[Qt-interest] How to use my own static lib in another project?

[xiaolei Shang]

>
>
>  thank you for your reply.
>
>  I  edit my code , incude the "settings_global.h" file generated by vs 
> qt project template, and add "SETTINGS_LIB" to "DEFINES" section
>
>     #ifdef SETTINGS_LIB
>     # define SETTINGS_EXPORT Q_DECL_EXPORT
>     #else
>     # define SETTINGS_EXPORT Q_DECL_IMPORT
>     #endif
>
>
>  but it still does not work when I use the lib file in another 
> project, the error message is :
>
>     error LNK2019: unresolved external symbol "__declspec(dllimport)
>     public: __declspec(dllimport) public: __thiscall
>     Settings::Settings(void)" (__imp_??0Settings@@QAE at XZ) referenced
>     in function _main 
>
>
> can you help me ? ;-( 
Hi:

In your "settings_global.h", before the code you mentioned above, to do:

#ifdef WIN32
  #define Q_DECL_IMPORT __declspec(dllimport)
  #define Q_DECL_EXPORT __declspec(dllexport)

In other classes which you wish to be exported, to use SETTINGS_EXPORT 
rather than Q_DECL_EXPORT. Take your case as example:

#include "settings_global.h"
class SETTINGS_EXPORT Settings : public QObject
{
...
};

Hope it helps.

Cheers

Xiaolei