How to use tlb files in your own C ++ project

I have tlb files containing some function declaration that I need to use.

If i use

#import "type_library.tlb"

I can correlate the function link from my code:

tlb_namespace::required_function();

But when I compile the project, the linker says that tlb_namespace :: required_function is an unresolved external character.

How can I successfully build such a project?

EDIT :

I used a library of the same type in a Dummy VBA access project. I added a link to the type library, and I noticed that some function contained in the type library is being called correctly. But some of them are not. VBA says that it cannot find its entry point in the corresponding DLL.

Can this explain the unresolved external character when creating a C ++ application?

, failing ​​ tlb :

UPPER_function_name

dll :

UPPER_function_name

?

, tlb dll?