Calling python script from C# doesn't work, without throwing error

Question

I am writing a C# program to execute a python script with some arguments. The program is not executed(it is supposed to not only print out a message, but also to write to a file), even though there is no error and the Process ExitCode is 0(checked via the debugger). Where am I going wrong?

    static private string ExecutePython(string sentence) {
        // full path of python interpreter  
        string python = @"C:\Python27\python.exe";

        // python app to call  
        string myPythonApp = @"C:\Users\user_name\Documents\pos_edit.py";

        // Create new process start info 
        ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(python);

        // make sure we can read the output from stdout 
        myProcessStartInfo.UseShellExecute = false;
        myProcessStartInfo.RedirectStandardOutput = true;


        myProcessStartInfo.Arguments = string.Format("{0} {1}", myPythonApp, sentence);

        Process myProcess = new Process();
        // assign start information to the process 
        myProcess.StartInfo = myProcessStartInfo;

        // start process 
        myProcess.Start();

        // Read the standard output of the app we called.  
        StreamReader myStreamReader = myProcess.StandardOutput;
        string myString = myStreamReader.ReadToEnd();

        // wait exit signal from the app we called 
        myProcess.WaitForExit();

        // close the process 
        myProcess.Close();

        return myString;
}

@Aya no. But I got an alternative to work without taking stdout. — goluhaque
– goluhaque, Commented Jun 26, 2016 at 8:38

Dmitrii Bychenko · Accepted Answer · 2016-06-25 18:52:32Z

1

You've put myProcess.WaitForExit(); in the wrong place; wait till Python has executed the script:

...
myProcess.Start();

StreamReader myStreamReader = myProcess.StandardOutput;

// first, wait to complete
myProcess.WaitForExit();

// only then read the results (stdout)
string myString = myStreamReader.ReadToEnd();
...

answered Jun 25, 2016 at 18:52

Dmitrii Bychenko

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Comments

Ryan B. · Accepted Answer · 2016-06-25 18:56:31Z

0

Works perfectly fine with me. I think there's something with your user_name containing spaces.

answered Jun 25, 2016 at 18:56

Ryan B.

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