调用这个函数以获得与窗口相关的帮助上下文标识符，如果有的话。

Call this member function to retrieve the help context identifier, if any, associated with the window.

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如果子窗口不具有帮助上下文标识符，则它继承它的父窗口的标识符。

Likewise, if an owned window does not have a help context identifier, it inherits the identifier of its owner window.

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检索库的文档字元串、完整的帮助文件名和路径以及帮助文件中的库帮助主题的上下文标识符。

Retrieves the librarys documentation string, the complete help file name and path, and the context identifier for the library help topic in the help file.

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