一个消息发射和接收的源码,只要在相应的窗口类中定义并注册一个消息,在任何其他类的任何地方发射消息,都会启动你自己定义的消息函数.-A message transmitting and receiving the source code, as long as the window in the corresponding class definition and registration of a message, in any other type of information anywher