Question by AAReverse · Mar 07, 2017 at 03:38 PM · freeze debugger process

Unity debugger hangs when using System.Diagnostics.Process

I'm using following code to start process:

 var startInfo = new ProcessStartInfo(executablePath);
 startInfo.WorkingDirectory = Path.GetDirectoryName(executablePath);
 startInfo.FileName = executablePath;
 startInfo.RedirectStandardOutput = true;
 startInfo.RedirectStandardInput = true;
 startInfo.RedirectStandardError = true;
 startInfo.UseShellExecute = false;
 startInfo.Arguments = arguments;
 startInfo.CreateNoWindow = true; 
 
 _process = new Process();
 _process.EnableRaisingEvents = false;
 _process.StartInfo = startInfo;
 _process.OutputDataReceived += _process_OutputDataReceived;
 _process.ErrorDataReceived += _process_ErrorDataReceived;
 _process.Start();
 _process.StandardInput.Close();
 _process.StandardError.Close();
 _process.BeginOutputReadLine();

Everything works fine without a debugger attached. As soon as I attach the visual studio debugger with a breakpoint Unity (and VS) freezes. It only reaches the breakpoint when _process writes something to its standard output.

When I remove _process.BeginOutputReadLine(); then the debugger works correctly. I would like to be able to use visual studio debugger when I debug scripts.

Am I doing something wrong? Or is there some workaround for this?

Add comment · Show 2

cihadturhan_unity · Mar 13, 2021 at 10:12 PM 0

Too bad there is no answer to this problem. I have the same problem and looking for a solution for hours. I have a little hope but asking here if you remember how you solved this issue. Thanks

AAReverse cihadturhan_unity · Mar 14, 2021 at 01:19 PM 0

If I remember correctly, the problem was not in the VS but in the process itself. The process was waiting for inco$$anonymous$$g data which, I guess, had blocking behavior. I had to send some data to the process just to keep it alive. I think I ended up constantly sending "DONT_GET_STUCK" string message :D to the process. I'm not really sure though if that was the solution. Just recalled that I did something like that. Hope that helps.

Unity debugger hangs when using System.Diagnostics.Process

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