Load objects from dynamic library

[Trok]

Hi, I want load objects with dynamic library without result ;/
I add in *.pro file:

LIBS += -Lpath -lname

LIBS += -Lpath -lname

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and in *.cpp or *.h

extern "C" class __declspec(dllimport) testclass{};

extern "C" class __declspec(dllimport) testclass{};

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It doesn't work. Why? Does it good prepare?