Sam,<br><br>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 <a href="http://libpng.org">libpng.org</a><br>
<br>Best regards,<br>
-- <br>Chaitanya kumar CH.<br><br><div class="gmail_quote">On Fri, Jul 31, 2009 at 1:42 PM, <span dir="ltr"><<a href="mailto:ariasgore@gmx.de">ariasgore@gmx.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hello,<br>
<br>
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)<br>
<br>
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)<br>
but now the compiled lib does not contain any png related functions anymore.<br>
<br>
Same goes for the latest gdal 1.6.x version.<br>
<br>
I was trying to read a png file by including<br>
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).<br>
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.<br>
<br>
nmake and everything else have been left with their default values, so I dont get, how gdal is supposed to handle png now.<br>
<br>
Thanks<br>
Sam<br>
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