Question

I have a VC++ solution with two projects. Project B references project A. Project B also has as Include Directory (Properties/Configuration Properties/C++/Additional Include Directories) the folder from Project A. No namespaces are used.

When i Import the header from a Project A class like #include "someFolder\SomeClass.h" then I’m able to declare a pointer to the class.

SomeClass *sc;

But as soon as i call the constructor it won’t compile. IntelliSense doesn’t show any errors.

SomeClass *sc = new SomeClass("someString");

I get:

error LNK2001: “unresolved external symbol “public_ thiscall SomeClass::SomeClass(…” and “error LNK1120: 1 unresolved externals”.

The constructor is public just like the methods from SomeClass. The funny thing is that I can compile when calling methods from SomeClass in Project B. Only the cunstructor does not seem to work.

Answer 1

You have to link the object code compiled from “SomeClass.cpp”. If Project A compiles to a static library, then add a reference to it.