Problem closing TabTip keyboard in Winform application

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Hi I have an issue with a .NET touchscreen application in Win7 (no PC keyboard connected). I am using part of the app to act as a terminal window to an external device. When the terminal window opens, I start the on screen keyboard by calling:-

C#

string progFiles = @"C:\Program Files\Common Files\Microsoft Shared\ink";
string onScreenKeyboardPath = System.IO.Path.Combine(progFiles, "TabTip.exe");
oskProcess = System.Diagnostics.Process.Start(onScreenKeyboardPath);

After I have finished with the terminal window, I wish to close the form by a single click on the X of the form, which will then automatically close the on screen keyboard. So I call:-

C#

Process[] oskProcessArray = Process.GetProcessesByName("TabTip");
foreach (Process onscreenProcess in oskProcessArray)
{
    onscreenProcess.Kill();
    onscreenProcess.Dispose();
}

This works perfectly, EXCEPT when the last key pressed was either a CTRL, ALT or SHIFT key. If this is the case, these remain "stuck" even after the keyboard is killed. If I restart the on screen keyboard, they are still highlighted.

If I click the red X of the keyboard firstly before closing my form, all is good. But I want/need to close both together by a single click from my code. SO, how do I clear any "stuck" keys when exiting the keyboard automatically, or is there a different way to do this?

Instead of killing the process, if I use :-
onscreenProcess.CloseMainWindow()
This will clear the "sticky" CTRL but does not exit the keyboard.

Posted 5-Oct-15 22:43pm

anthonyhu

Updated 6-Oct-15 22:23pm

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anthonyhu · Answer 1 · 2015-10-06T22:21:00

OK....
I found that if I wait a LONG time between calling the .CloseMainWindow() and the .Kill() it does work. I am just surprised that I have need to wait 1.5 seconds for the keyboard to close!
Not the most eloquent solution, but at least it works now:-

C#

Process[] oskProcessArray = Process.GetProcessesByName("TabTip");
foreach (Process onscreenProcess in oskProcessArray)
{
    Application.DoEvents();
    onscreenProcess.CloseMainWindow();
    Application.DoEvents();
    sleep(1500);
    onscreenProcess.Kill();
}