C#写了一个修改按键器DOTA能用，LOL游戏用不了，但是LOL里消息窗口输入修改过的按键是成功的

KeyboardHookStruct input = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
IntPtr wcHandle = FindWindow(null, "League of Legends (TM) Client");

            if (input.vkCode == (int)Keys.Z)
            {

                //如果钩子有效   
                if (wcHandle != IntPtr.Zero)
                {

                    //设置游戏窗口到最前   
                    SetForegroundWindow(wcHandle);
                    byte VK_Q = (byte)Keys.W;
                    keybd_event(VK_Q, 0, 0, 0);//按下
                    keybd_event(VK_Q, 0, KEYEVENTF_KEYUP, 0); //松开
                }   
                 return 1;   
            }

参考：http://www.cnblogs.com/cadlife/articles/2244775.html

这个上面没注释。。。能有清楚点的解释注释吗？