[gdal-dev] PNG usage issues

[Chaitanya kumar CH]

Sam,

This looks like a PNG issue rather than a GDAL one. FYI, versions of libpng
used are libpng1.2.15 in GDAL1.6 and libpng1.2.35 in GDAL trunk. You may
also want to checkout libpng.org

Best regards,
-- 
Chaitanya kumar CH.

On Fri, Jul 31, 2009 at 1:42 PM, <ariasgore at gmx.de> wrote:

> Hello,
>
> we have been using an old gdal version (1.0.x) with our projects, there was
> the png support compiled into the gdal library. Dependency Walker proved
> there were global png_* functions in the gdal library (.dll at this point)
>
> Due to some issues with png I had to update the png format directory and
> replaced all old png lib files with new ones (the gdal version remained
> unchanged)
> but now the compiled lib does not contain any png related functions
> anymore.
>
> Same goes for the latest gdal 1.6.x version.
>
> I was trying to read a png file by including
> png/pngdataset.h which is provided by gdal. during compile and link-time
> this action fails with unresolved symbol errors (in VC it's LNK2019).
> Missing functions are png_create_struct and so on, basically it looks like
> even if the nmake.opt should build and include png as internal lib, there
> are no functions exported with it.
>
> nmake and everything else have been left with their default values, so I
> dont get, how gdal is supposed to handle png now.
>
> Thanks
> Sam
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