How to invoke command line from C#?

How to invoke command line from C#?

• Chris Goedde

  Thanks alot. One last question. I wish to know if there's actually anyway to actually capture the output result of the command line. Like for example.. normally when my command is end successfully it produce 0 as success. If not it will produce some other error codes

  [WebMethod]

  public string Monochrome(string FileName, string Output)

  {

  String output = "";

  System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo(@"C:\magickBatch\monochrome.bat");

  psi.RedirectStandardOutput = true;

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

  psi.UseShellExecute = false;

  psi.Arguments = FileName + " " + Output;

  System.Diagnostics.Process listFiles;

  listFiles = System.Diagnostics.Process.Start(psi);

  System.IO.StreamReader myOutput = listFiles.StandardOutput;

  listFiles.WaitForExit(20000);

  if (listFiles.HasExited)

  {

  output = myOutput.ReadToEnd();

  }

  else

  {

  output = "fail";

  }

  return output;

  }

  For my current code, it doesn't able to capture that kind of information.

  
  

• Xiaobo Gu

  Take a look at Process Class

  here are some examples:

  Process myProcess = new Process();
  
  // Get the path that stores user documents.
  string myDocumentsPath =
  Environment.GetFolderPath(Environment.SpecialFolder.Personal);
  
  myProcess.StartInfo.FileName = myDocumentsPath + "\\MyFile.doc";
  myProcess.StartInfo.Verb = "Print";
  myProcess.StartInfo.CreateNoWindow = true;
  myProcess.Start();\

  ================================

  ProcessStartInfo startInfo = new ProcessStartInfo
  ("<someprogram>.exe");
  startInfo.WindowStyle = ProcessWindowStyle.Minimized;
  startInfo.FileName = filename;
  startInfo.Verb = "Print";
  Process.Start(startInfo);

  =================================

  if you need something more sophisticated take a look at article CommandLineHelper class to launch console applications and capture their output.

  hope this helps
  

  
  
  

• CS05pp2

  you do not need this line - Process flip = new Process(); because Start method is static

  be careful with paths . Try following:

  Process.Start(@"c:\<Path To convert.exe>\convert C:\test.jpg –flip c:\inverted.jpg");

  This is because your current path is application execution folder and you have folders in environment variable PATH. I think if you specify full paths everything will be fine.

  Hope this helps

  
  
  

• KerryLW

  I got this problem when I use standard output.

  Ok I got this batch file with the content

  identify -format "%%w|%%h" %1

  And it is use to identify the width and height of an image

  And when I use

  fileSize = System.Diagnostics.Process.Start(proc2);

  System.IO.StreamReader processOutput = fileSize.StandardOutput;

  fileSize.WaitForExit(20000);

  if (fileSize.HasExited)

  {

  result.exitStatus = processOutput.ReadToEnd();

  }

  I got this

  identify -format "%w%h" test.jpg 160|120

  All I want in fact is just the width and height of the image "160|120" only. I am not too sure why the batch file is actually echo the command line I am using as well. I don't need "identify -format "%w%h" test.jpg" is there anyway to actually get just the return value from the command line

  
  

• MarlAtkins

  you are right - to get exit code you have to use Process.ExitCode Property

  for getting output use Process.StandardOutput Property

  There are good samples.

  HTH

  
  
  

• Mateusz Rajca

  I can't seems to invoke this imagemagick command

  public void Flip(string FileName)

  {

  Process flip = new Process();

  Process.Start("convert C:\test.jpg –flip inverted.jpg");

  }

  If the command is not particular DOS command like cd and dir etc etc.. Do I need to do anything special to invoke them correctly And for the switches(parameters) like -flip and so on do I need to do anything to pass the parameters correctly

  By the way, I have installed the imagemagick software correctly on my Windows XP and it is working fine from command line.

  
  

• jason duncan

  Take a look at article CommandLineHelper class to launch console applications and capture their output.

  hope this helps

  
  
  

• Admann

  Sadly the article is very confusing to me. I can get the exit code and so on if the command line got error.

  That is

  if (process.HasExited)

  {

  process.ExitCode.ToString();

  }

  Is there any straight forward way to get the return values from a process For example if I call a kind of dir *.* ... I wish to get the directories values from the process.

  
  

• weiqj

  Thanks. I will try it out.
  
• How to invoke command line from C#?