如何通过输入流手动向cmd.exe进程提供命令

这个问题听起来有点晦涩。下面是稍微长一点的版本:

我需要让主循环等待用户输入，还需要运行一个进程，等待来自用户输入要发送到的流的输入。

完整的故事:我正在构建一个Cmd模拟器，起初一切看起来都很好:用户输入一个命令，它被回显到输出区域，处理和StdOut和StdErrOut被捕获，并添加到输出文本框。

唯一的问题是，由于cmd进程是为每个命令单独创建和启动的，因此没有保留任何状态。不包括变量、代码页和工作目录等。

所以我决定发明一个小技巧:输入左括号或右括号开始和停止收集命令，而不是执行它们。在右括号之后，processBatch方法中使用命令列表('batch')将它们全部提供给cmd进程，以查看其重定向输入。工作得很好。

唯一的问题是，很明显，现在我得到了状态，但失去了即时响应，所以任何错误都不会弹出，直到运行批处理。

所以我决定把好的部分结合起来，嗯，当我意识到要保持两个循环工作时，我知道我会遇到麻烦。等待，我必须使用线程。这是我多年没做过的事了。

在布局中，我选择main()循环等待用户输入，startCMDtask()在任务中运行startCMD()。在这里，输入流被扫描，直到它有数据，然后cmd进程将处理它们。

但是行不通。

List<string> batch = new List<string>();
public volatile string output = "+";
public volatile string outputErr = "-";
Process CMD;
Task cmdTask;
volatile Queue<string> cmdQueue = new Queue<string>();
volatile public bool CMDrunning = false;

这很好

private void processBatch()
{
    Process p = new Process();
    ProcessStartInfo info = new ProcessStartInfo();
    info.FileName = "cmd.exe";
    info.RedirectStandardOutput = true;
    info.RedirectStandardError = true;
    info.RedirectStandardInput = true;
    info.UseShellExecute = false;
    p.StartInfo = info;
    p.Start();
    using (StreamWriter sw = p.StandardInput)
    {
        if (sw.BaseStream.CanWrite)
            foreach(string line in batch) sw.WriteLine(line);
    }
    output = "^"; outputErr = "~";
    try { output = p.StandardOutput.ReadToEnd(); } catch { }
    try { outputErr = p.StandardError.ReadToEnd(); } catch { }
    try { p.WaitForExit(); } catch { }
    tb_output.AppendText(output + "'r'n" + outputErr + "'r'n");
}

这些不完全，但几乎…

private void setupCMD()
{
    CMD = new Process();
    ProcessStartInfo info = new ProcessStartInfo();
    info.FileName = "cmd.exe";
     // info.Arguments = "/K";   // doesn't make a difference
    info.CreateNoWindow = true;
    info.RedirectStandardOutput = true;
    info.RedirectStandardError = true;
    info.RedirectStandardInput = true;
    info.UseShellExecute = false;
    CMD.StartInfo = info;
}

private void startCMDtask()
{
    var task = Task.Factory.StartNew(() => startCMD());
    cmdTask = task;
}

private void startCMD()
{
    try   { CMD.Start(); CMDrunning = true; } 
    catch { output = "Error starting cmd process.'r'n"; CMDrunning = false; }
    using (StreamWriter sw = CMD.StandardInput)
    {
        if (sw.BaseStream.CanWrite)
            do {  
                try 
                {
                    string cmd = cmdQueue.Dequeue();
                    if (cmd != null & cmd !="")
                    {
                        sw.WriteLine(cmd);
                        processOutputStreams();
                    }
                } 
                catch {} 
            } while (CMDrunning);
    }

private void processOutputStreams()
{
    string newOutput = ""; string newOutputErr = "";
    while (CMD.StandardOutput.Peek() > 0)
              newOutput += (char)(CMD.StandardOutput.Read());
    newOutput += "!?";    // at this point stdout is correctly captured  (1)  
    try {
      while (CMD.StandardError.Peek() > 0)    // from here execution jumps away (2)
      { newOutputErr += (char)(CMD.StandardError.Read()); }
    } catch { 
        newOutputErr = "?";   // never comes here
    }

    lock (output)    // no noticable difference
    lock (outputErr) //
    {                // if I jump here (3) from (1) the result is displayed
                     // but not if i comment out the 2nd while loop (2)
        if (newOutput != null & newOutput != "") output += newOutput + "'r'n";
        if (newOutputErr != null & newOutputErr != "") outputErr += newOutputErr + "'r'n";
    }
}

这是主线程中输入处理器的调用:

lock (cmdQueue) cmdQueue.Enqueue(cmd);

我不知道哪一部分是问题:进程，cmd shell，输入流，输出流，线程，锁或所有它轮流…??

private void startCMDtask()
{
    var task = Task.Factory.StartNew(() => startCMD());
    cmdTask = task;
}
private async void startCMD()
{
    try   { CMD.Start(); CMDrunning = true; } 
    catch { cmdErrOutput.Append("'r'nError starting cmd process."); 
            CMDrunning = false; }
    CMD.BeginOutputReadLine();
    CMD.BeginErrorReadLine();
    using (StreamWriter sw = CMD.StandardInput)
    {
        if (sw.BaseStream.CanWrite)
            do {  
                try 
                {
                    string cmd = cmdQueue.Dequeue();
                    if (cmd != null & cmd !="")  await sw.WriteLineAsync(cmd);
                } 
                catch { } 
            }   while (CMDrunning);
        try   { CMD.WaitForExit(); } 
        catch { cmdErrOutput.Append("WaitForExit Error.'r'n"); }
    }
}

private void setupCMD()
{
    CMD = new Process();
    ProcessStartInfo info = new ProcessStartInfo();
    info.FileName = "cmd.exe";
    info.CreateNoWindow = true;
    info.RedirectStandardOutput = true;
    info.RedirectStandardError = true;
    info.RedirectStandardInput = true;
    info.UseShellExecute = false;
    CMD.OutputDataReceived += new DataReceivedEventHandler(cmdOutputDataHandler);
    CMD.ErrorDataReceived += new DataReceivedEventHandler(cmdErrorDataHandler);
    cmdOutput = new StringBuilder();
    cmdErrOutput = new StringBuilder();
    CMD.StartInfo = info;
}

private static void cmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
{
    if (!String.IsNullOrEmpty(outLine.Data))
    {  // Add the text to the collected output.
        cmdOutput.Append(Environment.NewLine + outLine.Data);
    }
}
private static void cmdErrorDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
{
    if (!String.IsNullOrEmpty(outLine.Data))
    {  // Add the text to the collected error output.
        cmdErrOutput.Append(Environment.NewLine + outLine.Data);
    }
}

    cmdUnDoStack.Push(cmd);
    Application.DoEvents();
    TaskScheduler uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();
    Task.Factory.StartNew(() => updateOutputArea(uiScheduler));

private void updateOutputArea(TaskScheduler uiScheduler)
{
    Task.Factory.StartNew(() =>
    {
        tb_output.AppendText(cmdOutput + "'r'n" + cmdErrOutput + "'r'n");
        cmdOutput.Clear();
        cmdErrOutput.Clear();
    }, System.Threading.CancellationToken.None, TaskCreationOptions.None, uiScheduler);

    }