Why my process just opens a blank window and closes it immediately?

Question

I am trying to call convert.exe trough Process class from C# to convert a specific image to another format like this:

File.WriteAllBytes(inputFilePath, Convert.FromBase64String(image.Content));
Elmah.ErrorLog.GetDefault(HttpContext.Current).Log(new Error(new Exception("Succesfully wrote the image to: " + inputFilePath)));

var proc = new Process();
proc.StartInfo.Arguments = string.Format("{0} {1}", inputFilePath, outputFilePath);

proc.StartInfo.FileName = @"c:\Program Files (x86)\ImageMagick-6.7.7-Q16\convert.exe";
proc.StartInfo.CreateNoWindow = false;
proc.StartInfo.UseShellExecute = false;
proc.Start();
proc.WaitForExit();

I do not understand why it opens a command prompt and shuts it down immediately...Do you see any error in the code? The path to convert.exe is fine for sure...

Answer 1

You web application is running in the context of the IIS user, it may not have access to execute convert.exe. You could either try running IIS under a specific user (like you, if convert.exe works for you) or grant access in some way to let convert.exe run).

Answer 2

You can attach a Stream to the Process object to capture the output.

see the msdn doc