从外部程序/控制台读取

Question

I have a problem, I need to execute a console program and I have to show the output information of that console on my program. I have a string variable called "result" that have to storage that information, but is always null and I don't know why. Can anyone help me? I put the code below:

 Process p = new Process();
            p.StartInfo.FileName = "python";
            p.StartInfo.Arguments = @"C:\Users\xxx\xxx\xxx\xxx_\xxx yyy\zzz.py " + path;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.UseShellExecute = false;
            p.Start();

            StreamReader sr = p.StandardOutput;
            p.WaitForExit();
            string result = sr.ReadToEnd();
            sr.Close();

            textBox1.Text = result;

On the console, I recieve 8382 JGK, for example, but my result variable is always "".

Answer 1

You could try something like this

StreamReader sr = p.StandardOutput;
p.WaitForExit();
char[] result = new char[p.Length]; //or sr.BaseStream.Length
sr.Read(result,0,(int)p.Length); // again or sr.BaseStream.Length

And see if result array contains anything.

Answer 2

I solve it! The problem was on the file's path. I have to put it on the same folder as the ".py" file and it works fine. I add the correct piece of code:

 string python = @"C:\xxx\python.exe";
        string myPythonApp = "program.py";
        string x = @"file.jpg";

        ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(python);
        myProcessStartInfo.UseShellExecute = false;
        myProcessStartInfo.RedirectStandardOutput = true;
        myProcessStartInfo.Arguments = myPythonApp + " " + x;

        Process myProcess = new Process();
        myProcess.StartInfo = myProcessStartInfo;
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.Start();
        StreamReader myStreamReader = myProcess.StandardOutput;
        string myString = myStreamReader.ReadLine();
        myProcess.WaitForExit();
        myProcess.Close();
        textBox1.Text = myString;