How to use methods from linked library written in Ansi C?

[porterneon]

Hi all, thanx for reply.
I did static linking in simple project with MainWindow widget only and it works. Than I tryied to do the same in my project (now there is 7 form widgets). I had clined solution, rebuild everything and again undefined references. Everything I have made in the same way. What is wrong?

PS: I solved issue. extern "C" has fixed it.

extern "C"{
#include "edr.h"
}

extern "C"{
#include "edr.h"
}

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