Running cmd commands via .NET?

Question

System.Diagnostics.Process proc0 = new System.Diagnostics.Process();
proc0.StartInfo.FileName = "cmd";
proc0.StartInfo.WorkingDirectory = Path.Combine(curpath, "snd");
proc0.StartInfo.Arguments = omgwut;

And now for some background...

string curpath = System.IO.Path.GetDirectoryName(Application.ExecutablePath);

omgwut is something like this:

copy /b a.wav + b.wav + ... + y.wav + z.wav output.wav

And nothing happens at all. So obviously something's wrong. I also tried "copy" as the executable, but that doesn't work.

Daniel LeCheminant · Accepted Answer · 2009-03-27 23:00:21Z

16

Try the prefixing your arguments to cmd with /C, effectively saying cmd /C copy /b t.wav ...

According to cmd.exe /? using

/C <command>

Carries out the command specified by string and then terminates

For your code, it might look something like

// .. 
proc0.StartInfo.Arguments = "/C " + omgwut;

Notes:

A good way to test whether your command is going to work is to actually try it from a command prompt. If you try to do cmd.exe copy ... you'll see that the copy doesn't occur.
There are limits to the length of the arguments you can pass as arguments. From MSDN: "The maximum string length is 2,003 characters in .NET Framework applications and 488 characters in .NET Compact Framework applications."
You can bypass the shelling out to command by using the System.IO classes to open the files and manually concatenate them.

edited Mar 27, 2009 at 23:00

answered Mar 27, 2009 at 22:44

Daniel LeCheminant

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Comments

John Saunders · Accepted Answer · 2010-03-25 18:38:14Z

7

Try this it might help you.. Its working with my code.

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

// The following commands are needed to redirect the standard output.
// This means that it will be redirected to the Process.StandardOutput StreamReader.
procStartInfo.RedirectStandardOutput = true;
procStartInfo.UseShellExecute = false;
// Do not create the black window.
procStartInfo.CreateNoWindow = true;
// Now we create a process, assign its ProcessStartInfo and start it
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo = procStartInfo;
proc.Start();
// Get the output into a string
string result = proc.StandardOutput.ReadToEnd();
// Display the command output.
Console.WriteLine(result);
  }
  catch (Exception objException)
  {
  // Log the exception
  }

edited Mar 25, 2010 at 18:38

John Saunders

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answered Mar 25, 2010 at 18:36

vikas latyan

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1 Comment

John Saunders Over a year ago

You should add a throw; after logging the exception, unless this code is at the top level of the program. That will allow the exception to propagate to the callers.

ScottS · Accepted Answer · 2009-03-27 22:54:37Z

1

Daniels cmd /c idea will work. Keep in mind there is a limit to the length of a command line probably 8k in your case see this for details.

Since you are in a .Net app anyway, File.Copy may be quite a bit easier/cleaner than this approach.

answered Mar 27, 2009 at 22:54

ScottS

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1 Comment

Daniel LeCheminant Over a year ago

He's trying to append multiple files; not sure if you can do that with File.Copy

Jay Baxter · Accepted Answer · 2012-02-28 04:49:24Z

1

Even you can try this.. this is even better.

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

proc.EnableRaisingEvents=false;
proc.StartInfo.FileName="iexplore";
proc.StartInfo.Arguments="http://www.microsoft.com";

proc.Start();

proc.WaitForExit();

MessageBox.Show("You have just visited " + proc.StartInfo.Arguments);

edited Feb 28, 2012 at 4:49

Jay Baxter

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answered Mar 25, 2010 at 18:43

vikas latyan

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