这个窗口类定义了一个窗口的属性，例如它的风格、标、标指针、单名与窗口过程的名称。

A window class defines the attributes of a window, such as its style, its icon, its cursor, the name of the menu, and the name of the window procedure.

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这个窗口类定义了一个窗口的属性，例如它的风格、标、标指针、单名与窗口过程的名称。

A window class defines the attributes of a window, such as its style, its icon, its cursor, the name of the menu, and the name of the window procedure.

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