/// <summary>
        /// 安裝鍵盤鉤子
        /// </summary>
        public void Hook_Start()
        {
            if (hHook == 0)
            {
                KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
                hHook = SetWindowsHookEx(
                    WH_KEYBOARD_LL, //鉤子型別
                    KeyBoardHookProcedure,//
 
回撥函式
                IntPtr.Zero,  // GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);區域性鉤子則為null, 
                0 //全域性鉤子為0,控制代碼鉤子為執行緒id
                );
                //如果設定鉤子失敗.
                if (hHook == 0)
                {
                    Hook_Clear();
                }
            }
        }
 

來自: http://www.neite.net/516.html