指定了要获取的控件或子窗口的标识符。
Specifies the identifier of the control or child window to be retrieved.
你必须在你的父窗口中对所有的子窗口控件分类。
You have to subclass all child window controls in your parent window.
这是很好的利用,如果你想强迫用户保持子窗口最大化。
This is good to use if you want to force users to keep child Windows maximized.
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