Importing .dll into Qt

Question

I want to bring a .dll dependency into my Qt project.

So I added this to my .pro file:

win32 {
LIBS += C:\\lib\\dependency.lib
LIBS += C:\\lib\\depe         


        

Answer 1

Your "LIBS +=" syntax is wrong. Try this:

win32 {
    LIBS += -LC:/lib/ -ldependency
}

I'm also not sure if having absolute paths with drive letter in your .pro file is a good idea - I usually keep the dependencies somewhere in the project tree and use relative path.

EDIT:

I suppose that something is wrong in your dll, i.e. the symbols are not exported correctly. I always use template provided by QtCreator:

1. Inside dll project there is mydll_global.h header with code like that:

   #ifdef MYDLL_LIB
       #define MYDLL_EXPORT Q_DECL_EXPORT
   #else
       #define MYDLL_EXPORT Q_DECL_IMPORT
   #endif
   

2. Dll project has DEFINES += MYDLL_LIB inside it's pro file.

3. Exported class (or only selected methods) and free functions are marked with MYDLL_EXPORT inside header files, i.e.

   class MYDLL_EXPORT MyClass {
   
   // ...
   
   };