[Mapserver-users] crash using srs parameter in getmap request

[craig.gould at bt.com]

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
> 
> --------------------
> 
> 
> 
> 
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