[Ubuntu] cpp and python codes not able to access gdal library

[alassane toure]

Even,

I tried the followings but the response did not change...

sudo apt-add-repository ppa:ubuntugis/ubuntugis-unstable
sudo apt-get update
sudo apt-get install python-gdal

Any suggestions?
Thanks,
Alassane

On Thu, Sep 8, 2016 at 3:51 AM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Alassane,
>
> > I developed a gdal code on my local machine and it worked.  Having gdal
> and
> > g++ working on the server my compilation of the same code resulted in the
> > following response...
> >
> >  gcc -o applymask applymask.cpp -I /usr/include/gdal -lgdal -lm
> > applymask.cpp: In function âint main(int, char**)â:
> > applymask.cpp:63:95: warning: ignoring return value of âCPLErr
> > GDALRasterBand::RasterIO(GDALRWFlag, int, int, int, int, void*, int,
> int,
> > GDALDataType, GSpacing, GSpacing, GDALRasterIOExtraArg*)â, declared with
> > attribute warn_unused_result [-Wunused-result]
> >          Band->RasterIO( GF_Read, 0, iLine,nXSize, 1, inScanline, nXSize,
> > 1, GDT_Float32,0, 0 );
> >
> >                    ^
> > applymask.cpp:64:101: warning: ignoring return value of âCPLErr
> > GDALRasterBand::RasterIO(GDALRWFlag, int, int, int, int, void*, int,
> int,
> > GDALDataType, GSpacing, GSpacing, GDALRasterIOExtraArg*)â, declared with
> > attribute warn_unused_result [-Wunused-result]
> >          maskBand->RasterIO( GF_Read, 0, iLine,nXSize, 1, maskScanline,
> > nXSize, 1, GDT_Float32,0, 0 );
> >
> >                          ^
> > applymask.cpp:75:94: warning: ignoring return value of âCPLErr
> > GDALRasterBand::RasterIO(GDALRWFlag, int, int, int, int, void*, int,
> int,
> > GDALDataType, GSpacing, GSpacing, GDALRasterIOExtraArg*)â, declared with
> > attribute warn_unused_result [-Wunused-result]
> >    outBand->RasterIO( GF_Write, 0, iLine,nXSize, 1, outScanline, nXSize,
> 1,
> > GDT_Float32,0, 0 );
> >
>
> The warning says it all. You use GDALRasterBand::RasterIO() but do not
> check
> the return value. You probably don't get it on your local machine since it
> might use an older version of GDAL where this method wasn't tagged with the
> warn_unused_result attribute.
>
> The right fix is to check the return value and do something appropriate.
> Or you
> can silence the warning by enclosing the calls in CPL_IGNORE_RET_VAL(...)
>
> >
> > Also, my python code does not import all refered libraries including
> gdal.
> >
> >   File "/usr/local/bin/CD4DEM.py", line 12, in <module>
> >     import gdalImportError: No module named gdal
>
> Did you install the python-gdal package ?
>
> Even
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>
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