Register more than one hotkey with RegisterHotKey

问题:

I found this little piece of code to register an hotkey:

    [DllImport("user32.dll")]
    public static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == 0x0312)
            MessageBox.Show("Hotkey pressed");
        base.WndProc(ref m);
    }

    public FormMain()
    {
        InitializeComponent();
        //Alt + A
        RegisterHotKey(this.Handle, this.GetType().GetHashCode(), 1, (int)'A');
    }

It works perfectly, but my problem is I want to use two different shortcuts. I know the second parameter is the id, so I figure I could make a different id and add a new if statement in the WndProc function but I'm not sure how I would go about that.

In short, how would I go about creating a second shortcut?

Thanks,

回答1:

 RegisterHotKey(this.Handle, this.GetType().GetHashCode(), 1, (int)'A')

Don't use GetHashCode() here. Just number your hot keys, start at 0. There isn't any danger of getting the ids mixed up, hot key ids are specific for each Handle. You'll get the id back in the WndProc() method. Use m.WParam.ToInt32() to get the value:

protected override void WndProc(ref Message m)
{
    if (m.Msg == 0x0312) {    // Trap WM_HOTKEY
        int id = m.WParam.ToInt32();
        MessageBox.Show(string.Format("Hotkey #{0} pressed", id));
    }
    base.WndProc(ref m);
}