C#处理标准输出延迟

Question

从 C# 表单我是运行 a process with start info similar to Redirect console output to textbox in separate program and C# get process output while running, the process runs correctly however the output takes a long time to appear in the DataReceived event.

我想在进程生成文本后立即看到它；根据 Process standard output cannot be captured?（第一条评论），我需要等到 2 到 4 kb 的缓冲区填充后才能触发事件。

根据要求，这是代码：

void pcs_OutputDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e)
{
    if (!string.IsNullOrEmpty(e.Data)) 
        textBox1.BeginInvoke((Action)delegate { textBox1.AppendText(text + "\n"); });
}

private void LER_Go_Click(object sender, EventArgs e)
{
    // variables LiDARExtRep contains the full path to an executable file
    // that runs in DOS and produces verbose output.
    // LER_Path.Text is the parameter passed to LiDARExtRep (only one arg for this example)
    ProcessStartInfo pStartInfo = new ProcessStartInfo(LiDARExtRep, LER_Path.Text);    
    pStartInfo.UseShellExecute = false;
    pStartInfo.ErrorDialog = false;
    pStartInfo.RedirectStandardError = true;
    pStartInfo.RedirectStandardInput = true;
    pStartInfo.RedirectStandardOutput = true;
    pStartInfo.CreateNoWindow = true;

    System.Diagnostics.Process pcs = new System.Diagnostics.Process();
    pcs.StartInfo = pStartInfo;

    bool pStarted = pcs.Start();

    pcs.OutputDataReceived += new DataReceivedEventHandler(pcs_OutputDataReceived);

    pcs.BeginOutputReadLine();
    pcs.WaitForExit();
}

我看不出它有什么特别之处，它与我引用的示例完全相同...构造函数中的简单 "Dir","/b/s" 应该会产生相同的结果。

有没有办法将缓冲区减少到几个字节，或者有更好的方法来执行命令行工具并接收输出 'real time'？

背景：我用C++写了一些命令行程序，效果很好很好，但年轻一代似乎害怕DOS，所以我正在创建一个表单（GUI）收集这些工具的参数，因为它似乎比尝试在 C++ 中的每个程序上放置一个 GUI 少很多工作。如果我无法获得实时响应，我将不得不 UseShellExecute = true; 并显示命令 window.

Answer 1

缓冲发生在控制台程序结束时。默认情况下，如果已知要重定向，stdout 将完全缓冲：

If stdout is known to not refer to an interactive device, the stream is fully buffered. Otherwise, it is library-dependent whether the stream is line buffered or not buffered by default (see setvbuf). Source

因此，除非您可以更改控制台程序源以禁用缓冲，否则在 GUI 程序端什么也做不了。

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