Reading output from another running application

Question

I\'m working on a custom IDE in C# for a scripting language, and I have a problem.

I\'m trying to start the compiler process (pawncc.exe) and pass arguments to it. I

Answer 1

I dont have the pawnCC application so I cant try but it appears they restrict the verbosity of debugging information to external applications - apart from the command prompt.

Can you try spawning the pawncc.exe via cmd:

"cmd.exe \c CommandParameterToLaunchPawnCCwithArguments"

Answer 2

You need to redirect the standard error stream as well:

startInfo.RedirectStandardError = true;

Edit: I just reviewed the code and discovered that you are only readonly the StandardOutput stream.

I generally monitor the process for both the standard and error output streams using the DataReceived events on the process and adding the results into a stringbuilder, then storing the StringBuilder content in the UI element:

    private static System.Text.StringBuilder m_sbText;

    public Form3(string path)
    {
        InitializeComponent();

        this._path = path;

        Process myProcess = new Process();
        ProcessStartInfo startInfo = new ProcessStartInfo("pawncc.exe");
        startInfo.CreateNoWindow = true;
        startInfo.UseShellExecute = false;
        startInfo.RedirectStandardOutput = true;
        startInfo.RedirectStandardError = true;
        startInfo.Arguments = path + " -r -d2";
        myProcess.StartInfo = startInfo;

        m_sbText = new System.Text.StringBuilder(1000);

        myProcess.OutputDataReceived += ProcessDataHandler;
        myProcess.ErrorDataReceived += ProcessDataHandler;

        myProcess.Start();

        myProcess.BeginOutputReadLine();
        myProcess.BeginErrorReadLine();

        while (!myProcess.HasExited)
        {
            System.Threading.Thread.Sleep(500);
            System.Windows.Forms.Application.DoEvents();
        }
        RichTextBox1.Text = m_sbText.ToString();
    }

    private static void ProcessDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
    {
        // Collect the net view command output. 
        if (!String.IsNullOrEmpty(outLine.Data))
        {
            // Add the text to the collected output.
            m_sbText.AppendLine(outLine.Data);
        }
    }

There are obviously variations on this, but this should get you started.

Answer 3

I've noticed some sporadic issues when dealing with the raw output/error streams from spawned processes in the past, hence why I usually deal with captured output via eventing:

Process myProcess = new Process();
ProcessStartInfo startInfo = new ProcessStartInfo("pawncc.exe");
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;
startInfo.Arguments = path + " -r -d2";
myProcess.EnableRaisingEvents = true;
myProcess.OutputDataReceived += OnOutputDataReceived;
myProcess.ErrorDataReceived += OnErrorDataReceived;
myProcess.StartInfo = startInfo;
myProcess.Start();
myProcess.BeginOutputReadLine();
myProcess.BeginErrorReadLine();