C# Capturing Python.exe Output And Displaying It In Textbox

I have worked on this issue for a while. I can capture the output(live) of the console window just fine, but I can't capture the output of a python console application in real tim

Solution 1:

I just ran into this question myself, and after a ton of experimenting, what worked for me was running the python process with the "-u" option, which makes the output unbuffered. With that, everything worked completely fine.

Solution 2:

I ran into this problem while making a MiniConsole exactly for that purpose.

I used your technique with

pro.EnableRaisingEvents = true;
pro.OutputDataReceived +=newDataReceivedEventHandler(OnDataReceived);
pro.ErrorDataReceived +=newDataReceivedEventHandler(OnDataReceived);

The strange thing is that all the output was coming from ErrorDataReceived instead of OutputDataReceived (with valid commands).

So I think you're missing:

pro.BeginErrorReadLine();

Also I was starting the process in the main thread (I don't have any worker), using python27.

Here is the full start:

// executable: "c:\\python27\\python.exe", arguments: "myscript.py"ProcessStartInfostartInfo=newProcessStartInfo(executable, arguments);
        startInfo.CreateNoWindow = true;
        startInfo.UseShellExecute = false;
        startInfo.RedirectStandardOutput = true;
        startInfo.RedirectStandardError = true;
        startInfo.WindowStyle = ProcessWindowStyle.Hidden;
        startInfo.WorkingDirectory = textBoxWorkingDirectory.Text;

        try
        {
            Processp=newProcess();
            p.StartInfo = startInfo;
            p.EnableRaisingEvents = true;
            p.OutputDataReceived += newDataReceivedEventHandler(OnDataReceived);
            p.ErrorDataReceived += newDataReceivedEventHandler(OnDataReceived);
            p.Exited += newEventHandler(OnProcessExit);
            p.Start();
            p.BeginOutputReadLine();
            p.BeginErrorReadLine();
        }

Solution 3:

I remember having a similar issue a while back and I think I did something similar to this in my .py scripts instead of using the print function:

sLog = 'Hello World!'
subprocess.Popen( 'echo ' + sLog, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True )

Not sure if I set the shell parameter to True or False though. Also not sure about all the "std" parameters. You might want to experiment a bit there.

Solution 4:

If you're starting the Python process from your code, then THIS will make your life really easy and I think it's about the cleanest way to go.