[DllImport("user32")]
public static extern bool RegisterHotKey(IntPtr hWnd,int id,uint control,Keys vk );
//注冊熱鍵的api
[DllImport("user32")]
public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

private void Form1_Load(object sender, EventArgs e)
{
//注冊熱鍵(窗體句柄,熱鍵ID,輔助鍵,實(shí)鍵)
RegisterHotKey(this.Handle, 888, 2, Keys.A);
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
//注消熱鍵(句柄,熱鍵ID)
UnregisterHotKey(this.Handle, 888);
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x0312: //這個是window消息定義的 注冊的熱鍵消息
if (m.WParam.ToString().Equals("888")) //如果是我們注冊的那個熱鍵
MessageBox.Show("你按了ctrl+a");
break;
}
base.WndProc(ref m);
}