MS Visual C++ Linker warnings

[jpn]

Is the problem about building the library which contains SearchEngine or a project which links to that library? It's just that the export macro definition looks insufficient to me. You should export when building the lib and import when using the lib. Try searching the forums for "Q_DECL_EXPORT" and "Q_DECL_IMPORT".

[ChristianEhrlicher]

This means that you link both, searchengine.cpp and searchform.cpp into one library/application. If this is the case there's no need for the import/export macros - just remove them.

[YuriyRusinov]

I try to remove all these macro and receive the same warnings and 4 unresolved externals, search error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall SearchEngine::setTimeRange(class QDateTime const &,class QDateTime const &)" (__imp_?setTimeRange@SearchEngine@@QAEXABVQDateTim e@@0@Z) referenced in function "private: void __thiscall SearchForm::Search(void)" (?Search@SearchForm@@AAEXXZ). SearchForm
has to be member of class SearchEngine and has to contains pointer onto SearchEngine object, if I build library without GUI therefore without any graphical forms, all built ok.

[ChristianEhrlicher]

You really should read what I write

either you build a lib where searchengine.cpp is and leave the export macro like it is [b] or you don't build a lib, put searchengine.cpp into your app and remove the macro. What you currently do is that you have the export macro but also link searchengine.cpp to your app. Look into your pro-File (or whatever buildsystem you use) and you'll see!

[YuriyRusinov]

OK, thanks, I try to research this on examples, because this problem does not arise before despite of linkage with other libraries take place.