Importing classes from WIndows DLLs

/!\ This is a work in progress...

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What do we want to achieve

During the work on my school's final work I had to "steal" some functionality from binary-only Windows DLLs which were unfortunately written in C++ (object-oriented). Since there is no real standard in how methods/classes should be exported I've found myself in quite hopeless situation.

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How to achieve that