win7和XP下全局键盘钩子的方法并不相同
win7:
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, IntPtr.Zero, 0);
XP:
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()), 0);
可以先执行win7的语句，如果返回的hHook是0，就再执行一次XP的方法。
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