Question

I will start from the C++ application to explain my exact requirement. I had a C++ application , which takes an input (a small command called “run”) from console (keyboard) with out using any arguments( C++ application is using getchar() in the project). well the problem i am able to run the exe file from C# using System.Diagnostics.Process, but i want to enter the command “run” programitically in C# to execute C++ Application. Is it possible to do that?

Answer 1

Yes it is. You need to redirect the spawned process’s input stream so that you can write to it directly:

var proc = new Process();

proc.StartInfo.FileName = "program.exe";
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardInput = true;

proc.Start();
var sw = proc.StandardInput;

Now this will write to your process’s standard input, just as if you had typed the text using the keyboard:

sw.WriteLine("run something");

Finally, when you are done writing, don’t forget to clean up:

sw.Close();
proc.WaitForExit();
proc.Close();