Problem Redirecting Standard output with ProcessStartInof

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I have scenario where in i Need to capture the output from console emitted by perl scripts.
I have used the below code block to accomplish this

C#

myProcessStartInfo = new ProcessStartInfo("C:\\Win16App\\Perl\\bin\\perl.exe");
                myProcessStartInfo.Arguments = scriptPath;
                myProcessStartInfo.UseShellExecute = false;
                // myProcessStartInfo.RedirectStandardOutput = true;
                myProcessStartInfo.RedirectStandardOutput = true;
                myProcessStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                myProcessStartInfo.CreateNoWindow = true;
                myProcess.StartInfo = myProcessStartInfo;
                myProcess.OutputDataReceived += new DataReceivedEventHandler(myProcess_OutputDataReceived);
                                               
 myProcess.Start();
                //  m_progBar.Value = 100;
                // myProcess.StandardOutput.ReadLine();
                myProcess.BeginOutputReadLine();

Posted 30-Aug-11 4:06am

explorerC

Updated 30-Aug-11 4:09am

RaisKazi

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-08-30T12:25:00

I see a couple of problems here. First, you should probably redirect not only stdout but also stderr using System.Diagnostics.Process.StandardError. Those multiplatform tool always make it difficult to see it if you redirect the output from console using pipe, but Process makes it right.

Also, I don't see any code where you actually capture StandardInput or StandardError.

Look at this code sample: http://msdn.microsoft.com/en-us/library/system.diagnostics.process.standardoutput.aspx[^].

As you're using BeginOutputReadLine, use this code sample: http://msdn.microsoft.com/en-us/library/system.diagnostics.process.beginoutputreadline.aspx[^].

I don't think you really need asynchronous read operations though. It's much more straightforward to use a separate thread for creation process and waiting for its end. I think asynchronous operations were only good before threads were introduced. If you use my advice and use thread (which I highly recommend), you can use the pattern shown in a first code sample. In this thread, you can safely use the blocking call to System.Diagnostics.Process.WaitForExit().

See also http://msdn.microsoft.com/en-us/library/system.diagnostics.process.aspx[^].

—SA

Espen Harlinn · Answer 2 · 2011-08-30T13:00:00

Try:

using System;
using System.Diagnostics;
 
namespace RedirectExample
{
    class Program
    {
        static void Main()
        {
            Process p = new Process();
            p.StartInfo = new ProcessStartInfo( "C:\\Win16App\\Perl\\bin\\perl.exe", scriptPath )
                {
                    RedirectStandardOutput = true,
                    UseShellExecute = false,
                    CreateNoWindow = true
                };
            p.Start();
            string output = p.StandardOutput.ReadToEnd();
            p.WaitForExit();
            Console.WriteLine(output);
            Console.Read();
        }
    }
}

Also remember that 64 bit Windows does not support 16 bit applications[^].

Best regards
Espen Harlinn

#realJSOP · Answer 3 · 2011-08-30T04:44:00

Solution 1

Try adding this:

C#

myProcessStartInfo.EnableRaisingEvents = true;

Posted 30-Aug-11 4:44am

#realJSOP

Problem Redirecting Standard output with ProcessStartInof

3 solutions

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