I've been trying to get KML output working (6.5, OSgeo4W). After a lot of experimentation and all kinds of strange results, I managed to get something somewhat working, but still have some problems... The IRC channel seems dead, so here I am again. I've adapted the Itasca example map file to try to make it simpler... My example query strings are at the bottom. https://gist.github.com/anonymous/f0516f2766699e1ce3db
With the driver set to "OGR/KML" (this is undocumented?): WFS (queries 1 and 2) works. WMS (query 3) causes mapserv.exe to crash. With the driver set to "KML": WFS (queries 1 and 2) produces output with no points. There must be some projection problem. "Projection library error. All points failed to reproject". If I use the other EXTENT line, it crashes. WMS (query 3) now works. Or seems to... There may be a problem with my settings, but I don't think it should ever crash because of that. I've had lots of problems before I tried to use KML output, but they didn't include crashing. Because making various apparently unrelated changes results in it crashing, with no output to the log at all, perhaps there's a problem with some error message routine? This may be a problem with the OSgeo4W build, but they seem to have no user support at all... And should the output options affect the projection at all? Another problem... With WMS, the width and height parameters in the query have a big effect on the coordinates in the output (same as this? https://trac.osgeo.org/mapserver/ticket/3928). This doesn't make sense to me, as KML doesn't have "pixels", so the width and height of a hypothetical "image" should have no effect on coordinates, and maybe no effect on output at all. Also "non-square pixels" ( https://trac.osgeo.org/mapserver/ticket/3949) makes no sense for vector output. After discovering this problem with WMS, I switched to trying WFS, but then had the other problems.
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