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Get keyboard status in WPF Application in Main-Method during startup

Answer 1

+2 A:

Use Keyboard.IsKeyDown() static method will help you to check the state of the keys you're interested in.

if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)
       || Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt) )
{
    //Load in a special mode
}
else
{
    //Load standard mode
}

ArsenMkrt 2009-10-09 07:19:32

Answer 2

A:

If you really need to do it in the main method you will have to use

[DllImport("user32.dll")]
public static extern int GetKeyboardState(byte [] lpKeyState);

docs here

because the Keyboard static members that you'd normally use do not work at that point:

Keyboard.Modifiers Keyboard.IsKeyDown

But you could try to hookup to the Application.Startup event and do your keyboard testing there.

bitbonk 2009-10-09 07:22:10

he doesn't wanna do DLL Imports. Probably looking a way that is inside the .net namespaces itself.

vikramjb 2009-10-09 07:27:31

You don't need to import anything when using Keyboard.Modifiers. But there is a slight chance that Keyboard.IsKeyDown and Keyboard.Modifiers do not work at the begging of the main method. Thats where he wants to use it. That's why I introduced him to GetKeyboardState. this will work in any case. There is nothing wrong or bad in using Dllimport unless you are in sliverlight of course.

bitbonk 2009-10-09 08:02:42

Indeed it seems IsKeyDown in not working inside main. Will try something else.

Holli 2009-10-09 08:05:11

As I said, there is nothing wrong with dllimport but you could try to hookup to the Application.Startup event and do your keyboard test there. I add this to my answer.

bitbonk 2009-10-09 08:41:43

Answer 3

A:

You might want to check this question [SO]

I had the same problem and ended up checking for the keyboard modifiers in the Loaded event...

PaulB 2009-10-09 08:56:33

Not exactly what I had in mind. I want to check the keys before any window is loaded because if the Ctrl-Key is pressed during startup I want to load a completely different window.GetKeyboardState is the only thing that seems to work inside the main-method.

Holli 2009-10-09 13:14:22

Ah ... fair enough :)

PaulB 2009-10-09 13:41:22

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Get keyboard status in WPF Application in Main-Method during startup

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