Hi,
My library mylib uses OGRSpatialReference as setting for a project. Thus
the variable OGRSpatialReference SpatialReference is defined outside the
scope. Then one can set spatial reference, set length units and this is going
to be a project setting (this is done via setters/getters API defined in mylib
). Then all data that will be loaded to the RAM will be transformed to this
spatial reference. My library is built as a shared library.
The application which uses my library is built on Qt and it is modular
application. Briefly I can describe it as:
* app executable that links to the applib
* applib is the main library that links to mylib and gdal
* appmodule is loadable module that links to mylib and gdal
* mylib links to the gdal
If I set SpatialReference setting from applib then there is no any problem,
I can set spatial reference from user input and set length units and then get
them them back (print it).
But if I try to do the same then SpatialReference is able to store only length
units while the authority name/code can’t be retrieved (it gives me empty).
Retrieving SpatialReference also doesn’t return spatial reference that were
previously set.
The PROJ_LIB variable is set when app is launching and it should be ok.
I really have no idea why this is happening and have to ask for help…
Ubuntu 20.04, prebuilt GDAL 3.1.4 with PROJ 7.0.1 (i don’t remember exactly the
version of PROJ). The link where I download GDAL is here
Here is the code that I use for settings in mylib_settings.cpp :
/*------------- START OF mylib_settings.cpp -------------*/
#include "mylib_settings.h"
#include <units/units.hpp>
#include <gdal/gdal.h>
#include <gdal/gdal_priv.h>
namespace {
static OGRSpatialReference SpatialReference {};
} // namespace
// Only these setters/getters are exported
void setSpatialReference ( OGRSpatialReference sr){
SpatialReference = sr;
}
void setSpatialReferenceFromUserInput (
const std::string & name){
SpatialReference .SetFromUserInput(name.c_str());
}
void setSpatialReferenceFromUserInput (
const std::string & authName, const std::string & code){
SpatialReference .SetFromUserInput((authName + ":" + code).c_str());
}
OGRSpatialReference getSpatialReference (){
return SpatialReference ;
}
void setLengthUnits ( const std::string & units){
double coef = units::convert(
units::unit_from_string(units),
units::unit_from_string("meter"));
SpatialReference .SetLinearUnitsAndUpdateParameters(units.c_str(), coef);
}
std::string getLengthUnits (){
const char *units = nullptr ;
SpatialReference .GetLinearUnits(&units);
return std::string (units);
}
std::string getAuthorityName (){
if ( auto * p = SpatialReference .GetAuthorityName({}))
return p;
return {};
}
std::string getAuthorityCode (){
if ( auto * p = SpatialReference .GetAuthorityCode({}))
return p;
return {};
}
/*------------- END OF mylib_settings.cpp -------------*/
Regards,
Kerim Khemraev
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