Redirect the output (stdout, stderr) of a child process to the Output window in Visual Studio

Question

At the moment I am starting a batch file from my C# program with:

System.Diagnostics.Process.Start(@\"DoSomeStuff.bat\");

What I would like

Answer 1

Have you considered using a DefaultTraceListener ?

    //Create and add a new default trace listener.
    DefaultTraceListener defaultListener;
    defaultListener = new DefaultTraceListener();
    Trace.Listeners.Add(defaultListener);

Answer 2

process.StartInfo.CreateNoWindow = true;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.OutputDataReceived += (sender, args) => Console.WriteLine(args.Data);
process.Start();
process.BeginOutputReadLine();

process.WaitForExit();

Same idea for Error, just replace Output in those method/property names.

Answer 3

What's going on here is that Visual Studio is displaying the debug output from the program in the Output Window. That is: if you use Trace.WriteLine, it'll appear in the Output Window, because of the default trace listener.

Somehow, your Windows Form application (when it uses Console.WriteLine; I'm assuming you're using Console.WriteLine) is also writing debug output, and Visual Studio is picking this up.

It won't do the same for child processes, unless you explicitly capture the output and redirect it along with your output.

Answer 4

A variation of this works for me --posting this now because I wish I'd found it earlier. Note that this is just a fragment extracted from the real code so there may be trivial errors.

The technique is based on some MSDN code. What I haven't been able to figure out is how to get the output window to update "on the fly". It doesn't update until after this task returns.

// Set this to your output window Pane
private EnvDTE.OutputWindowPane _OutputPane = null;

// Methods to receive standard output and standard error

private static void StandardOutputReceiver(object sendingProcess, DataReceivedEventArgs outLine)
{
   // Receives the child process' standard output
   if (! string.IsNullOrEmpty(outLine.Data)) {
       if (_OutputPane != null)
           _OutputPane.Write(outLine.Data + Environment.NewLine);
   }
}

private static void StandardErrorReceiver(object sendingProcess, DataReceivedEventArgs errLine)
{
   // Receives the child process' standard error
   if (! string.IsNullOrEmpty(errLine.Data)) {
       if (_OutputPane != null)
           _OutputPane.Write("Error> " + errLine.Data + Environment.NewLine);
   }
}

// main code fragment
{
    // Start the new process
    ProcessStartInfo startInfo = new ProcessStartInfo(PROGRAM.EXE);
    startInfo.Arguments = COMMANDLINE;
    startInfo.WorkingDirectory = srcDir;
    startInfo.UseShellExecute = false;
    startInfo.RedirectStandardOutput = true;
    startInfo.RedirectStandardError = true;
    startInfo.CreateNoWindow = true;
    Process p = Process.Start(startInfo);
    p.OutputDataReceived += new DataReceivedEventHandler(StandardOutputReceiver);
    p.BeginOutputReadLine();
    p.ErrorDataReceived += new DataReceivedEventHandler(StandardErrorReceiver);
    p.BeginErrorReadLine();
    bool completed = p.WaitForExit(20000);
    if (!completed)
    {
        // do something here if it didn't finish in 20 seconds
    }
    p.Close();
}