[Mapserver-users] crash using srs parameter in getmap request
John Pulles
john.pulles at geodan.nl
Fri Jun 11 05:46:06 EDT 2004
Ed McNierney wrote:
>Folks -
>
>What version of MapServer are you running when you get this crash? My
>memory is being fuzzy right now, but there was a bug quite a while ago
>that had something to do with a buffer/pointer problem with SRS
>parameters (I think). I ran into it and Daniel fixed it - but it was
>rather a long time ago. If you're using an old version of MapServer,
>try something newer.
>
>
>
Hi again,
The crash 'succeeded' with MapServer version 4.2-beta2 on W2K (from
http://160.94.77.165/ms42b2_gif_pg.zip). As far as I know, mapserver
version 4.2 is only available as a beta, so after suggestions to upgrade
to version 4.2, it seemed worth to try to build mapserver 4.2 on Linux.
With this version the crash does NOT occur and the url returns an image
with or without srs parameters for both desired projections.
Question that remains is if the problem in beta2 occurred because of
the beta status or because of the windows version?
John.
> - Ed
>
>Ed McNierney
>President and Chief Mapmaker
>TopoZone.com
>-----Original Message-----
>From: mapserver-users-admin at lists.gis.umn.edu
>[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of
>craig.gould at bt.com
>Sent: Thursday, June 10, 2004 9:17 AM
>To: Tom.Kralidis at ec.gc.ca; john.pulles at geodan.nl;
>mapserver-users at lists.gis.umn.edu
>Subject: RE: [Mapserver-users] crash using srs parameter in getmap
>request
>
>Tom,
>
>If John's crash is anything like the crash I experienced then it is the
>actual mapserv process on the machine that crashes with a null pointer
>exception somewhere.
>
>This crash only happens with certain types of projections. I was using
>British National Grid (BNG). The native projection of the WMS server was
>BNG, and the native projection of the WMS client was BNG. However if I
>include the SRS parameter then the map server process on the WMS server
>crashed (however not if you used a browser and did a standard request).
>If I took out the SRS parameter via a redirecting page the process did
>not crash.
>
>Upper and lower case made no difference for me. The application still
>crashed.
>
>BTW, when I found this problem I posted it on this list, but got no
>answer back. Since then at least two other people have posted similar
>problems. Each time I've let them know how I got round the problem.
>Unfortunately I can't get seem to get map server to compile on my win
>machine so I can't look into where this may be happening.
>
>Craig.
>
>
>
>
>-----Original Message-----
>From: Kralidis,Tom [Burlington] [mailto:Tom.Kralidis at ec.gc.ca]
>Sent: 10 June 2004 14:04
>To: Gould,CR,Craig,XGH6A C; john.pulles at geodan.nl;
>mapserver-users at lists.gis.umn.edu
>Subject: RE: [Mapserver-users] crash using srs parameter in getmap
>request
>
>
>
>Comments:
>
>- What do you mean by MapServer crashing? Are you getting a 500 error?
>Are you getting an OGC Service Exception Report XML document?
>- What is the *native* projection of the data? This is what should be
>declared in the PROJECTION block foreach layer
>- try your "wms_srs" declaration with lowercase (i.e. "init=epsg:28992")
>- trying a WMS GetMap request without the SRS keyword is an invalid
>request, and should throw an exception
>- WMS is not the problem. A WMS shall support all SRS projections it
>advertises in Capabilities
>
>..Tom
>
>=========================
>Tom Kralidis
>Systems Scientist
>Environment Canada
>Tel: +01-905-336-4409
>http://www.ec.gc.ca/
>
>
>
>
>
>>-----Original Message-----
>>From: mapserver-users-admin at lists.gis.umn.edu
>>[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of
>>craig.gould at bt.com
>>Sent: Thursday, June 10, 2004 7:33 AM
>>To: john.pulles at geodan.nl; mapserver-users at lists.gis.umn.edu
>>Subject: RE: [Mapserver-users] crash using srs parameter in
>>getmap request
>>
>>
>>John,
>>I and a few others have found the same problem.
>>The way round it is to create a web page that is called
>>instead of the opengis mapserver. This page forwards the
>>request to the mapserver but strips out the SRS paramater. If
>>the map server is using the projection you want returned by
>>default, then everything ends up OK. BTW this only happens
>>with certain projection types. Regards, Craig.
>>
>>
>>-----Original Message-----
>>From: mapserver-users-admin at lists.gis.umn.edu
>>[mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of
>>John Pulles
>>Sent: 10 June 2004 10:28
>>To: mapserver-users at lists.gis.umn.edu
>>Subject: [Mapserver-users] crash using srs parameter in getmap request
>>
>>
>>Hi List
>>
>>Using a map file with projection settings as shown below, I
>>get a crash of mapserver when doing an opengis getmap request
>>with &srs=epsg:28992. With an absent srs parameter or with
>>&srs=epsg:4326 a correct map is returned. Does anyone have an
>>idea what could be wrong?
>>
>>BTW: I am using MapServer version 4.2-beta2 on W2K, with the
>>PROJ_LIB environment variable set to the directory containing
>>the epsg file.
>>
>>
>>Regards,
>>John Pulles.
>>
>>MAP
>> NAME "Demo"
>>
>> PROJECTION
>> # RD
>> "init=EPSG:28992"
>> END
>>
>> EXTENT 10000 305000 280000 619000
>>
>> SHAPEPATH "c:\kaarten"
>> UNITS meters
>>
>> WEB
>> METADATA
>> "wms_title" "Demo"
>> "wms_srs" "EPSG:4326 EPSG:28992"
>> END
>> END
>>
>> LAYER
>> NAME provincies
>> DATA "provincies"
>> STATUS ON
>> METADATA
>> "wms_title" "Provincies"
>> "wms_srs" "EPSG:4326 EPSG:28992"
>> END
>> TYPE POLYGON
>> CLASS
>> COLOR 212 212 212
>> OUTLINECOLOR 0 0 0
>> END
>> PROJECTION
>> # RD
>> "init=EPSG:28992"
>> END
>> END
>>END
>>
>>--------------------
>>
>>
>>
>>
>>_______________________________________________
>>Mapserver-users mailing list Mapserver-users at lists.gis.umn.edu
>>http://lists.gis.umn.edu/mailman/listinfo/maps> erver-users
>>
>>
>>_______________________________________________
>>
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>>Mapserver-users at lists.gis.umn.edu
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>>
>>
>>
>
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