鳕鱼天空

This is Mr Wang's Tech Blog.

C#全局热键设置与窗体热键设置实例

1、窗体热键

首先要设置主窗体KeyPreview为true,可直接在属性中进行设置,
或者在窗体加载中设置: this.KeyPreview = true;
然后添加窗体KeyDown事件,如下:

private void FrmMain_KeyDown(object sender, KeyEventArgs e)  
{  
    if (e.Alt && e.Shift && e.Control && e.KeyCode == Keys.S)  
    {  
 MessageBox.Show("我按了Control +Shift +Alt +S");  
    }  
}  

2、全局热键设置

定义API函数 》 注册热键 》 卸载热键

我这里定义了AppHotKey类,全部代码如下:

public class AppHotKey  
{  
        [DllImport("kernel32.dll")]  
        public static extern uint GetLastError();  
        //如果函数执行成功,返回值不为0。  
        //如果函数执行失败,返回值为0。要得到扩展错误信息,调用GetLastError。  
        [DllImport("user32.dll", SetLastError = true)]  
        public static extern bool RegisterHotKey(  
            IntPtr hWnd,                //要定义热键的窗口的句柄  
            int id,                     //定义热键ID(不能与其它ID重复)            
            KeyModifiers fsModifiers,   //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效  
            Keys vk                     //定义热键的内容  
            );  
  
        [DllImport("user32.dll", SetLastError = true)]  
        public static extern bool UnregisterHotKey(  
            IntPtr hWnd,                //要取消热键的窗口的句柄  
            int id                      //要取消热键的ID  
            );  
  
        //定义了辅助键的名称(将数字转变为字符以便于记忆,也可去除此枚举而直接使用数值)  
        [Flags()]  
        public enum KeyModifiers  
        {  
            None = 0,  
            Alt = 1,  
            Ctrl = 2,  
            Shift = 4,  
            WindowsKey = 8  
        }  
        /// <summary>  
        /// 注册热键  
        /// </summary>  
        /// <param name="hwnd">窗口句柄</param>  
        /// <param name="hotKey_id">热键ID</param>  
        /// <param name="keyModifiers">组合键</param>  
        /// <param name="key">热键</param>  
        public static void RegKey(IntPtr hwnd, int hotKey_id, KeyModifiers keyModifiers, Keys key)  
        {  
            try  
            {  
                if (!RegisterHotKey(hwnd, hotKey_id, keyModifiers, key))  
                {  
                    if (Marshal.GetLastWin32Error() == 1409) { MessageBox.Show("热键被占用 !"); }  
                    else  
                    {  
                        MessageBox.Show("注册热键失败!");  
                    }  
                }  
            }  
            catch (Exception) { }  
        }  
        /// <summary>  
        /// 注销热键  
        /// </summary>  
        /// <param name="hwnd">窗口句柄</param>  
        /// <param name="hotKey_id">热键ID</param>  
        public static void UnRegKey(IntPtr hwnd, int hotKey_id)  
        {  
            //注销Id号为hotKey_id的热键设定  
            UnregisterHotKey(hwnd, hotKey_id);  
        }  
}  

重写窗体的WndProc函数,在窗口创建的时候注册热键,窗口销毁时销毁热键,代码如下:

private const int WM_HOTKEY = 0x312; //窗口消息-热键  
private const int WM_CREATE = 0x1; //窗口消息-创建  
private const int WM_DESTROY = 0x2; //窗口消息-销毁  
private const int Space = 0x3572; //热键ID  
protected override void WndProc(ref Message m)  
{  
    base.WndProc(ref m);  
    switch (m.Msg)  
    {  
 case WM_HOTKEY: //窗口消息-热键ID  
     switch (m.WParam.ToInt32())  
     {  
  case Space: //热键ID  
      MessageBox.Show("我按了Control +Shift +Alt +S");  
      break;  
  default:  
      break;  
     }  
     break;  
 case WM_CREATE: //窗口消息-创建  
     AppHotKey.RegKey(Handle, Space, AppHotKey.KeyModifiers.Ctrl | AppHotKey.KeyModifiers.Shift | AppHotKey.KeyModifiers.Alt, Keys.S);  
     break;  
 case WM_DESTROY: //窗口消息-销毁  
     AppHotKey.UnRegKey(Handle, Space); //销毁热键  
     break;  
 default:  
     break;  
    }  
}