[gdal-dev] [driver geoconcept] how to manage polyline with thousand of coordinates

[Richard Didier]

Le jeudi 2 décembre 2010 14:35:25, nicolas david a écrit :
> hi list
> 
> I've encountered some issue with a *.gxt file and ogr2ogr.
> This file contains only one geometry with more than 5000 intermediate
> coordinates. It's goemtry type is polyline (format 2). The size of this
> polyline is too big for the char buffer of the geoconcept driver. So I've
> got a "Too many characters at line .. " error message.
> 
> I've tried ( naively) to increase the size of this char buffer in the
> geoconcept.h file.
> *************************************************************************
> struct _GCExportFileH {
>   char                  cache[kCacheSize_GCIO+1];
>   char*                 path;
>   ....
> }
> 
> with first :
> #define  kCacheSize_GCIO          65535
> and then :
> #define  kCacheSize_GCIO          262143
> ***************************************************************************
> *
> 
> It compile and at the execution time the geoemtry line is readed but it
> leads to strange error on "OGRGeoconceptDataSource::LoadFile" method.
> More precisely on ligne 184 the
> "Open_GCIO(_pszName,_pszExt,pszMode,_pszGCT)"  method works and all
>  internal values seems ok after the return assigment the hGXT member are no
>  longer correct ( memory seems corrupt).
> 
> I've solve this issue by splitting my polyline object on multiple polylines
> objects. But I'll be very  grateful if someone could explain to me what's
> wrong with increasing the char buffer size !
> 

Could you file a ticket in the bug tracker, for me to follow this issue ?

> Nicolas David
> 
Sincerely,

didier
-- 
RICHARD Didier - Chef du pôle technique du Géoportail
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