当子控件接收到键盘消息时由子控件调用该方法。

This method is called by a child control when the child control receives a keyboard message.

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其应用方法有按键开关法、键盘消息法和鼠标消息法。

The application method includes button switch method, keyboard information method and mouse information method.

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说明：使用钩子限制键盘功能的实例，可以中断键盘消息响应。

Use the hook restrictions keyboard function instance, you can interrupt keyboard response.

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