原帖及讨论：http://bbs.bc-cn.net/dispbbs.asp?boardid=117&id=99964

[DllImport("user32")]
public static extern bool RegisterHotKey(IntPtr hWnd,int id,uint control,Keys vk );

註冊熱鍵的api

[DllImport("user32")]
public static extern bool UnregisterHotKey(IntPtr hWnd,    int id);

解除註冊

private void Form2_Load1(object sender, System.EventArgs e)
{
            RegisterHotKey(this.Handle,888,2,Keys.A);
            //handle:這個窗體的handle   888:這個熱鍵的標誌id    2:crtl鍵   A: a鍵
}

private void Form2_Load1(object sender, System.EventArgs e)
{
             UnregisterHotKey(this.Handle,888);    
            //handle:這個窗體的handle   888:上面那個熱鍵的標誌id  
}


protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x0312:    //這個是window消息定義的   註冊的熱鍵消息
                    if(m.WParam.ToString().Equals("888"))  //如果是我們註冊的那個熱鍵
                        MessageBox.Show("你按了ctrl+a");
                    break;
            }            
            base.WndProc (ref m);
        }


None = 0,
Alt = 1,
crtl= 2,  
Shift = 4,
Windows = 8

這是熱鍵的定義  alt+crtl是3  直接相加就可以了




如果用sendmessagea這個api  就是

SendMessage(this.Handle,WM_SETHOTKEY,0x45a, 0)

//WM_SETHOTKEY 是 0x32
//0x45a    高字節是contrl鍵  低字節是a b c d   所以5a是z的ascii   4是alt  也就是alt+z