Obtain Exitcode from CMD using c#

Posted on 2010-09-17
Last Modified: 2012-05-10
I am using following code to write the PATH, EXECUTABLE NAME and ARGUMENTS to a batch file and execute it through CMD using c#. The problem is sometimes the application dosent starts up after executing the batch file. And the c# code dosent give me exception or any notification.

For which i want to get the Exitcode from CMD to determine if the commands executed properly. How can i determine Exit code ?

script inside Batchfile : [Note that Notepads.exe is wrong to get the error ]

START Notepads.EXE

"if "%ERRORLEVEL%" == "1" exit /B 1"
public void Execute()
            string LatestFileName = GetLastWrittenBatchFile();
            if (System.IO.File.Exists(BatchPath + LatestFileName))
                System.Diagnostics.ProcessStartInfo procinfo = new System.Diagnostics.ProcessStartInfo("cmd.exe");
                procinfo.UseShellExecute = false;
                procinfo.RedirectStandardError = true;
                procinfo.RedirectStandardInput = true;
                procinfo.RedirectStandardOutput = true;

                System.Diagnostics.Process process = System.Diagnostics.Process.Start(procinfo);

                System.IO.StreamReader stream = System.IO.File.OpenText(BatchPath + LatestFileName);
                System.IO.StreamReader sroutput = process.StandardOutput;
                System.IO.StreamWriter srinput = process.StandardInput;

                while (stream.Peek() != -1)

                Log.Flow_writeToLogFile("Executed .Bat file : " + LatestFileName);
                int iExitCode = process.ExitCode;
                ExceptionHandler.writeToLogFile("File not found");
        catch (Exception ex)
            ExceptionHandler.writeToLogFile(System.Environment.NewLine + "Target  :  " + ex.TargetSite.ToString() + System.Environment.NewLine + "Message :  " + ex.Message.ToString() + System.Environment.NewLine + "Stack   :  " + ex.StackTrace.ToString());

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Question by:srk1982
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LVL 53

Expert Comment

ID: 33699234
Subscribe to the event Exited event on the Process returned by Process.Start()  

 Process p = Process.Start(....);
p.Exited += new EventHandler(Process_Exited);

Process_Exited(object sender, eventargs e)
  Process p = sender as Process;
  p.ExitCode //this tell if there was an error or not
} Alternatively you can subscribte to ErrorDataReceived

Author Comment

ID: 33699323
@Dhaest, Pls tell me a solution with respect to my question. Because i am not starting a process directly from c# code.
I am writing the PATH, EXECUTABLE NAME and ARGUMENTS to a batch file and execute it through CMD using c#.
In this case, how can i get the error ?
LVL 53

Expert Comment

ID: 33699337
It is much easier to run the process directly instead of using creating a batch file that you later execute since you lose some control since you are using a batch script layer
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LVL 53

Expert Comment

ID: 33699346
Can you do it like this example ?
.NET Tip: Execute Commands From C#

Author Comment

ID: 33699353
@Dhaest, What you said is absolutely correct. But i have to do it using batch file according to my requirement. They have a reason to use it. Kindly help me to do using batch file itself. Thanks.
LVL 53

Expert Comment

ID: 33699403
I'm not sure if it's possible. The only thing I can think of right now, is too run the batch and output the exitcode to a file or something, which you can read in later in your program....

I don't think that I can help you further on this, because I would do it like I said earlier...

Author Comment

ID: 33699415
@:Dhaest The only thing I can think of right now, is too run the batch and output the exitcode to a file or something, which you can read in later in your program...."     This is what i want !!! It want to log the info.. Pls tell me how to do it...
LVL 53

Expert Comment

ID: 33699436
You can add it on several ways in your bat-file.

Another usefull resource:

Sub AppendTextFile(FileNameDst, FileNameSrc)

  ' Copy a file at the end of another file
  Const ForReading = 1, ForWriting = 2, ForAppending = 8
  Dim fso, fDst, fSrc

  Set fso = CreateObject("Scripting.FileSystemObject")
  Set fDst = fso.OpenTextFile(FileNameDst, ForAppending,True)

  Set fSrc = fso.OpenTextFile(FileNameSrc, ForReading,True)
  Do Until fSrc.AtEndOfStream
    fDst.WriteLine fSrc.ReadLine


End Sub

Wscript.Echo "Starting appending files..."
Call AppendTextFile("test1.log", "test2.log")
Wscript.Echo "Done"

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Accepted Solution

srk1982 earned 0 total points
ID: 33713785
System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo(filename);
                    psi.RedirectStandardOutput = true;
                    psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
                    psi.UseShellExecute = false;
                    System.Diagnostics.Process listFiles;
                    listFiles = System.Diagnostics.Process.Start(psi);
                    System.IO.StreamReader myOutput = listFiles.StandardOutput;
                    if (listFiles.HasExited)
                        string output = myOutput.ReadToEnd();

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