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.
一旦接收到该钩子代码，CBT应用程序必须安装一个WH_JOURNALPLAYBAC钩子来响应键盘消息。
Upon receiving this hook code, a CBT application must install a WH_JOURNALPLAYBACK hook procedure in response to the keyboard message.
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