You can't use OGR output formats that way. Calling msPrepareImage() on them
triggers a NULL pointer dereference (fixed in
https://github.com/mapserver/mapserver/pull/5069).
So using
$image = $map->draw()
$image_url = $image->saveWebImage()
is definitely the wrong way. The MapServer code hints to use msGMLWriteQuery()
for that which seems to be exported as
$map->savequeryasgml(string filename, string namespace)
Documentation is rare on that...
> Am I the only one having problems outputting OGR files ? Does anybody know
> what I could be doing wrong ?
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