【WinForm程序】注册热键快捷键切换

#region Window 消息捕获
        const int WM_COPYDATA = 0x004A;
        public structCOPYDATASTRUCT
        {
            publicIntPtr dwData;
            public intcbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public stringlpData;
        }
        [DllImport("user32")]
        public static extern bool ChangeWindowMessageFilter(uint msg, intflags);  
        protected override void DefWndProc(refSystem.Windows.Forms.Message m)
        {
            switch(m.Msg)
            {
                caseWM_COPYDATA:
                    COPYDATASTRUCT mystr = newCOPYDATASTRUCT();
                    Type mytype =mystr.GetType();
                    mystr =(COPYDATASTRUCT)m.GetLParam(mytype);
                    Trace(mystr.lpData);
                    processCommand(mystr.lpData);
                    break;
                default:
                    base.DefWndProc(refm);
                    break;
            }
            //System.Diagnostics.Debug.WriteLine(DateTime.Now.ToString() + "  " + m.Msg.ToString());
}
        #endregion Window 消息捕获

        //注册热键的api
        [DllImport("user32")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uintcontrol, Keys vk);
        //解除注册热键的api
        [DllImport("user32")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, intid);
        private frmHotkeyTest testFrm = null;
        private void ShowTestFrm(string_text)
        {
            testFrm = newfrmHotkeyTest();
            this.WindowState =FormWindowState.Maximized;
            this.TopMost = true;
            this.Show();
            this.TopMost = false;
            testFrm.Text =_text;
            testFrm.ShowDialog();
        }
        protected override void WndProc(refMessage m)
        {
            switch(m.Msg)
            {
                case 0x0312:  //这个是window消息定义的注册的热键消息  
                    if (m.WParam.ToString() == "123")   //按下CTRL+Q隐藏  
{
                        testFrm = newfrmHotkeyTest();
                        testFrm.ShowDialog();
                    }
                    else if (m.WParam.ToString() == "456") //按下CTRL+W显示
{
                        testFrm.Close();
                    }
                    else if (m.WParam.ToString() == "103")
                    {
                        ShowTestFrm("F5");
                    }
                    else if (m.WParam.ToString() == "102")
                    {
                        ShowTestFrm("Ctrl+Alt+D");
                    }
                    else if (m.WParam.ToString() == "101")
                    {
                        ShowTestFrm("Ctrl+B");
                    }
                    else if (m.WParam.ToString() == "100")
                    {
                        ShowTestFrm("Shift+S");
                    }
                    break;
            }
            base.WndProc(refm);
        }

if (m.WParam.ToString() == "123")   //按下CTRL+Q隐藏