about to bind...");

        await clientDatagramSocket.BindServiceNameAsync(DatagramSocketPage.ClientPortNumber);

        this.clientListBox.Items.Add(string.Format("client is bound to port number {0}", DatagramSocketPage.ClientPortNumber));

        // Send a request to the echo server.
        string request = "Hello, World!";
        using (var serverDatagramSocket = new Windows.Networking.Sockets.DatagramSocket())
        {
            using (Stream outputStream = (await serverDatagramSocket.GetOutputStreamAsync(hostName, DatagramSocketPage.ServerPortNumber)).AsStreamForWrite())
            {
                using (var streamWriter = new StreamWriter(outputStream))
                {
                    await streamWriter.WriteLineAsync(request);
                    await streamWriter.FlushAsync();
                }
            }
        }

        this.clientListBox.Items.Add(string.Format("client sent the request: \"{0}\"", request));
    }
    catch (Exception ex)
    {
        Windows.Networking.Sockets.SocketErrorStatus webErrorStatus = Windows.Networking.Sockets.SocketError.GetStatus(ex.GetBaseException().HResult);
        this.clientListBox.Items.Add(webErrorStatus.ToString() != "Unknown" ? webErrorStatus.ToString() : ex.Message);
    }
}

private async void ClientDatagramSocket_MessageReceived(Windows.Networking.Sockets.DatagramSocket sender, Windows.Networking.Sockets.DatagramSocketMessageReceivedEventArgs args)
{
    string response;
    using (DataReader dataReader = args.GetDataReader())
    {
        response = dataReader.ReadString(dataReader.UnconsumedBufferLength).Trim();
    }

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.clientListBox.Items.Add(string.Format("client received the response: \"{0}\"", response)));

    sender.Dispose();

    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.clientListBox.Items.Add("client closed its socket"));
}

#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Networking.Sockets.h>
#include <winrt/Windows.Storage.Streams.h>
#include <winrt/Windows.UI.Core.h>
#include <winrt/Windows.UI.Xaml.Navigation.h>
#include <sstream>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::DatagramSocket m_clientDatagramSocket;
    Windows::Networking::Sockets::DatagramSocket m_serverDatagramSocket;

public:
    void OnNavigatedTo(NavigationEventArgs const& /* e */)
    {
        StartServer();
        StartClient();
    }

private:
    IAsyncAction StartServer()
    {
        try
        {
            // The ConnectionReceived event is raised when connections are received.
            m_serverDatagramSocket.MessageReceived({ this, &DatagramSocketPage::ServerDatagramSocket_MessageReceived });

            serverListBox().Items().Append(winrt::box_value(L"server is about to bind..."));

            // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
            co_await m_serverDatagramSocket.BindServiceNameAsync(L"1337");
            serverListBox().Items().Append(winrt::box_value(L"server is bound to port number 1337"));
        }
        catch (winrt::hresult_error const& ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus{ Windows::Networking::Sockets::SocketError::GetStatus(ex.to_abi()) };
            serverListBox().Items().Append(webErrorStatus != Windows::Networking::Sockets::SocketErrorStatus::Unknown ? winrt::box_value(winrt::to_hstring((int32_t)webErrorStatus)) : winrt::box_value(winrt::to_hstring(ex.to_abi())));
        }
    }

    IAsyncAction ServerDatagramSocket_MessageReceived(Windows::Networking::Sockets::DatagramSocket sender, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs args)
    {
        DataReader dataReader{ args.GetDataReader() };
        winrt::hstring request{ dataReader.ReadString(dataReader.UnconsumedBufferLength()) };

        serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
        {
            std::wstringstream wstringstream;
            wstringstream << L"server received the request: \"" << request.c_str() << L"\"";
            serverListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));
        });

        // Echo the request back as the response.
        IOutputStream outputStream = co_await sender.GetOutputStreamAsync(args.RemoteAddress(), L"1336");
        DataWriter dataWriter{ outputStream };
        dataWriter.WriteString(request);

        co_await dataWriter.StoreAsync();
        dataWriter.DetachStream();

        serverListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
        {
            std::wstringstream wstringstream;
            wstringstream << L"server sent back the response: \"" << request.c_str() << L"\"";
            serverListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));

            m_serverDatagramSocket = nullptr;

            serverListBox().Items().Append(winrt::box_value(L"server closed its socket"));
        });
    }

    IAsyncAction StartClient()
    {
        try
        {
            m_clientDatagramSocket.MessageReceived({ this, &DatagramSocketPage::ClientDatagramSocket_MessageReceived });

            // Establish a connection to the echo server.
            // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
            Windows::Networking::HostName hostName{ L"localhost" };

            clientListBox().Items().Append(winrt::box_value(L"client is about to bind..."));

            co_await m_clientDatagramSocket.BindServiceNameAsync(L"1336");
            clientListBox().Items().Append(winrt::box_value(L"client is bound to port number 1336"));

            // Send a request to the echo server.
            Windows::Networking::Sockets::DatagramSocket serverDatagramSocket;
            IOutputStream outputStream = co_await m_serverDatagramSocket.GetOutputStreamAsync(hostName, L"1337");

            winrt::hstring request{ L"Hello, World!" };
            DataWriter dataWriter{ outputStream };
            dataWriter.WriteString(request);
            co_await dataWriter.StoreAsync();
            dataWriter.DetachStream();

            std::wstringstream wstringstream;
            wstringstream << L"client sent the request: \"" << request.c_str() << L"\"";
            clientListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));
        }
        catch (winrt::hresult_error const& ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus{ Windows::Networking::Sockets::SocketError::GetStatus(ex.to_abi()) };
            serverListBox().Items().Append(webErrorStatus != Windows::Networking::Sockets::SocketErrorStatus::Unknown ? winrt::box_value(winrt::to_hstring((int32_t)webErrorStatus)) : winrt::box_value(winrt::to_hstring(ex.to_abi())));
        }
    }

    void ClientDatagramSocket_MessageReceived(Windows::Networking::Sockets::DatagramSocket const& /* sender */, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs const& args)
    {
        DataReader dataReader{ args.GetDataReader() };
        winrt::hstring response{ dataReader.ReadString(dataReader.UnconsumedBufferLength()) };
        clientListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
        {
            std::wstringstream wstringstream;
            wstringstream << L"client received the response: \"" << response.c_str() << L"\"";
            clientListBox().Items().Append(winrt::box_value(wstringstream.str().c_str()));
        });

        m_clientDatagramSocket = nullptr;

        clientListBox().Dispatcher().RunAsync(CoreDispatcherPriority::Normal, [=]()
        {
            clientListBox().Items().Append(winrt::box_value(L"client closed its socket"));
        });
    }

#include <ppltasks.h>
#include <sstream>
...
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::DatagramSocket^ clientDatagramSocket;
    Windows::Networking::Sockets::DatagramSocket^ serverDatagramSocket;

protected:
    virtual void OnNavigatedTo(NavigationEventArgs^ e) override
    {
        this->StartServer();
        this->StartClient();
    }

private:
    void StartServer()
    {
        try
        {
            this->serverDatagramSocket = ref new Windows::Networking::Sockets::DatagramSocket();

            // The ConnectionReceived event is raised when connections are received.
            this->serverDatagramSocket->MessageReceived += ref new TypedEventHandler<Windows::Networking::Sockets::DatagramSocket^, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs^>(this, &DatagramSocketPage::ServerDatagramSocket_MessageReceived);

            this->serverListBox->Items->Append(L"server is about to bind...");

            // Start listening for incoming TCP connections on the specified port. You can specify any port that's not currently in use.
            Concurrency::create_task(this->serverDatagramSocket->BindServiceNameAsync("1337")).then(
                [=]
            {
                this->serverListBox->Items->Append(L"server is bound to port number 1337");
            });
        }
        catch (Platform::Exception^ ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus = Windows::Networking::Sockets::SocketError::GetStatus(ex->HResult);
            this->serverListBox->Items->Append(webErrorStatus.ToString() != L"Unknown" ? webErrorStatus.ToString() : ex->Message);
        }
    }

    void ServerDatagramSocket_MessageReceived(Windows::Networking::Sockets::DatagramSocket^ sender, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs^ args)
    {
        DataReader^ dataReader = args->GetDataReader();
        Platform::String^ request = dataReader->ReadString(dataReader->UnconsumedBufferLength);
        this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
            [=]
        {
            std::wstringstream wstringstream;
            wstringstream << L"server received the request: \"" << request->Data() << L"\"";
            this->serverListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
        }));

        // Echo the request back as the response.
        Concurrency::create_task(sender->GetOutputStreamAsync(args->RemoteAddress, "1336")).then(
            [=](IOutputStream^ outputStream)
        {
            auto dataWriter = ref new DataWriter(outputStream);
            dataWriter->WriteString(request);
            Concurrency::create_task(dataWriter->StoreAsync()).then(
                [=](unsigned int)
            {
                dataWriter->DetachStream();

                this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
                    [=]()
                {
                    std::wstringstream wstringstream;
                    wstringstream << L"server sent back the response: \"" << request->Data() << L"\"";
                    this->serverListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));

                    delete this->serverDatagramSocket;
                    this->serverDatagramSocket = nullptr;

                    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([=]() {this->serverListBox->Items->Append(L"server closed its socket"); }));
                }));
            });
        });
    }

    void StartClient()
    {
        try
        {
            // Create the DatagramSocket and establish a connection to the echo server.
            this->clientDatagramSocket = ref new Windows::Networking::Sockets::DatagramSocket();

            this->clientDatagramSocket->MessageReceived += ref new TypedEventHandler<Windows::Networking::Sockets::DatagramSocket^, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs^>(this, &DatagramSocketPage::ClientDatagramSocket_MessageReceived);

            // The server hostname that we will be establishing a connection to. In this example, the server and client are in the same process.
            auto hostName = ref new Windows::Networking::HostName(L"localhost");

            this->clientListBox->Items->Append(L"client is about to bind...");

            Concurrency::create_task(this->clientDatagramSocket->BindServiceNameAsync("1336")).then(
                [=]
            {
                this->clientListBox->Items->Append(L"client is bound to port number 1336");
            });

            // Send a request to the echo server.
            auto serverDatagramSocket = ref new Windows::Networking::Sockets::DatagramSocket();
            Concurrency::create_task(serverDatagramSocket->GetOutputStreamAsync(hostName, "1337")).then(
                [=](IOutputStream^ outputStream)
            {
                auto request = ref new Platform::String(L"Hello, World!");
                auto dataWriter = ref new DataWriter(outputStream);
                dataWriter->WriteString(request);
                Concurrency::create_task(dataWriter->StoreAsync()).then(
                    [=](unsigned int)
                {
                    dataWriter->DetachStream();
                    std::wstringstream wstringstream;
                    wstringstream << L"client sent the request: \"" << request->Data() << L"\"";
                    this->clientListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
                });

            });
        }
        catch (Platform::Exception^ ex)
        {
            Windows::Networking::Sockets::SocketErrorStatus webErrorStatus = Windows::Networking::Sockets::SocketError::GetStatus(ex->HResult);
            this->serverListBox->Items->Append(webErrorStatus.ToString() != L"Unknown" ? webErrorStatus.ToString() : ex->Message);
        }
    }

    void ClientDatagramSocket_MessageReceived(Windows::Networking::Sockets::DatagramSocket^ sender, Windows::Networking::Sockets::DatagramSocketMessageReceivedEventArgs^ args)
    {
        DataReader^ dataReader = args->GetDataReader();
        Platform::String^ response = dataReader->ReadString(dataReader->UnconsumedBufferLength);
        this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
            [=]
        {
            std::wstringstream wstringstream;
            wstringstream << L"client received the response: \"" << response->Data() << L"\"";
            this->clientListBox->Items->Append(ref new Platform::String(wstringstream.str().c_str()));
        }));

        delete this->clientDatagramSocket;
        this->clientDatagramSocket = nullptr;

        this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([=]() {this->clientListBox->Items->Append(L"client closed its socket"); }));
    }

Operasi latar belakang dan broker soket

Anda dapat menggunakan broker soket, dan mengontrol pemicu saluran, untuk memastikan bahwa aplikasi Anda menerima koneksi atau data pada soket dengan benar saat tidak berada di latar depan. Untuk info selengkapnya, lihat Komunikasi jaringan di latar belakang.

Pengiriman batch

Setiap kali Anda menulis ke aliran yang terkait dengan soket, transisi terjadi dari mode pengguna (kode Anda) ke mode kernel (di mana tumpukan jaringan berada). Jika Anda menulis banyak buffer pada satu waktu maka transisi berulang ini bertambah menjadi overhead yang substansial. Batching pengiriman Anda adalah cara untuk mengirim beberapa buffer data bersama-sama, dan menghindari overhead itu. Ini sangat berguna jika aplikasi Anda melakukan VoIP, VPN, atau tugas lain yang melibatkan memindahkan banyak data seefisien mungkin.

Bagian ini menunjukkan beberapa teknik pengiriman batched yang dapat Anda gunakan dengan StreamSocket atau DatagramSocket yang terhubung.

Untuk mendapatkan baseline, mari kita lihat cara mengirim sejumlah besar buffer dengan cara yang tidak efisien. Berikut adalah demo minimal, menggunakan StreamSocket.

protected override async void OnNavigatedTo(NavigationEventArgs e)
{
    var streamSocketListener = new Windows.Networking.Sockets.StreamSocketListener();
    streamSocketListener.ConnectionReceived += this.StreamSocketListener_ConnectionReceived;
    await streamSocketListener.BindServiceNameAsync("1337");

    var streamSocket = new Windows.Networking.Sockets.StreamSocket();
    await streamSocket.ConnectAsync(new Windows.Networking.HostName("localhost"), "1337");
    this.SendMultipleBuffersInefficiently(streamSocket, "Hello, World!");
    //this.BatchedSendsCSharpOnly(streamSocket, "Hello, World!");
    //this.BatchedSendsAnyUWPLanguage(streamSocket, "Hello, World!");
}

private async void StreamSocketListener_ConnectionReceived(Windows.Networking.Sockets.StreamSocketListener sender, Windows.Networking.Sockets.StreamSocketListenerConnectionReceivedEventArgs args)
{
    using (var dataReader = new DataReader(args.Socket.InputStream))
    {
        dataReader.InputStreamOptions = InputStreamOptions.Partial;
        while (true)
        {
            await dataReader.LoadAsync(256);
            if (dataReader.UnconsumedBufferLength == 0) break;
            IBuffer requestBuffer = dataReader.ReadBuffer(dataReader.UnconsumedBufferLength);
            string request = Windows.Security.Cryptography.CryptographicBuffer.ConvertBinaryToString(Windows.Security.Cryptography.BinaryStringEncoding.Utf8, requestBuffer);
            Debug.WriteLine(string.Format("server received the request: \"{0}\"", request));
        }
    }
}

// This implementation incurs kernel transition overhead for each packet written.
private async void SendMultipleBuffersInefficiently(Windows.Networking.Sockets.StreamSocket streamSocket, string message)
{
    var packetsToSend = new List<IBuffer>();
    for (int count = 0; count < 5; ++count) { packetsToSend.Add(Windows.Security.Cryptography.CryptographicBuffer.ConvertStringToBinary(message, Windows.Security.Cryptography.BinaryStringEncoding.Utf8)); }

    foreach (IBuffer packet in packetsToSend)
    {
        await streamSocket.OutputStream.WriteAsync(packet);
    }
}

#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Networking.Sockets.h>
#include <winrt/Windows.Security.Cryptography.h>
#include <winrt/Windows.Storage.Streams.h>
#include <winrt/Windows.UI.Core.h>
#include <winrt/Windows.UI.Xaml.Navigation.h>
#include <sstream>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::StreamSocketListener m_streamSocketListener;
    Windows::Networking::Sockets::StreamSocket m_streamSocket;

public:
    IAsyncAction OnNavigatedTo(NavigationEventArgs /* e */)
    {
        m_streamSocketListener.ConnectionReceived({ this, &BatchedSendsPage::OnConnectionReceived });
        co_await m_streamSocketListener.BindServiceNameAsync(L"1337");

        co_await m_streamSocket.ConnectAsync(Windows::Networking::HostName{ L"localhost" }, L"1337");
        SendMultipleBuffersInefficientlyAsync(L"Hello, World!");
        //BatchedSendsAnyUWPLanguageAsync(L"Hello, World!");
    }

private:
    IAsyncAction OnConnectionReceived(Windows::Networking::Sockets::StreamSocketListener const& /* sender */, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs const& args)
    {
        DataReader dataReader{ args.Socket().InputStream() };
        dataReader.InputStreamOptions(Windows::Storage::Streams::InputStreamOptions::Partial);

        while (true)
        {
            unsigned int bytesLoaded = co_await dataReader.LoadAsync(256);
            if (bytesLoaded == 0) break;
            winrt::hstring message{ dataReader.ReadString(bytesLoaded) };
            ::OutputDebugString(message.c_str());
        }
    }

    // This implementation incurs kernel transition overhead for each packet written.
    IAsyncAction SendMultipleBuffersInefficientlyAsync(winrt::hstring message)
    {
        co_await winrt::resume_background();

        std::vector< IBuffer > packetsToSend;
        for (unsigned int count = 0; count < 5; ++count)
        {
            packetsToSend.push_back(Windows::Security::Cryptography::CryptographicBuffer::ConvertStringToBinary(message, Windows::Security::Cryptography::BinaryStringEncoding::Utf8));
        }

        for (auto const& element : packetsToSend)
        {
            m_streamSocket.OutputStream().WriteAsync(element).get();
        }
    }

#include <ppltasks.h>
#include <sstream>
...
using namespace Windows::Foundation;
using namespace Windows::Storage::Streams;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Navigation;
...
private:
    Windows::Networking::Sockets::StreamSocketListener^ streamSocketListener;
    Windows::Networking::Sockets::StreamSocket^ streamSocket;

protected:
    virtual void OnNavigatedTo(NavigationEventArgs^ e) override
    {
        this->streamSocketListener = ref new Windows::Networking::Sockets::StreamSocketListener();
        streamSocketListener->ConnectionReceived += ref new TypedEventHandler<Windows::Networking::Sockets::StreamSocketListener^, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^>(this, &BatchedSendsPage::StreamSocketListener_ConnectionReceived);
        Concurrency::create_task(this->streamSocketListener->BindServiceNameAsync(L"1337")).then(
            [=]
        {
            this->streamSocket = ref new Windows::Networking::Sockets::StreamSocket();
            Concurrency::create_task(this->streamSocket->ConnectAsync(ref new Windows::Networking::HostName(L"localhost"), L"1337")).then(
                [=](Concurrency::task< void >)
            {
                this->SendMultipleBuffersInefficiently(L"Hello, World!");
                // this->BatchedSendsAnyUWPLanguage(L"Hello, World!");
            }, Concurrency::task_continuation_context::use_synchronous_execution());
        });
    }

private:
    void StreamSocketListener_ConnectionReceived(Windows::Networking::Sockets::StreamSocketListener^ sender, Windows::Networking::Sockets::StreamSocketListenerConnectionReceivedEventArgs^ args)
    {
        auto dataReader = ref new DataReader(args->Socket->InputStream);
        dataReader->InputStreamOptions = Windows::Storage::Streams::InputStreamOptions::Partial;
        this->ReceiveStringRecurse(dataReader, args->Socket);
    }

    void ReceiveStringRecurse(DataReader^ dataReader, Windows::Networking::Sockets::StreamSocket^ streamSocket)
    {
        Concurrency::create_task(dataReader->LoadAsync(256)).then(
            [this, dataReader, streamSocket](unsigned int bytesLoaded)
        {
            if (bytesLoaded == 0) return;
            Platform::String^ message = dataReader->ReadString(bytesLoaded);
            ::OutputDebugString(message->Data());
            this->ReceiveStringRecurse(dataReader, streamSocket);
        });
    }

    // This implementation incurs kernel transition overhead for each packet written.
    void SendMultipleBuffersInefficiently(Platform::String^ message)
    {
        std::vector< IBuffer^ > packetsToSend{};
        for (unsigned int count = 0; count < 5; ++count)
        {
            packetsToSend.push_back(Windows::Security::Cryptography::CryptographicBuffer::ConvertStringToBinary(message, Windows::Security::Cryptography::BinaryStringEncoding::Utf8));
        }

        for (auto element : packetsToSend)
        {
            Concurrency::create_task(this->streamSocket->OutputStream->WriteAsync(element)).wait();
        }
    }

Contoh pertama dari teknik yang lebih efisien ini hanya sesuai jika Anda menggunakan C #. Ubah OnNavigatedTo untuk menelepon BatchedSendsCSharpOnly alih-alih SendMultipleBuffersInefficiently atau SendMultipleBuffersInefficientlyAsync.

// A C#-only technique for batched sends.
private async void BatchedSendsCSharpOnly(Windows.Networking.Sockets.StreamSocket streamSocket, string message)
{
    var packetsToSend = new List<IBuffer>();
    for (int count = 0; count < 5; ++count) { packetsToSend.Add(Windows.Security.Cryptography.CryptographicBuffer.ConvertStringToBinary(message, Windows.Security.Cryptography.BinaryStringEncoding.Utf8)); }

    var pendingTasks = new System.Threading.Tasks.Task[packetsToSend.Count];

    for (int index = 0; index < packetsToSend.Count; ++index)
    {
        // track all pending writes as tasks, but don't wait on one before beginning the next.
        pendingTasks[index] = streamSocket.OutputStream.WriteAsync(packetsToSend[index]).AsTask();
        // Don't modify any buffer's contents until the pending writes are complete.
    }

    // Wait for all of the pending writes to complete.
    System.Threading.Tasks.Task.WaitAll(pendingTasks);
}

Contoh berikutnya ini sesuai untuk bahasa UWP apa pun, bukan hanya untuk C #. Ini bergantung pada perilaku di StreamSocket.OutputStream dan DatagramSocket.OutputStream yang dikirim bersama oleh batch. Teknik ini memanggil FlushAsync pada aliran output yang, pada Windows 10, dijamin akan kembali hanya setelah semua operasi pada aliran output selesai.

// An implementation of batched sends suitable for any UWP language.
private async void BatchedSendsAnyUWPLanguage(Windows.Networking.Sockets.StreamSocket streamSocket, string message)
{
    var packetsToSend = new List<IBuffer>();
    for (int count = 0; count < 5; ++count) { packetsToSend.Add(Windows.Security.Cryptography.CryptographicBuffer.ConvertStringToBinary(message, Windows.Security.Cryptography.BinaryStringEncoding.Utf8)); }

    var pendingWrites = new IAsyncOperationWithProgress<uint, uint>[packetsToSend.Count];

    for (int index = 0; index < packetsToSend.Count; ++index)
    {
        // track all pending writes as tasks, but don't wait on one before beginning the next.
        pendingWrites[index] = streamSocket.OutputStream.WriteAsync(packetsToSend[index]);
        // Don't modify any buffer's contents until the pending writes are complete.
    }

    // Wait for all of the pending writes to complete. This step enables batched sends on the output stream.
    await streamSocket.OutputStream.FlushAsync();
}

// An implementation of batched sends suitable for any UWP language.
IAsyncAction BatchedSendsAnyUWPLanguageAsync(winrt::hstring message)
{
    std::vector< IBuffer > packetsToSend{};
    std::vector< IAsyncOperationWithProgress< unsigned int, unsigned int > > pendingWrites{};
    for (unsigned int count = 0; count < 5; ++count)
    {
        packetsToSend.push_back(Windows::Security::Cryptography::CryptographicBuffer::ConvertStringToBinary(message, Windows::Security::Cryptography::BinaryStringEncoding::Utf8));
    }

    for (auto const& element : packetsToSend)
    {
        // track all pending writes as tasks, but don't wait on one before beginning the next.
        pendingWrites.push_back(m_streamSocket.OutputStream().WriteAsync(element));
        // Don't modify any buffer's contents until the pending writes are complete.
    }

    // Wait for all of the pending writes to complete. This step enables batched sends on the output stream.
    co_await m_streamSocket.OutputStream().FlushAsync();
}

private:
    // An implementation of batched sends suitable for any UWP language.
    void BatchedSendsAnyUWPLanguage(Platform::String^ message)
    {
        std::vector< IBuffer^ > packetsToSend{};
        std::vector< IAsyncOperationWithProgress< unsigned int, unsigned int >^ >pendingWrites{};
        for (unsigned int count = 0; count < 5; ++count)
        {
            packetsToSend.push_back(Windows::Security::Cryptography::CryptographicBuffer::ConvertStringToBinary(message, Windows::Security::Cryptography::BinaryStringEncoding::Utf8));
        }

        for (auto element : packetsToSend)
        {
            // track all pending writes as tasks, but don't wait on one before beginning the next.
            pendingWrites.push_back(this->streamSocket->OutputStream->WriteAsync(element));
            // Don't modify any buffer's contents until the pending writes are complete.
        }

        // Wait for all of the pending writes to complete. This step enables batched sends on the output stream.
        Concurrency::create_task(this->streamSocket->OutputStream->FlushAsync());
    }

Ada beberapa batasan penting yang diberlakukan dengan menggunakan pengiriman batched dalam kode Anda.

• Anda tidak dapat mengubah konten instans IBuffer yang ditulis hingga penulisan asinkron selesai.
• Pola FlushAsync hanya berfungsi di StreamSocket.OutputStream dan DatagramSocket.OutputStream.
• Pola FlushAsync hanya berfungsi dalam Windows 10 dan seterusnya.
• Dalam kasus lain, gunakan Task.WaitAll alih-alih pola FlushAsync .

Berbagi port untuk DatagramSocket

Anda dapat mengonfigurasi DatagramSocket untuk hidup berdampingan dengan soket multicast Win32 atau UWP lainnya yang terikat pada alamat/port yang sama. Anda melakukan ini dengan mengatur DatagramSocketControl.MulticastOnlytrue sebelum mengikat atau menghubungkan soket. Anda mengakses instance DatagramSocketControl dari objek DatagramSocket itu sendiri melalui properti DatagramSocket.Control-nya .

Memberikan sertifikat klien dengan kelas StreamSocket

StreamSocket mendukung penggunaan SSL/TLS untuk mengautentikasi server yang sedang dibicarakan oleh aplikasi klien. Dalam beberapa kasus, aplikasi klien perlu mengautentikasi dirinya ke server menggunakan sertifikat klien SSL / TLS. Anda dapat memberikan sertifikat klien dengan properti StreamSocketControl.ClientCertificate sebelum mengikat atau menghubungkan soket (harus diatur sebelum jabat tangan SSL/TLS dimulai). Anda mengakses instance StreamSocketControl dari objek StreamSocket itu sendiri melalui properti StreamSocket.Control-nya . Jika server meminta sertifikat klien maka Windows akan merespons dengan sertifikat klien yang Anda berikan.

Gunakan penimpaan StreamSocket.ConnectAsync yang mengambil SocketProtectionLevel, seperti yang ditunjukkan dalam contoh kode minimal ini.

Penting

Seperti yang ditunjukkan oleh komentar dalam contoh kode di bawah ini, proyek Anda perlu mendeklarasikan kemampuan aplikasi sharedUserCertificates agar kode ini berfungsi.

// For this code to work, you need at least one certificate to be present in the user MY certificate store.
// Plugging a smartcard into a smartcard reader connected to your PC will achieve that.
// Also, your project needs to declare the sharedUserCertificates app capability.
var certificateQuery = new Windows.Security.Cryptography.Certificates.CertificateQuery();
certificateQuery.StoreName = "MY";
IReadOnlyList<Windows.Security.Cryptography.Certificates.Certificate> certificates = await Windows.Security.Cryptography.Certificates.CertificateStores.FindAllAsync(certificateQuery);
if (certificates.Count > 0)
{
    streamSocket.Control.ClientCertificate = certificates[0];
    await streamSocket.ConnectAsync(hostName, "1337", Windows.Networking.Sockets.SocketProtectionLevel.Tls12);
}

// For this code to work, you need at least one certificate to be present in the user MY certificate store.
// Plugging a smartcard into a smartcard reader connected to your PC will achieve that.
// Also, your project needs to declare the sharedUserCertificates app capability.
Windows::Security::Cryptography::Certificates::CertificateQuery certificateQuery;
certificateQuery.StoreName(L"MY");
IVectorView< Windows::Security::Cryptography::Certificates::Certificate > certificates = co_await Windows::Security::Cryptography::Certificates::CertificateStores::FindAllAsync(certificateQuery);

if (certificates.Size() > 0)
{
    m_streamSocket.Control().ClientCertificate(certificates.GetAt(0));
    co_await m_streamSocket.ConnectAsync(Windows::Networking::HostName{ L"localhost" }, L"1337", Windows::Networking::Sockets::SocketProtectionLevel::Tls12);
    ...
}

// For this code to work, you need at least one certificate to be present in the user MY certificate store.
// Plugging a smartcard into a smartcard reader connected to your PC will achieve that.
// Also, your project needs to declare the sharedUserCertificates app capability.
auto certificateQuery = ref new Windows::Security::Cryptography::Certificates::CertificateQuery();
certificateQuery->StoreName = L"MY";
Concurrency::create_task(Windows::Security::Cryptography::Certificates::CertificateStores::FindAllAsync(certificateQuery)).then(
    [=](IVectorView< Windows::Security::Cryptography::Certificates::Certificate^ >^ certificates)
{
    if (certificates->Size > 0)
    {
        this->streamSocket->Control->ClientCertificate = certificates->GetAt(0);
        Concurrency::create_task(this->streamSocket->ConnectAsync(ref new Windows::Networking::HostName(L"localhost"), L"1337", Windows::Networking::Sockets::SocketProtectionLevel::Tls12)).then(
            [=]
        {
            ...
        });
    }
});

Menangani pengecualian

Kesalahan yang ditemui pada operasi DatagramSocket, StreamSocket, atau StreamSocketListener dikembalikan sebagai nilai HRESULT . Anda dapat meneruskan nilai HRESULT itu ke metode SocketError.GetStatus untuk mengubahnya menjadi nilai pencacahan SocketErrorStatus .

Sebagian besar nilai pencacahan SocketErrorStatus sesuai dengan kesalahan yang dikembalikan oleh operasi soket Windows asli. Aplikasi Anda dapat mengaktifkan nilai pencacahan SocketErrorStatus untuk mengubah perilaku aplikasi tergantung pada penyebab pengecualian.

Untuk kesalahan validasi parameter, Anda dapat menggunakan HRESULT dari pengecualian untuk mempelajari informasi lebih rinci tentang kesalahan. Kemungkinan nilai HRESULT tercantum dalam Winerror.h, yang dapat ditemukan di instalasi SDK Anda (misalnya, di folder C:\Program Files (x86)\Windows Kits\10\Include\<VERSION>\shared). Untuk sebagian besar kesalahan validasi parameter, HRESULT yang dikembalikan E_INVALIDARG.

Konstruktor HostName dapat memberikan pengecualian jika string yang dilewati bukan nama host yang valid. Misalnya, ini berisi karakter yang tidak diizinkan, yang kemungkinan jika nama host diketik ke aplikasi Anda oleh pengguna. Buat HostName di dalam blok coba/tangkap. Dengan begitu, jika pengecualian dilemparkan, aplikasi dapat memberi tahu pengguna dan meminta nama host baru.

API Penting

• CertificateQuery
• CertificateStores.FindAllAsync
• DatagramSocket
• Datagramsocket.BindServiceNameasync
• Datagramsocket.Control
• Datagramsocket.GetOutputStreamasync
• DatagramSocket.MessageReceived
• DatagramSocketControl.MulticastOnly
• DatagramSocketMessageReceivedEventArgs
• DatagramSocketMessageReceivedEventArgs.GetDataReader
• DataReader.LoadAsync
• IOutputStream.flushasync
• SocketError.GetStatus
• SocketErrorStatus
• SocketProtectionLevel
• StreamSocket
• StreamSocketControl.ClientCertificate
• StreamSocket.connectasync
• StreamSocket.InputStream
• StreamSocket.OutputStream
• StreamSocketListener
• StreamSocketListener.BindServiceNameasync
• StreamSocketListener.ConnectionReceived
• StreamSocketListenerConnectionReceivedEventArgs
• Windows. Jaringan.Soket

Topik terkait

• Komunikasi aplikasi-ke-aplikasi
• Operasi konkurensi dan asinkron dengan C++/WinRT
• Cara mengatur kemampuan jaringan
• soket Windows 2 (Winsock)

Sampel

• Sampel StreamSocket