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

[Angelos Tzotsos]

Hi,

Can you please list the versions of libgdal and python-gdal that are 
installed on your machine?

Best,
Angelos

On 10/14/2016 06:41 AM, alassane toure wrote:
> 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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-- 
Angelos Tzotsos, PhD
OSGeo Charter Member
http://users.ntua.gr/tzotsos

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