Gör så här: Använda anonyma pipes för lokal kommunikation mellan processer

Anonyma rör tillhandahåller kommunikation mellan processer på en lokal dator. De erbjuder mindre funktioner än namngivna rör, men kräver också mindre omkostnader. Du kan använda anonyma rör för att underlätta kommunikation mellan processer på en lokal dator. Du kan inte använda anonyma rör för kommunikation via ett nätverk.

Använd klasserna AnonymousPipeServerStream och AnonymousPipeClientStream för att implementera anonyma rör.

Exempel 1

I följande exempel visas ett sätt att skicka en sträng från en överordnad process till en underordnad process med hjälp av anonyma pipes. Det här exemplet skapar ett AnonymousPipeServerStream objekt i en överordnad process med värdet PipeDirectionOut. Den överordnade processen skapar sedan en underordnad process med hjälp av ett klienthandtag för att skapa ett AnonymousPipeClientStream objekt. Den underordnade processen har värdet PipeDirectionIn.

Den överordnade processen skickar sedan en användarangiven sträng till den underordnade processen. Strängen visas i konsolen i den underordnade processen.

I följande exempel visas serverprocessen.

#using <System.dll>
#using <System.Core.dll>

using namespace System;
using namespace System::IO;
using namespace System::IO::Pipes;
using namespace System::Diagnostics;

ref class PipeServer
{
public:
    static void Main()
    {
        Process^ pipeClient = gcnew Process();

        pipeClient->StartInfo->FileName = "pipeClient.exe";

        AnonymousPipeServerStream^ pipeServer =
            gcnew AnonymousPipeServerStream(PipeDirection::Out,
            HandleInheritability::Inheritable);

        Console::WriteLine("[SERVER] Current TransmissionMode: {0}.",
            pipeServer->TransmissionMode);

        // Pass the client process a handle to the server.
        pipeClient->StartInfo->Arguments =
            pipeServer->GetClientHandleAsString();
        pipeClient->StartInfo->UseShellExecute = false;
        pipeClient->Start();

        pipeServer->DisposeLocalCopyOfClientHandle();

        try
        {
            // Read user input and send that to the client process.
            StreamWriter^ sw = gcnew StreamWriter(pipeServer);

            sw->AutoFlush = true;
            // Send a 'sync message' and wait for client to receive it.
            sw->WriteLine("SYNC");
            pipeServer->WaitForPipeDrain();
            // Send the console input to the client process.
            Console::Write("[SERVER] Enter text: ");
            sw->WriteLine(Console::ReadLine());
            sw->Close();
        }
        // Catch the IOException that is raised if the pipe is broken
        // or disconnected.
        catch (IOException^ e)
        {
            Console::WriteLine("[SERVER] Error: {0}", e->Message);
        }
        pipeServer->Close();
        pipeClient->WaitForExit();
        pipeClient->Close();
        Console::WriteLine("[SERVER] Client quit. Server terminating.");
    }
};

int main()
{
    PipeServer::Main();
}

using System;
using System.IO;
using System.IO.Pipes;
using System.Diagnostics;

class PipeServer
{
    static void Main()
    {
        Process pipeClient = new Process();

        pipeClient.StartInfo.FileName = "pipeClient.exe";

        using (AnonymousPipeServerStream pipeServer =
            new AnonymousPipeServerStream(PipeDirection.Out,
            HandleInheritability.Inheritable))
        {
            Console.WriteLine("[SERVER] Current TransmissionMode: {0}.",
                pipeServer.TransmissionMode);

            // Pass the client process a handle to the server.
            pipeClient.StartInfo.Arguments =
                pipeServer.GetClientHandleAsString();
            pipeClient.StartInfo.UseShellExecute = false;
            pipeClient.Start();

            pipeServer.DisposeLocalCopyOfClientHandle();

            try
            {
                // Read user input and send that to the client process.
                using (StreamWriter sw = new StreamWriter(pipeServer))
                {
                    sw.AutoFlush = true;
                    // Send a 'sync message' and wait for client to receive it.
                    sw.WriteLine("SYNC");
                    pipeServer.WaitForPipeDrain();
                    // Send the console input to the client process.
                    Console.Write("[SERVER] Enter text: ");
                    sw.WriteLine(Console.ReadLine());
                }
            }
            // Catch the IOException that is raised if the pipe is broken
            // or disconnected.
            catch (IOException e)
            {
                Console.WriteLine("[SERVER] Error: {0}", e.Message);
            }
        }

        pipeClient.WaitForExit();
        pipeClient.Close();
        Console.WriteLine("[SERVER] Client quit. Server terminating.");
    }
}

Imports System.IO
Imports System.IO.Pipes
Imports System.Diagnostics

Class PipeServer
    Shared Sub Main()
        Dim pipeClient As New Process()

        pipeClient.StartInfo.FileName = "pipeClient.exe"

        Using pipeServer As New AnonymousPipeServerStream(PipeDirection.Out, _
            HandleInheritability.Inheritable)

            Console.WriteLine("[SERVER] Current TransmissionMode: {0}.",
                pipeServer.TransmissionMode)

            ' Pass the client process a handle to the server.
            pipeClient.StartInfo.Arguments = pipeServer.GetClientHandleAsString()
            pipeClient.StartInfo.UseShellExecute = false
            pipeClient.Start()

            pipeServer.DisposeLocalCopyOfClientHandle()

            Try
                ' Read user input and send that to the client process.
                Using sw As New StreamWriter(pipeServer)
                    sw.AutoFlush = true
                    ' Send a 'sync message' and wait for client to receive it.
                    sw.WriteLine("SYNC")
                    pipeServer.WaitForPipeDrain()
                    ' Send the console input to the client process.
                    Console.Write("[SERVER] Enter text: ")
                    sw.WriteLine(Console.ReadLine())
                End Using
            Catch e As IOException
                ' Catch the IOException that is raised if the pipe is broken
                ' or disconnected.
                Console.WriteLine("[SERVER] Error: {0}", e.Message)
            End Try
        End Using

        pipeClient.WaitForExit()
        pipeClient.Close()
        Console.WriteLine("[SERVER] Client quit. Server terminating.")
    End Sub
End Class

Exempel 2

I följande exempel visas klientprocessen. Serverprocessen startar klientprocessen och ger den processen ett klienthandtag. Den resulterande körbara filen från klientkoden ska namnges pipeClient.exe och kopieras till samma katalog som den körbara servern innan serverprocessen körs.

#using <System.Core.dll>

using namespace System;
using namespace System::IO;
using namespace System::IO::Pipes;

ref class PipeClient
{
public:
    static void Main(array<String^>^ args)
    {
        if (args->Length > 1)
        {
            PipeStream^ pipeClient = gcnew AnonymousPipeClientStream(PipeDirection::In, args[1]);

            Console::WriteLine("[CLIENT] Current TransmissionMode: {0}.",
                pipeClient->TransmissionMode);

            StreamReader^ sr = gcnew StreamReader(pipeClient);

            // Display the read text to the console
            String^ temp;

            // Wait for 'sync message' from the server.
            do
            {
                Console::WriteLine("[CLIENT] Wait for sync...");
                temp = sr->ReadLine();
            }
            while (!temp->StartsWith("SYNC"));

            // Read the server data and echo to the console.
            while ((temp = sr->ReadLine()) != nullptr)
            {
                Console::WriteLine("[CLIENT] Echo: " + temp);
            }
            sr->Close();
            pipeClient->Close();
        }
        Console::Write("[CLIENT] Press Enter to continue...");
        Console::ReadLine();
    }
};

int main()
{
    array<String^>^ args = Environment::GetCommandLineArgs();
    PipeClient::Main(args);
}

using System;
using System.IO;
using System.IO.Pipes;

class PipeClient
{
    static void Main(string[] args)
    {
        if (args.Length > 0)
        {
            using (PipeStream pipeClient =
                new AnonymousPipeClientStream(PipeDirection.In, args[0]))
            {
                Console.WriteLine("[CLIENT] Current TransmissionMode: {0}.",
                   pipeClient.TransmissionMode);

                using (StreamReader sr = new StreamReader(pipeClient))
                {
                    // Display the read text to the console
                    string temp;

                    // Wait for 'sync message' from the server.
                    do
                    {
                        Console.WriteLine("[CLIENT] Wait for sync...");
                        temp = sr.ReadLine();
                    }
                    while (!temp.StartsWith("SYNC"));

                    // Read the server data and echo to the console.
                    while ((temp = sr.ReadLine()) != null)
                    {
                        Console.WriteLine("[CLIENT] Echo: " + temp);
                    }
                }
            }
        }
        Console.Write("[CLIENT] Press Enter to continue...");
        Console.ReadLine();
    }
}

Imports System.IO
Imports System.IO.Pipes

Class PipeClient
    Shared Sub Main(args() as String)
        If args.Length > 0 Then
            Using pipeClient As New AnonymousPipeClientStream(PipeDirection.In, args(0))
                Console.WriteLine("[CLIENT] Current TransmissionMode: {0}.", _
                   pipeClient.TransmissionMode)

                Using sr As New StreamReader(pipeClient)
                    ' Display the read text to the console
                    Dim temp As String

                    ' Wait for 'sync message' from the server.
                    Do
                        Console.WriteLine("[CLIENT] Wait for sync...")
                        temp = sr.ReadLine()
                    Loop While temp.StartsWith("SYNC") = False

                    ' Read the server data and echo to the console.
                    temp = sr.ReadLine()
                    While Not temp = Nothing
                        Console.WriteLine("[CLIENT] Echo: " + temp)
                        temp = sr.ReadLine()
                    End While
                End Using
            End Using
        End If
        Console.Write("[CLIENT] Press Enter to continue...")
        Console.ReadLine()
    End Sub
End Class

Se även

• Rör
• Gör så här: Använda namngivna pipes för kommunikation mellan nätverk