On 11-09-06 08:10 AM, Joaquim Luis wrote:
Hi,
I wrote a OGR C MEX wrapper to use in Matlab which already works in many cases.
However, I had a situation when trying to fetch the reference info. The chunk
of code below now works, but if I use the commented line that calls
OGR_G_ExportToWkt
than Matlab crashes at that line. However, using the OSRExportTo... functions
works fine.
I'm I doing something forbidden or ...
...
hSRS = OGR_L_GetSpatialRef(hLayer); /* Do not free it later */
if (hSRS) {
char *pszWKT = NULL, *pszProj4 = NULL;
mxArray *mxPrjRef;
/*OGR_G_ExportToWkt (hSRS, &pszWKT); */ <====== THIS CALL MAKE THE MEX CRASH
if (OSRExportToProj4(hSRS, &pszProj4) == OGRERR_NONE) {
Joaquim,
OGR_G_* functions are intended to operate on OGRGeometry objects while
OSR* functions operate on OGRSpatialReferences. Your hSRS object is an
OGRSpatialReference and not suitable to pass to OGR_G_ExportToWkt().
You should use OSRExportToWkt() to translate an OGRSpatialReference into it's
WKT representation.
Best regards,
--
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