Read process Output Message from process within the process?

arun ragam

I am running an exe through commandline and getting following output.

C:\Users\sysadmin>C:\Users\sysadmin\Desktop\New_folder\Setup\PatchInstaller.exe --mode=silent

C:\Users\sysadmin Begin Setup UI mode: Silent Error : Another instance running, Only a single instance can be run at a time. Exit Code: 11

i am running this through System.daignostics.process.

My issue is PatchInstaller.exe calling another process and the output of that nested process is what is visible with cmd. but the same result and exit code i am not able to get through Process object ofPatchInstaller.exe. Is there any way of getting output of process running within process?

Following is the code i have tired...

string command = @"C:\Users\sysadmin\Desktop\Setup\PatchInstaller.exe";

string result = string.Empty;

System.Diagnostics.ProcessStartInfo procStartInfo = new ProcessStartInfo();

procStartInfo = new System.Diagnostics.ProcessStartInfo("cmd", "/c " + command + " --mode=silent);

System.Diagnostics.Process proc = new Process();

procStartInfo.ErrorDialog = false;

procStartInfo.UseShellExecute = false;

procStartInfo.RedirectStandardOutput = true;

procStartInfo.RedirectStandardError = true;

procStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;

// Do not create the black window.

procStartInfo.CreateNoWindow = true;

if (!string.IsNullOrEmpty(domain) && !string.IsNullOrEmpty(user) && !string.IsNullOrEmpty(pwd))

{

procStartInfo.Domain = domain;

procStartInfo.UserName = user;

System.Security.SecureString ss = new System.Security.SecureString();

foreach (char c in pwd) { ss.AppendChar(c); }

procStartInfo.Password = ss;

}

proc = System.Diagnostics.Process.Start(procStartInfo);

proc.ErrorDataReceived += delegate(object sender, System.Diagnostics.DataReceivedEventArgs errorLine)

{

if (errorLine.Data != null) result += "error:" + errorLine.Data +;

};

proc.OutputDataReceived += delegate(object sender, System.Diagnostics.DataReceivedEventArgs outputLine)

{

if (outputLine.Data != null) result += outputLine.Data +;

};

proc.BeginErrorReadLine();

proc.BeginOutputReadLine();

proc.WaitForExit();

More Explanation

Here my exe is running and it will execute the below line first,

C:\Users\sysadmin\Desktop\New_folder\Setup\PatchInstaller.exe --mode=silent

Now PatchInstaller.exe is internally executing other process, I am expecting the output from this internal process,

(Example A:

C:\Users\sysadmin\Desktop\New_folder\Setup\PatchInstaller.exe --mode=silent

C:\Windows\system32>Begin Setup
UI mode: Silent
Error : Conflicting Processes running.
Exit Code: 19
)

(Note: PatchInstaller.exe is thirdparty exe. When we are excuting from command-line we are getting (Example A) output. )

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta10y ago

Before starting your process, call all the events handlers of standardOutput. Here you are calling after starting your process.

Have a look to the following code:

using System;

 using System.Collections.Generic;

using System.Diagnostics;

 using System.Linq;

using System.Text;

using System.Threading.Tasks;

 namespace Test_CmdExec

class Program

   static void Main(string[] args)

try

  using (Process p = new Process())

     // set start info

     p.StartInfo = new ProcessStartInfo("cmd.exe")

   RedirectStandardInput = true,

    UseShellExecute = false,

   WorkingDirectory = @"d:\"

};

 // event handlers for output & error

    p.OutputDataReceived += p_OutputDataReceived;

    p.ErrorDataReceived += p_ErrorDataReceived;

       // start process

     p.Start();

 // send command to its input

  p.StandardInput.Write("dir" + p.StandardInput.NewLine);

 //wait

p.WaitForExit();

}             }

catch (Exception ex)

 Console.WriteLine(ex);

}         }

static void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)

Process p = sender as Process;

        if (p == null)

         return;

 Console.WriteLine(e.Data);

  static void p_OutputDataReceived(object sender, DataReceivedEventArgs e)

 Process p = sender as Process;

          if (p == null)

          return;

 Console.WriteLine(e.Data);

Hope it helps

Amit Gupta10y ago

Before starting your process, call all the events handlers of standardOutput. Here you are calling after starting your process.

Have a look to the following code:

using System;

 using System.Collections.Generic;

using System.Diagnostics;

 using System.Linq;

using System.Text;

using System.Threading.Tasks;

 namespace Test_CmdExec

class Program

   static void Main(string[] args)

try

  using (Process p = new Process())

     // set start info

     p.StartInfo = new ProcessStartInfo("cmd.exe")

   RedirectStandardInput = true,

    UseShellExecute = false,

   WorkingDirectory = @"d:\"

};

 // event handlers for output & error

    p.OutputDataReceived += p_OutputDataReceived;

    p.ErrorDataReceived += p_ErrorDataReceived;

       // start process

     p.Start();

 // send command to its input

  p.StandardInput.Write("dir" + p.StandardInput.NewLine);

 //wait

p.WaitForExit();

}             }

catch (Exception ex)

 Console.WriteLine(ex);

}         }

static void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)

Process p = sender as Process;

        if (p == null)

         return;

 Console.WriteLine(e.Data);

  static void p_OutputDataReceived(object sender, DataReceivedEventArgs e)

 Process p = sender as Process;

          if (p == null)

          return;

 Console.WriteLine(e.Data);

Hope it helps