Question

I’m developing an Windows Forms application that requires me to call a separate program to perform a task. The program is a console application and I need to redirect standard output from the console to a TextBox in my program.

I have no problem executing the program from my application, but I don’t know how to redirect the output to my application. I need to capture output while the program is running using events.

The console program isn’t meant to stop running until my application stops and the text changes constantly at random intervals. What I’m attempting to do is simply hook output from the console to trigger an event handler which can then be used to update the TextBox.

I am using C# to code the program and using the .NET framework for development. The original application is not a .NET program.

EDIT: Here’s example code of what I’m trying to do. In my final app, I’ll replace Console.WriteLine with code to update the TextBox. I tried to set a breakpoint in my event handler, and it isn’t even reached.

    void Method()     {         var p = new Process();         var path = @'C:\ConsoleApp.exe';          p.StartInfo.FileName = path;         p.StartInfo.UseShellExecute = false;         p.OutputDataReceived += p_OutputDataReceived;          p.Start();     }      static void p_OutputDataReceived(object sender, DataReceivedEventArgs e)     {         Console.WriteLine('>>> {0}', e.Data);     } 

Answer 1

This works for me:

void RunWithRedirect(string cmdPath) {     var proc = new Process();     proc.StartInfo.FileName = cmdPath;      // set up output redirection     proc.StartInfo.RedirectStandardOutput = true;     proc.StartInfo.RedirectStandardError = true;         proc.EnableRaisingEvents = true;     proc.StartInfo.CreateNoWindow = true;     // see below for output handler     proc.ErrorDataReceived += proc_DataReceived;     proc.OutputDataReceived += proc_DataReceived;      proc.Start();      proc.BeginErrorReadLine();     proc.BeginOutputReadLine();      proc.WaitForExit(); }  void proc_DataReceived(object sender, DataReceivedEventArgs e) {     // output will be in string e.Data }