[gdal-dev] NULL-returning functions and CPLGetLastErrorMsg

[Laurențiu Nicola]

Hello,

Many GDAL functions can return nullptr (e.g. OSRGetName, OSRGetAuthorityCode etc.), but it's not clear if they set an error message that can be retrieved using CPLGetLastErrorMsg. I tried to check the code, but CPLErrorSetState isn't called from many places, so I'm probably missing something like a PROJ/GEOS error handler that sets it.

Is there any rule-of-thumb for figuring out when CPLGetLastErrorMsg should be used?

Thanks,
Laurentiu
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