The EN_MAXTEXT notification message is sent when the current text insertion has exceeded the specified number of characters for the edit control. The text insertion has been truncated.
当编辑框中的文本超过了指定字符数时，文本将被截断，同时父窗口收到此消息。
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。
The EN_SETFOCUS notification message is sent when an edit control receives the keyboard focus. The parent window of the edit control receives this notification message through a WM_COMMAND message.
当编辑框获得键盘焦点时（即编辑框由无光标变成有光标在闪烁时），父窗口收到这一消息。
The EN_SETFOCUS notification message is sent when an edit control receives the keyboard focus. The parent window of the edit control receives this notification message through a WM_COMMAND message.
当编辑框获得键盘焦点时（即编辑框由无光标变成有光标在闪烁时），父窗口收到这一消息。
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