Why do structures need to be told how big they are?

2021-03-25 13:30:13分类：常见问题 / CSS3 答疑阅读(31)评论(0)

I've noticed that in c/c++ a lot of Win32 API structs need to be told how big they are. i.e `someStruct.pbFormat = sizeof(SomeStruct)` Why is this the case? Is it just for legacy reasons? Also any idea what "pb" stands for too? EDIT: oops, yeah I meant "cbFormat"

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