[gdal-dev] Re: Rasterlite / WSGI problem
radim.blazek at gmail.com
Wed Nov 30 07:34:45 EST 2011
On Wed, Nov 30, 2011 at 11:28 AM, Even Rouault
<even.rouault at mines-paris.org> wrote:
>> BTW, if RasterliteBand::IReadBlock fails, it does not return an error
>> and silently sets image to black (rasterlitedataset.cpp:98):
>> OGRLayerH hSQLLyr = OGR_DS_ExecuteSQL(poGDS->hDS, osSQL.c_str(),
>> NULL, NULL);
>> if (hSQLLyr == NULL)
>> memset(pImage, 0, nBlockXSize * nBlockYSize * nDataTypeSize);
>> return CE_None;
>> Is it OK?
> Perhaps CE_Failure would be more appropriate indeed. In the event of an empty
> result set, this should return a valid layer, so NULL is definitely when
> something is wrong. You can try returning CE_Failure and if it works as you
> expect, feel free to commit the change.
I have tried to set error message with CPLError and return CE_Failure,
but the error message set here is lost and mapserver gets something
like "error reading block 0 0 ..".
Sorry, I have lost already too much time on this, so I am not going to
work on it more.
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