Getting the form of a childprocess

Question

i am trying to get the main form of a process that i started, but the FromChildHandle and FromHandle always return null. the MainWindowHandle however is nonzero.

IntPtr p = process_wrapper.MainWindowHandle;
Form form = (Form) Control.FromChildHandle(p);
if (form != null)
{
    form.Close();
}

Answer 1

You can only retrieve a form as a control, if the form in question has been generated by your application. You cannot retrieve a form from another process, as your parent process is not aware of the handle <->Control mapping of the child process.

If you just want to "stop" the child process (form.close() ?) You can simple stop the complete process. Either "Clean", or by force:

process.CloseMainWindow() vs process.kill()