此成员函数用来获取子项相对于父项缩进的量。

Call this function to retrieve the amount, in pixels, that child items are indented relative to their parent items.

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该标志指定了树形控件在子项到其相应的父项之间有线连接。

TVS_HASLINES the tree view control has lines linking child items to their corresponding parent items.

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例如，可以使用此属性确定父项是否被选择、选中或具有焦点。

You can use this property, for example, to determine whether the parent item is selected, checked, or focused.

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