I have a third party lib, I have error LNK2019: unresolved external … How to investigate to fix it?

When you get an "unresolved external" error from the linker, that means that it was looking for a match for a function or variable name that some object file needs and the linker was unable to find that name defined in one of the object files or libraries.

You can try to use dependencywalker to see the list of dependencies for your dlls and see what it's missing.

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