注册系统热键

/// <summary>
        /// Defines a system-wide hot key.
        /// </summary>
        /// <param name="hWnd">A handle to the window that will receive WM_HOTKEY messages generated by the hot key. If this parameter is NULL, WM_HOTKEY messages are posted to the message queue of the calling thread and must be processed in the message loop.</param>
        /// <param name="id">The identifier of the hot key. If the hWnd parameter is NULL, then the hot key is associated with the current thread rather than with a particular window. If a hot key already exists with the same hWnd and id parameters, see Remarks for the action taken.</param>
        /// <param name="fsModifiers">The keys that must be pressed in combination with the key specified by the uVirtKey parameter in order to generate the WM_HOTKEY message. The fsModifiers parameter can be a combination of the following values.</param>
        /// <param name="vk">The virtual-key code of the hot key</param>
        /// <returns>If the function succeeds, the return value is nonzero.</returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, Modifiers fsModifiers, Keys vk);//注册函数
        /// <summary>
        /// Frees a hot key previously registered by the calling thread.
        /// </summary>
        /// <param name="hWnd">A handle to the window associated with the hot key to be freed. This parameter should be NULL if the hot key is not associated with a window.</param>
        /// <param name="id">The identifier of the hot key to be freed.</param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);//接触注册函数
        public const int WM_HOTKEY = 0x0312;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnUnregister_Click(object sender, EventArgs e)
        {
            UnregisterHotKey(this.Handle, 8080);  //8080:热键的标志id   
        }
        private void btnRegister_Click(object sender, EventArgs e)
        {
            RegisterHotKey(this.Handle, 8080, Modifiers.MOD_CONTROL, Keys.C);  //8080:热键的标志id    2:crtl   A: C 
        }
        protected override void WndProc(ref Message m)
        { 
            switch (m.Msg)
            {
                case WM_HOTKEY:    //window消息定义的註冊的热键消息 
                    if (m.WParam.Equals((IntPtr)8080))
                        MessageBox.Show("你按了ctrl+C");
                    break;
            }
            base.WndProc(ref m);
        }
    }

    public enum Modifiers : uint
    {
        /// <summary>
        /// Either ALT key must be held down.
        /// </summary>
        MOD_ALT = 0x0001,
        /// <summary>
        /// Either CTRL key must be held down.
        /// </summary>
        MOD_CONTROL = 0x0002,
        /// <summary>
        /// Changes the hotkey behavior so that the keyboard auto-repeat does not yield multiple hotkey notifications.
        /// Windows Vista and Windows XP/2000:  This flag is not supported.
        /// </summary>
        MOD_NOREPEAT = 0x4000,
        /// <summary>
        /// Either SHIFT key must be held down.
        /// </summary>
        MOD_SHIFT = 0x0004,
        /// <summary>
        /// Either WINDOWS key was held down. These keys are labeled with the Windows logo. Keyboard shortcuts that involve the WINDOWS key are reserved for use by the operating system.
        /// </summary>
        MOD_WIN = 0x0008
    }