The platform calls the message handling function of this message processing object whenever any event occurs that your program might possibly want to be notified about.
当发生任何需要通知给您的程序的事件时，平台将调用这个消息处理对象的消息处理功能。
The platform calls the message handling function of this message processing object whenever any event occurs that your program might possibly want to be notified about.
当发生任何需要通知给您的程序的事件时，平台将调用这个消息处理对象的消息处理功能。
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