Thanks Even, This seems to be working. But unfortunately we have projection code in several places, like https://mapwingis.codeplex.com/SourceControl/latest#MapWinGIS/trunk/Processing/Projections.cppand https://mapwingis.codeplex.com/SourceControl/latest#MapWinGIS/trunk/Grid/tkGridRaster.cpp(around like 440).
I tried to use your suggestion in all those places, but it does compile but doesn't run. I'll need to let a true C++ developer look at it ;) Thanks, Paul *Paul Meems * Release manager, configuration manager and forum moderator of MapWindow GIS. www.mapwindow.org Owner of MapWindow.nl - Support for Dutch speaking users. www.mapwindow.nl 2014-01-26 Even Rouault <even.roua...@mines-paris.org> > Le samedi 25 janvier 2014 23:50:10, Paul Meems a écrit : > > Hi all, > > > > Thanks to Tamas Szekeres we are now using his binaries from > > http://www.gisinternals.com/sdk/ with MapWinGIS, our mapping ActiveX. > > This has drastically simplified our build process and we are very > grateful > > for Tamas' help. > > > > We're now struggling with some minor issues regarding our 'old' C++ code > > and the new binaries for GDAL, GEOS, Proj4, etc. > > Several of them I managed to solve, but I'm struggling with this one. > > We have code to read a prj file and get the Proj4 string: > > > > void ProjectionTools::GetProj4FromPRJFile(char * prjfileName, char ** > > prj4) > > { > > FILE * pFile; > > pFile = fopen (prjfileName,"r"); > > if (pFile == NULL) > > { > > // Doesn't exist > > return; > > } > > fclose(pFile); > > pFile = NULL; > > OGRSpatialReference* oSRS = new OGRSpatialReference(); > > > > char **papszPrj = CSLLoad(prjfileName); > > if (papszPrj == NULL) > > { > > return; > > } > > > > OGRErr eErr = oSRS->importFromESRI(papszPrj); > > if (eErr != OGRERR_NONE) > > { > > OGRErr eErr = oSRS->importFromProj4(*papszPrj); > > } > > > > CSLDestroy( papszPrj ); > > char * pszProj4 = NULL; > > eErr = oSRS->exportToProj4( &pszProj4 ); > > delete oSRS; <-- going wrong now > > > > *prj4 = new char[_tcslen(pszProj4)+1]; > > strcpy(*prj4, pszProj4); > > CPLFree(pszProj4); > > } > > > > This code was working for years, but now it crashes on delete oSRS;. > > I've been searching for examples of how to use exportToProj4() in C++ but > > can only find Python examples. > > And I'm not a C++ developer, just a C# developer :) > > How should I now free oSRS? > > The code looks OK and there's no fundamental reason why it would not work > any > longer. I highly suspect that you are running into a classical issue of a > mismatch between the compile flags used in your application and the ones > used > by the GDAL built itself. > > You could perhaps avoid that by letting GDAL do the allocation and > deallocation with > > oSRS = (OGRSpatialReference*)OSRNewSpatialReference(NULL); > > and > > OGRSpatialReference::DestroySpatialReference(oSRS) > > > > > Thanks for any advice. > > > > Paul > > > > *Paul Meems * > > Release manager, configuration manager > > and forum moderator of MapWindow GIS. > > www.mapwindow.org > > > > Owner of MapWindow.nl - Support for > > Dutch speaking users. > > www.mapwindow.nl > > -- > Geospatial professional services > http://even.rouault.free.fr/services.html >
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
