How to get the error message with C#

Question

For vsinstr -coverage hello.exe, I can use the C# code as follows.

Process p = new Process();  StringBuilder sb = new StringBuilder("/COVERAGE ");  sb.Append("hello.exe");  p.StartInfo.FileName = "vsinstr.exe";  p.StartInfo.Arguments = sb.ToString();  p.Start();  p.WaitForExit(); 

When there's an error, I get the error message : Error VSP1018: VSInstr does not support processing binaries that are already instrumented..

How can I get this error message with C#?

SOLVED

I could get the error messages from the answers.

using System; using System.Text; using System.Diagnostics;  // You must add a reference to Microsoft.VisualStudio.Coverage.Monitor.dll  namespace LvFpga {     class Cov2xml     {         static void Main(string[] args)         {             Process p = new Process();             p.StartInfo.RedirectStandardOutput = true;             p.StartInfo.RedirectStandardError = true;                      p.StartInfo.UseShellExecute = false;               StringBuilder sb = new StringBuilder("/COVERAGE ");             sb.Append("helloclass.exe");             p.StartInfo.FileName = "vsinstr.exe";             p.StartInfo.Arguments = sb.ToString();             p.Start();              string stdoutx = p.StandardOutput.ReadToEnd();                      string stderrx = p.StandardError.ReadToEnd();                          p.WaitForExit();              Console.WriteLine("Exit code : {0}", p.ExitCode);             Console.WriteLine("Stdout : {0}", stdoutx);             Console.WriteLine("Stderr : {0}", stderrx);         }     } } 

Answer 1

You need to redirect the standard output or standard error. Here's a code sample for stdout:

Process p = new Process(); p.StartInfo.FileName = "hello.exe"; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.UseShellExecute = false; p.Start(); string stdout = p.StandardOutput.ReadToEnd();  p.WaitForExit(); 

Answer 2

You have to redirect StdError and read the stream to catch the errors.

System.Diagnostics.ProcessStartInfo processStartInfo =      new System.Diagnostics.ProcessStartInfo("MyExe.exe", "parameters ..."); int exitCode = 0; processStartInfo.RedirectStandardError = true; processStartInfo.RedirectStandardOutput = true; processStartInfo.CreateNoWindow = true; processStartInfo.UseShellExecute = false; System.Diagnostics.Process process = System.Diagnostics.Process.Start(processStartInfo);  process.WaitForExit(); //wait for 20 sec exitCode = process.ExitCode; string stdout = process.StandardOutput.ReadToEnd(); string stderr = process.StandardError.ReadToEnd();  // you should see the error string in stdout or stderr depending  // on how your console applicatione decided to output the failures.