Re: [Jack-Devel] Windows dev: error linking libjack64.lib

Is this "jack_get_version_string" symbol the only one from the JACK API that causes a link error?

Stéphane

Le 17 janv. 2013 à 12:30, Julien Rosener a écrit :

> Hello,
> 
> I am trying to port an application using Jack from Linux to Windows. I
> have an issue when linking with libjack64.
> 
> My development environment is Windows 7 64 bits + QtCreator (using
> Visual Studio 10.0 as compiler/linker).
> 
> I installed Jack binaries for Windows and found Jack\lib\libjack64.lib
> and C:\Windows libjack64.dll.
> I would like to use these 2 files to link with Jack, for that I wrote
> a small exemple with QtCreator.
> 
> [.pro]
> This is the part about lib linking (.lib and .dll are in
> jack-1.9.9/lib/, .h are in jack-1.9.9/includes) :
> 
> win32: LIBS += -L$$PWD/jack-1.9.9/lib/ -llibjack64
> INCLUDEPATH += $$PWD/jack-1.9.9/includes
> DEPENDPATH += $$PWD/jack-1.9.9/includes
> 
> [.cpp]
> #include <jack/jack.h>
> int main(int argc, char *argv[])
> {
>   QApplication a(argc, argv);
>   QLabel versions;
> 
>   // get jack version
>   versions.setText(QString("libjack v") + QString(jack_get_version_string()));
> 
>   versions.show();
>   return a.exec();
> }
> 
> [Build error]
> Compilation is OK, but link stage fails with:
> "main.obj : error LNK2019: unresolved external symbol
> _jack_get_version_string referenced in _main"
> 
> [Comments]
> I do not understand why it is failling because I am always doing
> successfully like that with other libs, I have got suppositions :
> - some paths are wrong ?
> - should I link statically instead of dynamically ?
> - libjack64.lib was not compiled with a MSVC compiler and so I can't
> link using MSVC ?
> - is it a QtCreator related issue ?
> 
> If it is not possible (for some reasons) to link against
> libjack64.lib, would it be a good solution to load only libjack64.dll
> at runtime using LoadLibrary("libjack64.dll") ?
> Another solution is to recompile Jack on Windows but I only have
> Visual Studio 2012 express which seems not to be supported according
> to the REAMDE in Windows source directory.
> 
> I am definitely not a Windows developer, so maybe I just do not
> understand nicely how DLL linking is working.
> 
> Do you have any idea what is the best way to link libjack64 using MSVC
> compiler ?
> 
> Bests,
> Julien.
> 
> Jack-Devel mailing list
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