Process.OutputDataReceived Kejadian

Definisi

Ruang nama:

System.Diagnostics

Rakitan:

System.Diagnostics.Process.dll

Sumber:

Process.cs

Terjadi setiap kali aplikasi menulis baris ke aliran yang dialihkan StandardOutput .

public:
 event System::Diagnostics::DataReceivedEventHandler ^ OutputDataReceived;

public event System.Diagnostics.DataReceivedEventHandler? OutputDataReceived;

member this.OutputDataReceived : System.Diagnostics.DataReceivedEventHandler 

Public Custom Event OutputDataReceived As DataReceivedEventHandler 

Jenis Acara

DataReceivedEventHandler

Contoh

Contoh berikut menggambarkan cara melakukan operasi baca asinkron pada aliran perintah yang ipconfig dialihkanStandardOutput.

Contoh membuat delegasi peristiwa untuk OutputHandler penanganan aktivitas dan mengaitkannya dengan OutputDataReceived peristiwa. Penanganan aktivitas menerima baris teks dari aliran yang dialihkan StandardOutput , memformat teks, dan menyimpannya dalam string output yang kemudian ditampilkan di jendela konsol contoh.

using namespace System;
using namespace System::IO;
using namespace System::Diagnostics;
using namespace System::Text;

ref class StandardAsyncOutputExample
{
private:
    static int lineCount = 0;
    static StringBuilder^ output = nullptr;

public:
    static void Run()
    {
        Process^ process = gcnew Process();
        process->StartInfo->FileName = "ipconfig.exe";
        process->StartInfo->UseShellExecute = false;
        process->StartInfo->RedirectStandardOutput = true;
        output = gcnew StringBuilder();
        process->OutputDataReceived += gcnew DataReceivedEventHandler(OutputHandler);
        process->Start();

        // Asynchronously read the standard output of the spawned process. 
        // This raises OutputDataReceived events for each line of output.
        process->BeginOutputReadLine();
        process->WaitForExit();

        // Write the redirected output to this application's window.
        Console::WriteLine(output);

        process->WaitForExit();
        process->Close();

        Console::WriteLine("\n\nPress any key to exit");
        Console::ReadLine();
    }

private:
    static void OutputHandler(Object^ sender, DataReceivedEventArgs^ e)
    {
        // Prepend line numbers to each line of the output.
        if (!String::IsNullOrEmpty(e->Data))
        {
            lineCount++;
            output->Append("\n[" + lineCount + "]: " + e->Data);
        }
    }
};

int main()
{
    StandardAsyncOutputExample::Run();
}

using System;
using System.IO;
using System.Diagnostics;
using System.Text;

class StandardAsyncOutputExample
{
    private static int lineCount = 0;
    private static StringBuilder output = new StringBuilder();

    public static void Main()
    {
        Process process = new Process();
        process.StartInfo.FileName = "ipconfig.exe";
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
        {
            // Prepend line numbers to each line of the output.
            if (!String.IsNullOrEmpty(e.Data))
            {
                lineCount++;
                output.Append("\n[" + lineCount + "]: " + e.Data);
            }
        });

        process.Start();

        // Asynchronously read the standard output of the spawned process.
        // This raises OutputDataReceived events for each line of output.
        process.BeginOutputReadLine();
        process.WaitForExit();

        // Write the redirected output to this application's window.
        Console.WriteLine(output);

        process.WaitForExit();
        process.Close();

        Console.WriteLine("\n\nPress any key to exit.");
        Console.ReadLine();
    }
}

Imports System.IO
Imports System.Diagnostics
Imports System.Text

Module Module1
    Dim lineCount As Integer = 0
    Dim output As StringBuilder = New StringBuilder()

    Sub Main()
        Dim process As New Process()
        process.StartInfo.FileName = "ipconfig.exe"
        process.StartInfo.UseShellExecute = False
        process.StartInfo.RedirectStandardOutput = True
        AddHandler process.OutputDataReceived, AddressOf OutputHandler
        process.Start()

        ' Asynchronously read the standard output of the spawned process. 
        ' This raises OutputDataReceived events for each line of output.
        process.BeginOutputReadLine()
        process.WaitForExit()

        Console.WriteLine(output)

        process.WaitForExit()
        process.Close()

        Console.WriteLine(Environment.NewLine + Environment.NewLine + "Press any key to exit.")
        Console.ReadLine()
    End Sub

    Sub OutputHandler(sender As Object, e As DataReceivedEventArgs)
        If Not String.IsNullOrEmpty(e.Data) Then
            lineCount += 1

            ' Add the text to the collected output.
            output.Append(Environment.NewLine + "[" + lineCount.ToString() + "]: " + e.Data)
        End If
    End Sub
End Module

Keterangan

Peristiwa menunjukkan OutputDataReceived bahwa yang terkait Process telah menulis baris yang dihentikan dengan baris baru (carriage return (CR), line feed (LF), atau CR+LF) ke aliran yang dialihkan StandardOutput .

Peristiwa diaktifkan selama operasi baca asinkron pada StandardOutput. Untuk memulai operasi baca asinkron, Anda harus mengalihkan StandardOutput aliran Process, tambahkan penanganan aktivitas Anda ke OutputDataReceived peristiwa, dan panggil BeginOutputReadLine. Setelah itu, peristiwa memberi OutputDataReceived sinyal setiap kali proses menulis garis ke aliran yang dialihkan StandardOutput , sampai proses keluar atau memanggil CancelOutputRead.

Catatan

Aplikasi yang memproses output asinkron harus memanggil WaitForExit metode untuk memastikan bahwa buffer output telah dibersihkan.

Lihat juga

• RedirectStandardOutput
• StandardOutput
• BeginOutputReadLine()
• CancelOutputRead()
• DataReceivedEventHandler