How to capture a mouseclick system-wide using System.Runtime.InteropServices

If you need a short sample to handle this rare issue, consider the following steps...

* create a new WPF Application
* add a reference to System.Runtime.InteropServices
* add a public static class called "hook.cs"
* in App.xaml.cs add a static variable to buffer the hook result code

public static int hHook =0 ;

* in hook.cs add the namespace System.Runtime.InteropServices
* in hook cs add a static public method called Register() and save the hook value in the hHook of App.xaml.cs
* in hook.cs add a static public method called Unregister()
* in hook.cs add a static method as the MouseProcedure to handle the global messages
* in hook.cs add 2x Imports to register, unregister the hook and add 1x Import to pass the hook-Event. (DllImport user32.dll)
* in hook.cs -> MouseProcedure reacts on the mouseclick signal WM_LBUTTONDOWN
* register the hook in the startup of the application through calling the static method register() of the class in the hook.cs
* by leaving the application unregister such hook again through the appropriate method in hook.cs

download the short sample project here and check it in detail!

(based on http://www.codeproject.com/Articles/17969/Mouse-Operations)

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