Build and run your application. The edit control will have a yellow background.
编译并运行您的程序，该编辑控件将显示一个黄色的背景。
The EN_UPDATE notification message is sent when an edit control is about to redraw itself.
当编辑框要重划自身时会发送这一消息。
The EN_UPDATE notification message is sent when an edit control is about to redraw itself.
当编辑框要重划自身时会发送这一消息。
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