Hello,
In the Python bindings, after calling `gdal.UseExceptions()` trying something
like an out-of-range raster read will raise an error like:
[ ... traceback ... ]
File
"/home/jbanorthwest.co.uk/danielevans/venvs/farmcat3/lib64/python3.6/site-packages/osgeo/gdal_array.py",
line 246, in _RaiseException
raise RuntimeError(gdal.GetLastErrorMsg())
RuntimeErrorRuntimeError: /data/gfm/maps/FLRF_Q100.vrt, band 1: Access window
out of range in RasterIO(). Requested
(1,123456789) of size 1x1 on raster of 1296001x507215.
It is possible to set a custom error handler to determine how log messages
should be recorded. For example, to silence all logging:
gdal.SetErrorHandler('CPLQuietErrorHandler')
Or to point to a custom Python error handling function:
gdal.SetErrorHandler(self.log)
This does not affect the act exceptions being raised. However, GDAL no longer
shows the last error message:
File
"/home/jbanorthwest.co.uk/danielevans/venvs/farmcat3/lib64/python3.6/site-packages/osgeo/gdal_array.py",
line 246, in _RaiseException
raise RuntimeError(gdal.GetLastErrorMsg())
RuntimeError
This implies that `gdal.GetLastErrorMsg()` is returning nothing, i.e. that the
last error has been cleared. However, this seems to be at odds with the C++
documentation for the CPLError() function, which states that:
Regardless of how application error handlers or the default error handler
choose to handle an error, the error number, and message will be stored for
recovery with
CPLGetLastErrorNo()<https://gdal.org/doxygen/cpl__error_8h.html#a4a583fe987b8f1a7b2468805578fa8d4>
and
CPLGetLastErrorMsg()<https://gdal.org/doxygen/cpl__error_8h.html#a7f71ade3bb0a0e9e45802975ec59ff5e>.
https://gdal.org/doxygen/cpl__error_8h.html#afda4d86428c1c533449ae6a69cdf430d
Is the error message being cleared incorrectly?
Dr Daniel Evans
Software Developer
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