防止全局键盘挂钩上的默认设置

Question

I am using this Global Keyboard Hook as found here: Using global keyboard hook (WH_KEYBOARD_LL) in WPF / C#

It works great, and I use a little piece of code to handle the keydown event.

private void Klistener_KeyDown(object sender, RawKeyEventArgs e)
{
    if (e.Key == Key.Snapshot)
    {
        MessageBox.Show("Key Pressed!");
    }
}

However, any other handlers tied to Key.Snapshot will still work. For instance Windows default for the key will print screen and save it into the clipboard, what if I didn't want any other actions happening after my handler?

I'm not entirely fluent in the Keyboard Hook I am using, but I'm sure there must be a way to implement a e.Handled property or something similar as can be found in KeyEventArgs.

Any ideas how I would go about doing this? Thanks.

Answer 1

The MSDN says :

If the hook procedure processed the message, it may return a nonzero value to prevent the system from passing the message to the rest of the hook chain or the target window procedure.

So you would need to just return 1 in LowLevelKeyboardProc if the desired key was pressed. Otherwise you return the call to CallNextHookEx