Exiv2

There's a FAQ for this:
http://dev.exiv2.org/projects/exiv2/wiki/FAQ

The actual page with the information is at:
http://clanmills.com/exiv2/mingw.shtml

I compile exiv2 for windows.
But when I link my program with libexiv2.a I get errors:
undefined reference to '_img___N5Exiv212ImageFactory4openERKSs'
undefined reference to '_img___N5Exiv25Value8tostringEv'
What is this or where is my mistake?

Aleksandr:

I've just built the library sample/exifprint using the terminal.

$ tar xf exiv2-0.21.1.tar.gz
$ cd exiv2-0.21.1
$ ./configure --disable-visibility
$ make clean
$ make
$ make install
$ cd samples
$ g++ -c exifprint.cpp -o exifprint.o -I/usr/local/include
$ g++ exifprint.o -o exifprint.exe -lexiv2 -L/usr/local/lib
$ cp /usr/local/bin/*.dll .
$ ./exifprint.exe /c/Users/rmills/R.jpg

Copying the dlls from /usr/local/bin isn't nice. Much better to extend the PATH:

$ del *.dll
$ export PATH=$PATH:/usr/local/lib:/usr/local/bin
$ ./exifprint.exe  ~/R.jpg

1. -I/usr/local/include on the compilation of exifprint.cpp
2. -L/usr/local/lib on the link of exifprint.exe

There was a discussion earlier this year about using QtCreator (which uses the MinGW toolchain). QtCreator provides a nice IDE. You'll have to specify the include and library path's is in the .pro file:

win32 {
    DEFINES      += __WINDOWS__=1
    INCLUDEPATH  += $$quote(C:/MinGW/msys/1.0/local/include)
    LIBS         += $$quote(C:/MinGW/msys/1.0/local/lib/libexiv2.dll.a)
}

I hope that helps.

Robin

So, I solve problem.
I use in Linux:
./configure --prefix=/usr/i586-mingw32msvc
make
And use libexiv2-10.dll
But how to use static library I don't know.

Aleksandr

I haven't understood what Linux has to do with this.

You'll have to build/install the static version of the library (its dependents expat and zlib and probably libiconv and libintl). To build the static exiv2 library:

$ ./configure --enable-static --disable-shared --disable--visibility
$ make clean ; make ; make install

$ g++ -c exifprint.cpp -o exifprint.o -I/usr/local/include
$ g++ exifprint.o -o exifprint.exe -lexiv2 -lexpat -liconv -lz -lintl -L/usr/local/lib
$ ls -alt *.exe
-rwxr-xr-x+ 1 rmills root 2397209 May 27 10:18 exifprint.exe

Please be aware that you have only linked the static version of exiv2 - you have still linked the DLLs for some of the other libraries. There's a little utility msvc/depends2.exe which reveals the DLLs required by a program (the source is in the exiv2 repository).

$ ../msvc/depends2.exe exifprint.exe
cygexpat-1.dll
cygstdc++-6.dll
cygz.dll
cygintl-8.dll
cyggcc_s-1.dll
cygiconv-2.dll
Secur32.dll
RPCRT4.dll
ntdll.dll
KERNEL32.dll
ADVAPI32.DLL
cygwin1.dll
exifprint.exe
$

If you wish to link with another static library (eg /usr/local/lib/libexpat.a), you can declare it when you link. As you'll see below, this has removed the depenancy of exifprint.exe on cygexpat-1.dll and made exifprint.exe larger.

$ g++ exifprint.o -o exifprint.exe -lexiv2 /usr/local/lib/libexpat.a -liconv -lz -lintl -L/usr/local/lib
$ ls -alt exifprint.exe
-rwxr-xr-x+ 1 rmills root 2735438 May 27 10:37 exifprint.exe
$ ../msvc/depends2.exe  exifprint.exe
cygstdc++-6.dll
cygz.dll
cygintl-8.dll
cyggcc_s-1.dll
cygiconv-2.dll
Secur32.dll
RPCRT4.dll
ntdll.dll
KERNEL32.dll
ADVAPI32.DLL
cygwin1.dll
exifprint.exe
$

If I still haven't answered your question, then please provide more information about what you are doing.

Many thanks for the help.