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

[Yao Huiji]

thank you , but it's already in the "qglobal.h",and I have checked my
"Preprocessor Definitions", they are all defined.

*settings_global.h*:

> #ifndef SETTINGS_GLOBAL_H
> #define SETTINGS_GLOBAL_H
>
> #include <Qt/qglobal.h>
>
> #ifdef SETTINGS_LIB
> # define SETTINGS_EXPORT Q_DECL_EXPORT
> #else
> # define SETTINGS_EXPORT Q_DECL_IMPORT
> #endif
>
> #endif // SETTINGS_GLOBAL_H
>

*Preprocessor Definitions:*

> UNICODE,WIN32,QT_THREAD_SUPPORT,QT_CORE_LIB,QT_XML_LIB,UTILITY_LIB
>

2009/5/20 xiaolei Shang <xiaolei.shang at esrtechnology.com>

>
>
>>
>>  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
>
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