它们并不理解窗口和剪贴区域，这意味着视频窗口要始终处于显示端的顶层。
They don't understand Windows and clipping rectangles, which means that the video window is always on top of the display.
如果函数执行成功，则返回当前打开剪贴板的窗口的句柄；否则返回NULL。
The handle of the window that currently has the Clipboard open if the function is successful; otherwise NULL.
剪贴板用于在窗口或应用程序之间传递数据。
The clipboard is used to transfer data between Windows or applications.
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