Process.Start() get errors from command prompt window

Question

I'm trying to Start command promt process with args. Now I want to obtain information about errors if they exist.

someProcess = System.Diagnostics.Process.Start(cmd, someArgs);

Best regards, loviji

Totally vague question. What kind of error? – Nayan Apr 25 '10 at 18:05 — Nayan, Apr 25 '10 at 18:05
It is not a vague question at all. Comprehensible. – cgalvao1993 Aug 19 '14 at 14:13 — cgalvao1993, Aug 19 '14 at 14:13

score 13 · Accepted Answer · answered Apr 25 '10 at 17:52

13

The other answers are correct. Here is some code you could use:

ProcessStartInfo startInfo = new ProcessStartInfo(cmd, args);
startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = true;
Process someProcess = Process.Start(startInfo);
string errors = someProcess.StandardError.ReadToEnd();

Note that if the file is not found you won't get an error on standard error. You will get an exception instead.

answered Apr 25 '10 at 17:52

Mark Byers

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Note that the call to ReadToEnd might never terminate. To avoid deadlock use the asynchronous read methods instead. See my answer here: http://stackoverflow.com/questions/139593/processstartinfo-hanging-on-waitforexit-why/7608823#7608823 – Mark Byers Nov 09 '11 at 14:37
I follow your ans. and got this error in errors (string var.) 'casperjs' is not recognized as an internal or external command,\r\noperable program or batch file.\r\n Plz give any solution if exist – Unknown_Coder Oct 10 '17 at 06:48

score 2 · Answer 2 · answered Apr 25 '10 at 17:45

2

You're probably looking for the StandardError property.

answered Apr 25 '10 at 17:45

SLaks

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score 2 · Answer 3 · answered Apr 25 '10 at 17:46

Process.StandardError Property:

Gets a stream used to read the error output of the application.

This should do what you want.

Note

To use StandardError, you must set ProcessStartInfo.UseShellExecute to false, and you must set ProcessStartInfo.RedirectStandardError to true. Otherwise, reading from the StandardError stream throws an exception.

Process.Start() get errors from command prompt window

3 Answers3

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