[pjsip] Building pjsua as DLL

Benny Prijono bennylp at pjsip.org
Fri Nov 16 20:47:08 EST 2007


Yes, that's correct. Thanks for clarifying this.

In addition, if you're linking your application with the DLL version 
of the libraries, and if you have C or C++ application, you need to 
declare PJ_DLL macro (and not PJ_EXPORTING) in your application's 
project, to activate __declspec(dllimport) specifier in PJ's 
declarations.

cheers,
  -benny

Tomás Valenta wrote:
> Hi Roland,
> yeah, this is an old recommendation. It might work as well, but now you 
> don't have to modify any source. Setting project type to DLL and declaring 
> macros PJ_DLL and PJ_EXPORTING at projects (i.e. pjlib, pjmedia, ...) whose 
> functions you want to use is enough. Resulting DLL works fine.
> Cheers
>     Vali
> 
> 
> ----- Original Message ----- 
> From: "Roland Klabunde" <roland.klabunde at freenet.de>
> To: "pjsip embedded/DSP SIP discussion" <pjsip at lists.pjsip.org>
> Sent: Friday, November 16, 2007 2:48 PM
> Subject: Re: [pjsip] Building pjsua as DLL
> 
> 
> May I ask that again?
> 
> Regards
> 
> ----- Original Message ----- 
> From: "Roland Klabunde" <roland.klabunde at freenet.de>
> To: "pjsip embedded/DSP SIP discussion" <pjsip at lists.pjsip.org>
> Sent: Friday, November 16, 2007 9:20 AM
> Subject: Re: [pjsip] Building pjsua as DLL
> 
> 
> Hello guys,
> 
> I've found a rather old recommendation from Benny in my notes about how to
> build a DLL, which I used a year ago or so in order to build DLLs:
> 
> <snip>
> 
> 
> Next, you'd need to modify pjsua.h. Just below PJ_BEGIN_DECL line, add
> 
> this snippet:
> 
> 
> 
> #if defined(PJ_EXPORTING) && PJ_EXPORTING!=0
> 
> # undef PJ_DECL
> 
> # undef PJ_DEF
> 
> # define PJ_DECL(T)    __declspec(dllexport) T
> 
> # define PJ_DEF(T)    PJ_DECL(T)
> 
> #elif defined(PJ_IMPORTING) && PJ_IMPORTING!=0
> 
> # undef PJ_DECL
> 
> # undef PJ_DEF
> 
> # define PJ_DECL(T)    __declspec(dllimport) T
> 
> # define PJ_DEF(T)    PJ_DECL(T)
> 
> #endif
> 
> 
> 
> Next, add PJ_EXPORTING=1 macro in the DLL project settings.
> 
> 
> 
> Build the project, and you'll get the DLL.
> 
> 
> 
> I haven't tried loading the DLL myself, but if you have any problems,
> 
> then perhaps you need to implement DllMain() function.
> 
> 
> 
> cheers,
> 
> -benny
> 
> 
> 
> 
> 
> </snip>
> 
> Because I already handed over the project to a colleague, who reported
> problems to rebuild the DLLs using one of the latest SVN revs: Is the
> recommendation above still OK, or did it change? If yes, how is the way to
> build a DLL now?
> 
> Kind regards
> 
> 
> 
> ----- Original Message ----- 
> From: "Benny Prijono" <bennylp at pjsip.org>
> To: "pjsip embedded/DSP SIP discussion" <pjsip at lists.pjsip.org>
> Sent: Friday, November 16, 2007 4:51 AM
> Subject: Re: [pjsip] Building pjsua as DLL
> 
> 
> 
> Thanks for testing it, Vali. I've committed the change in SVN.
> 
> cheers,
>   -benny
> 
> Tomás Valenta wrote:
>> Thank you, it does work! And it is smart. I could not find this because
>> Intellisense keep telling me that the source is C++ (__cplusplus defined;
>> I was playing only with this branch of macros) but it is compiled as ANSI
>> C.
>> Strange.
>> Cheers
>>     Vali
>>
>>
>> ----- Original Message ----- 
>> From: "Benny Prijono" <bennylp at pjsip.org>
>> To: "pjsip embedded/DSP SIP discussion" <pjsip at lists.pjsip.org>
>> Sent: Wednesday, November 14, 2007 4:45 AM
>> Subject: Re: [pjsip] Building pjsua as DLL
>>
>>
>> Thanks for the info. Can I ask for a favor to try out these patch?
>>
>> What if instead of commenting out PJ_EXPORT_DEF_SPECIFIER, we change
>> the PJ_DECL_NO_RETURN declaration in pj/config.h to something like this:
>>
>> #ifdef __cplusplus
>> #  define PJ_DECL_NO_RETURN(type)   PJ_DECL(type) PJ_NORETURN
>> #else
>> #  define PJ_DECL_NO_RETURN(type)   PJ_NORETURN PJ_DECL(type)
>> #endif
>>
>> Does this work for your DLL?
>>
>> If it does, I would prefer this approach since the empty
>> PJ_EXPORT_DEF_SPECIFIER may not work for other platforms (such as
>> Symbian, which IIRC expects the export specification in the
>> definition rather than in declaration).
>>
>> cheers,
>>   -benny
> 
> 
> 
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-- 
Benny Prijono
http://www.pjsip.org





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