Howto: Use exported dll library functions in Qt

Hi,

I cannot figure out how to use functions from a 3rd party library for which I have the header file and the *.dll. The linker seems to have some problems which I cannot decipher. I have attached the header file and an I make ca call in my QtCode where I include the header file as follows:

Code:

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struct iaxc_audio_device *devices;
	int devNumber,input,output,ring;
	long devCapabilities;
        int result = iaxc_audio_devices_get(&devices, &devNumber, &input, &output, &ring);

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My make gives the following output:

Code:

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g++ -mthreads -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -Wl,-s -Wl,-subsystem,windows -o "release\YakaPhone.exe" release\qrc_icons.o release\main.o release\mainwindow.o release\settingsdialog.o release\moc_mainwindow.o release\moc_settingsdialog.o  -L"C:\Programme\Qt\4.1.2\lib" -lmingw32 -lqtmain -L"D:/Downloads/Tools/IDEs/Eclipse
/eclipse/workspace/YakaPhone/lib" -lQtGui4 -lQtCore4
release\settingsdialog.o(.text+0x8e):settingsdialog.cpp: undefined reference to `iaxc_audio_devices_get'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\YakaPhone.exe] Error 1
mingw32-make[1]: Leaving directory `D:/Downloads/Tools/IDEs/Eclipse/eclipse/workspace/YakaPhone'
mingw32-make: *** [release] Error 2

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Any clue how to reconfigure my project to make this work?
Thanks for ur help.
Roland (Newbie)

Either use QLibrary or create an import library for that DLL as described in the MinGW FAQ.

1) check you have a devel version (find an import lib : *.a or *.lib)
if the lib is *.a goes to step 2 straightaway

1) if the lib is *.lib (M$VC format) use reimp (mingw tools, use it via command line) to convert it in a mingw compatible import lib i.e *.a file

2) add the following line to your project :

Code:

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LIBS += ../../lib/libXXX.a

---

where "../../lib/libXXX.a" is just an example path, use the one of your library

3) qmake then mingw32-make