《Delphi精要》P134页中提到消息处理有8个方法,现在对上面的方法,做一个实验。
第1是onmessage方法:application中的onmessage方法可以处理属于application的除WM_QUIT以外的所有消息。但该方法用于处理个别方法时,效率会很低,因为需要对WINDOWS中的众多的消息中筛选其中之一。
下面还比较了sendMessage与PostMessage两个方法的区别:SendMessage发送的消息进入了窗体而没有进入消息队列的(这一点还要深究)。Application无法识别没有进入消息队列的消息的。所以OnMessage不能截获该消息。
从图中可以看到SendMessage是没有响应的。
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