[mapserver-users] Error MsDrawMap Image handling error when using PNG

[Gerhard Völkl]

Hallo,

Thank you for your assistance.

The cause was an older version of the oracle library. With version 19 mapserver can display the png files. 

Goodbye Gerhard


> Am 17.08.2021 um 16:52 schrieb Jeff McKenna <jmckenna at gatewaygeomatics.com>:
> 
> Hi Gerhard,
> 
> It seems to be a problem with the LIBPNG library on your server.  Is "PNG" listed in the response from the command "gdalinfo --formats" ?
> 
> I might also:
> 
> - recompile ZLIB
> 
> - recompile LIBPNG
> 
> (executing 'sudo ldconfig' after each)
> 
> - recompile GDAL (point to your external LIBPNG)
> 
> - test with 'gdalinfo --formats'
> 
> - recompile MapServer
> 
> - test your mapfile with a 'shp2img' command
> 
> 
> -jeff
> 
> 
> 
> -- 
> Jeff McKenna
> GatewayGeo: Developers of MS4W, MapServer Consulting and Training
> co-founder of FOSS4G
> http://gatewaygeo.com/
> 
> 
> 
>> On 2021-08-12 7:15 a.m., Gerhard Völkl wrote:
>> Hello,
>> when using a png image as symbol I got the error
>> Image handling error
>> When using a gif image all is fine.
>> But I can’t change all 1000 Images to gif.
>> What can I do? Whatˋs wrong?
>> Here an example Output:
>> /usr/lib/cgi-bin/mapserv QUERY_STRING="map=/data/ows/maps/test.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=725521.7,5433653.4,726708.5,5434495.5&CRS=EPSG:25832&WIDTH=1048&HEIGHT=317&LAYERS=test&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE"
>> libpng error: bad parameters to zlib
>> Content-Type: text/xml; charset=UTF-8
>> <?xml version='1.0' encoding="UTF-8" standalone="no" ?>
>> <ServiceExceptionReport version="1.3.0" xmlns="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/ogc http://schemas.opengis.net/wms/1.3.0/exceptions_1_3_0.xsd">
>> <ServiceException>
>> msDrawMap(): Image handling error. Failed to draw layer named 'test-layer'.
>> </ServiceException>
>> </ServiceExceptionReport>
>> GDAL: In GDALDestroy - unloading GDAL shared library.
>> Thanks
>> Best regards Gerhard
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