Use RegisterHotkey and WM_HOTKEY to do global hotkey application

Hi all,
I try to register windows hotkey through using user32.dll RegisterHotkey function and get the windows message to process future applications.
My code is attached as follows, and the user32.dll is called in the Register Hotkey and Unregister Hotkey subVI.
This is the Register Hotkey SubVI. The x0 is the hWnd.
This is the Unregister Hotkey SubVI.
The Windows Message Queue Library can be found here.
http://sine.ni.com/devzone/cda/epd/p/id/4394
I don't know why I am not getting any windows message out of this scenario, even though the RegisterHotkey function seems to work.
Please provide some suggestion for this application.
Thank you
Bboyz

Hi,
The Main VI and the subVI are here.
Please help me to check if the Call Library Function Node can work properly.
Thank you
Attachments:
NIHotkey.vi ‏16 KB
RegisterHotKey.vi ‏18 KB
UnregisterHotKey.vi ‏14 KB

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