窗口具有在WS _ VISIBLE风格位中指定的可视状态。

A window possesses a visibility state indicated by the WS_VISIBLE style bit.

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当窗口被其它窗口覆盖或被父窗口裁剪时，在具有WS _ VISIBLE风格位的窗口内的绘图将不会显示。

Any drawing to a window that has the WS_VISIBLE style will not be displayed if the window is covered by other Windows or is clipped by its parent window.

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