[mapserver-dev] Multiline string error
Ian Walberg
ian.walberg at airborne.aero
Thu Aug 14 14:38:58 PDT 2014
Thomas,
Yes of course.
Regards
Ian
-----Original Message-----
From: thomas bonfort [mailto:thomas.bonfort at gmail.com]
Sent: Thursday, August 14, 2014 2:26 PM
To: Ian Walberg
Cc: Lime, Steve D (MNIT); mapserver-users at lists.osgeo.org; mapserver-dev at lists.osgeo.org
Subject: Re: [mapserver-dev] Multiline string error
Ian,
Could you open a github issue for this one, and include a minimal mapfile that would allow me to reproduce the issue locally.
thanks,
thomas
On 14 August 2014 18:09, Ian Walberg <ian.walberg at airborne.aero> wrote:
> Steve,
>
> I used points for the feature data rather than the WKT string but seem to have got the same condition.
>
> I have added the debug line to the source to use the msPrintShape in the mapprimative.c file in the msPolylineComputeLineSegments function.
>
> Using EXTENT -111.9 37 -110 40
>
> FEATURE
> POINTS
> -110.220980 38.982832
> -110.220887 38.982863
> -110.221614 38.982708
> -110.220980 38.982832
> END
> TEXT "Testing"
> END
>
> With first and last point the same I get no shape details and nothing drawn on the map and no malloc error.
>
> FEATURE
> POINTS
> -110.220982 38.982832
> -110.220887 38.982863
> -110.221614 38.982708
> -110.220980 38.982832
> END
> TEXT "Testing"
> END
>
> With different first and last points I get the line drawn and the
> following debug :-
>
> [Thu Aug 14 08:47:10 2014].339760 Shape contains 1 parts.
> [Thu Aug 14 08:47:10 2014].339777 Part 0 contains 2 points.
> [Thu Aug 14 08:47:10 2014].339790 0: (825.885602, 260.055952)
> [Thu Aug 14 08:47:10 2014].339829 1: (825.886113, 260.055952)
>
> Then msSmallMalloc(): Out of memory allocating -8 bytes.
>
> We are happy to look further but any guidance to where to look would be great.
>
> With mapsever 6.4.1 the line does not get drawn when the points are the same but does not give a malloc error.
>
> Thanks
>
> Ian
>
>
> -----Original Message-----
> From: Lime, Steve D (MNIT) [mailto:Steve.Lime at state.mn.us]
> Sent: Thursday, August 14, 2014 7:40 AM
> To: Ian Walberg; mapserver-users at lists.osgeo.org;
> mapserver-dev at lists.osgeo.org
> Subject: RE: Multiline string error
>
> One quick thing to do would be to take OGR out of the mix. Just set up a mapfile with the feature in question as a WKT inline feature. Something like:
>
> LAYER
> NAME 'badwkt'
> TYPE LINE
> STATUS DEFAULT
> FEATURE
> WKT ' MULTILINESTRING ((-110.220980 38.982832, -110.220887 38.982863, -110.221614 38.982708, -110.220980 38.982832),(-110.220980 38.982832, -110.220887 38.982863, -110.221614 38.982708, -110.220980 38.982832))'
> END
> CLASS
> STYLE COLOR 0 0 0 END
> END
> END
>
> Then try to draw... If this fails then it's a MapServer issue.
>
> Steve
>
> -----Original Message-----
> From: Ian Walberg [mailto:ian.walberg at airborne.aero]
> Sent: Wednesday, August 13, 2014 9:38 PM
> To: Lime, Steve D (MNIT); mapserver-users at lists.osgeo.org;
> mapserver-dev at lists.osgeo.org
> Subject: RE: Multiline string error
>
> Steve,
>
> Version 6.4.1 built on the same machine with the same settings does not have the issue.
>
> Regards
>
> Ian
>
> -----Original Message-----
> From: Ian Walberg
> Sent: Wednesday, August 13, 2014 3:43 PM
> To: 'Lime, Steve D (MNIT)'; 'mapserver-users at lists.osgeo.org'; 'mapserver-dev at lists.osgeo.org'
> Subject: RE: Multiline string error
>
> Steve,
>
> We will add some debug to the OGR read later today or tomorrow.
>
> How do I turn on the maximum debug?
>
> Thanks
>
> Ian
>
> -----Original Message-----
> From: Ian Walberg
> Sent: Wednesday, August 13, 2014 3:20 PM
> To: 'Lime, Steve D (MNIT)'; mapserver-users at lists.osgeo.org;
> mapserver-dev at lists.osgeo.org
> Subject: RE: Multiline string error
>
> Steve,
>
> OGR connection to SQLITE DB.
>
> Regards
>
> Ian
>
> -----Original Message-----
> From: Lime, Steve D (MNIT) [mailto:Steve.Lime at state.mn.us]
> Sent: Wednesday, August 13, 2014 8:46 AM
> To: Ian Walberg; mapserver-users at lists.osgeo.org;
> mapserver-dev at lists.osgeo.org
> Subject: RE: Multiline string error
>
> How are you submitting the WKT to MapServer? Is it via MapScript, via inline features or some other mechanism?
>
> Steve
>
> -----Original Message-----
> From: mapserver-dev-bounces at lists.osgeo.org
> [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of Ian
> Walberg
> Sent: Wednesday, August 13, 2014 10:01 AM
> To: mapserver-users at lists.osgeo.org; mapserver-dev at lists.osgeo.org
> Subject: Re: [mapserver-dev] Multiline string error
>
> Devs,
>
> The MULTILINE string below gives the following in mapprimitive.c and then as the first shape has 0 points the msSmallMalloc fails as the size passed to it is -8.
>
> [Wed Aug 13 07:55:10 2014].618971 Shape contains 2 parts.
> [Wed Aug 13 07:55:10 2014].618987 Part 0 contains 0 points.
> [Wed Aug 13 07:55:10 2014].619001 Part 1 contains 3 points.
> [Wed Aug 13 07:55:10 2014].619016 0: (882.383078, 511.333078)
> [Wed Aug 13 07:55:10 2014].619032 1: (825.909890, 260.048026)
> [Wed Aug 13 07:55:10 2014].619049 2: (882.383078, 511.333078)
>
> Any clues what we should look at next?
>
> This same source data file and layer work with older versions of mapserver 6.
>
> Thanks
>
> Ian
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Ian
> Walberg
> Sent: Monday, August 11, 2014 3:53 PM
> To: mapserver-users at lists.osgeo.org; mapserver-dev at lists.osgeo.org
> Subject: [mapserver-users] Multiline string error
>
> Folks,
>
> With Mapserver 6.5-dev from git and GDAL 1.9.1 the line below either does not draw or causes mapserv to error and not render an image without an error message.
>
> MULTILINESTRING ((-110.220980 38.982832, -110.220887 38.982863,
> -110.221614 38.982708, -110.220980 38.982832),(-110.220980 38.982832,
> -110.220887 38.982863, -110.221614 38.982708, -110.220980 38.982832))
>
> Changing the final digit on either of the first or last lats/longs and it draws ok!
>
> Any ideas?
>
> Thanks
>
> Ian
>
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