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大哥,能不能帮我解释你下面这个宏? #24

@panyaorong

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@panyaorong

#define HandlerFromOverlaped(ptr) ((ExtendHandle*)((char*)ptr - (char*)&((ExtendHandle*)NULL)->_overlapped))
我不明白,这个((ExtendHandle*)NULL)->_overlapped,这个不会有问题么?

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