Global Keyboard Hooks (C#) [duplicate]

问题

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Closed 8 years ago.

Possible Duplicate:
Global keyboard capture in C# application

Can anyone help me setup a global keyboard hook for my application?

I want to set hotkeys (such as Ctrl+S) that can be used when not focused on the actual form.

回答1:

Paul's post links to two answers, one telling you how to implement a hook, and another telling you to call RegisterHotKey. You shouldn't need to install a hook for something as simple as a Ctrl+S hotkey, so call RegisterHotKey instead.

回答2:

Or you can use C#'s MessageFilter. It should work while any control/form from your application's process has focus.

Sample Code:

class KeyboardMessageFilter : IMessageFilter
{
    public bool PreFilterMessage(ref Message m)
    {
        if (m.Msg == ((int)Helper.WindowsMessages.WM_KEYDOWN))
        {
            switch ((int)m.WParam)
            {
                case (int)Keys.Escape:
                    // Do Something
                    return true;
                case (int)Keys.Right:
                    // Do Something
                    return true;
                case (int)Keys.Left:
                    // Do Something
                    return true;
            }
        }

        return false;
    }
}

And than simply add a new MessageFilter to your Application:

Application.AddMessageFilter(new KeyboardMessageFilter());

来源：https://stackoverflow.com/questions/824229/global-keyboard-hooks-c