user2435807 user2435807 - 1 year ago 81
C# Question

How do I close the on-screen keyboard process from C# winform correctly?

I'm currently designing an image viewer that allows the user to input her e-mail and get the images digitally. The part that troubles me is getting the on-screen keyboard to close. I use this piece of code to start the windows process:

string progFiles = @"C:\Program Files\Common Files\Microsoft Shared\ink";
string keyboardPath = Path.Combine(progFiles, "TabTip.exe");
Process keyboardProc = Process.Start(keyboardPath);

After which i open a VB InputBox to prompt for the e-mail address (for which i use the on-screen keyboard, since the application will be shown on a touch screen). After this prompt I want to close the process automatically.

I've tried to close the process with the following:

keyboardProc = null;

None of them works and simply throws the exception:

An unhandled exception of type 'System.InvalidOperationException' occurred in System.dll
Additional information: Cannot process request because the process has exited.

I also tried identifying the process by ID and closing it this way, didn't work either.
I also had a look at:
C#/.NET: Closing another process outside the main window
but didn't get it working either.. :(

I'm pretty new to C# and this is the first time I've invoked a windows process from code - am I missing something?

Thank you very much in advance!

Answer Source

u can do:

            Process process = new Process();

            process.StartInfo.FileName = progFiles;//Filename