private IntPtr hHook;
        public const int WH_MOUSE_LL = 14;
        public HookProc hProc;
        public IntPtr SetHook()
        {
            hProc = new HookProc(MouseHookProc);
            //Process currentProcess = Process.GetCurrentProcess();
            //ProcessModule pm = null;
            IntPtr appPtr = IntPtr.Zero;
            Process[] pro = Process.GetProcesses();
            foreach (Process item in pro)
            {
                if (item.ProcessName == "calc") //如果为计算器，则记录实例句柄
                {
                    appPtr = item.Handle;
                    //pm = item.MainModule;
                    //currentProcess = item;
                    break;
                }
            }
            hHook = WinApiDeclar.SetWindowsHookEx((int)HookType.WH_MOUSE_LL, hProc, appPtr, 0);
            return hHook;
        }

private IntPtr MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
        {
            MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
            // 这个 MyMouseHookStruct.hwnd 始终等于0 ，不知道为什么
            if (nCode < 0)
            {
                return WinApiDeclar.CallNextHookEx(hHook, nCode, wParam, lParam);
            }
            else
            {
                //判断是否为我用的消息
                if ((int)wParam == 0x201 ) //点击消息
                {
                    //if (MyMouseHookStruct.hwnd)
                    //触发事件
                    if (_event_MouseMessage != null)
                    {
                        _event_MouseMessage(hHook);
                    }
                }
                this.Point = new POINT(MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y);
                return WinApiDeclar.CallNextHookEx(hHook, nCode, wParam, lParam);
            }
        }