Building DCMTK 3.6 with PNG 1.5.1

[Bob666]

Hi all

I can't build DCMTK 3.6.0 with the new PNG 1.5.1 on Win7 x64. If I use PNG 1.4, there's no problem. The problem is, 3 projects can't link because they can't find the png functions:

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1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_write_end
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_write_image
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_write_info
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_set_tIME
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_convert_from_time_t
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_set_text
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_set_IHDR
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_init_io
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_set_longjmp_fn
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_destroy_write_struct
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_create_info_struct
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_create_write_struct
1>dcmimage.lib(dipipng.obj) : error LNK2001: unresolved external symbol png_access_version_number
1>D:\CMake_Build\DCMTK\dcmjpeg\apps\Release\dcmj2pnm.exe : fatal error LNK1120: 13 unresolved externals

The library name and path are correct in the linker settings... Has anyone a solution for this?

Thank you
Robert

[Jörg Riesmeier]

No, we haven't tried libpng 1.5.1 yet. However, I can't imagine that the authors changed the complete API. Did you compile libpng 1.4.x with the same compiler settings?

[Bob666]

No, I don't think they changed everything, the made the API more consistent, but there's also a new header file to include.. So there are some changes...

Yes, I compiled it more or less the same way, the compiler and linker settings should be the same and should match DCMTK.

[Chung-Yueh Lien]

Hi, I just make a test to create the win32 libaray of PNG-1.5.1 and compile with DCMTk 3.6.0. There is no such a problem. Please check the settings of scripts/makefile.vcwin32 in PNG project. Because the linking process needs pnglibconf.h which is automatically created in make process. However, there is a little bit error in default. You can fix it by following steps.

Change this line in makefile

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cp scripts/pnglibconf.h.prebuilt $@

as:

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copy /b scripts\pnglibconf.h.prebuilt$@

as well as set the path of zlib correctly and then type:

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nmake /f scripts\makefile.vcwin32

Finally, you will create the new library that can be used in DCMTK-3.6.0.

[Bob666]

Hi

Thanks for the tipps, I solved it with using CMake to create solution files instead of using the solution files provided by libpng... looks like a compiler or linker setting wasn't as DCMTK wants it to be...

Thanks to all