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How to call a function by pointer in a struct from a shared library?

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Pet Bzz
Pet Bzz 2019-3-13
Hello.
I try to use a third-party shared library. It has a function, which returns a structure. This structure contains a function pointer. I don't understand how to call it. And loadlibrary shows warnings like this:
"The data type ' ULONG ( * AddRef ) ( IVciFifo * This ) ' used by structure IVciFifoVtbl does not exist. The structure
may not be usable"
Please, help

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