With some formats sizeof, fseek and ftell can be most useful 

> On Jul 7, 2023, at 5:33 AM, Abel Pau <a....@creaf.uab.cat> wrote:
> 
> Hi,
> I would like to know if when we use the code of GDAL to program a driver (or 
> whatever) in vectors (so, ogr) we can assume that we can know the number of 
> elements we are going to import in any way or it would be possible not 
> knowing that until NextFeature is empty (or something like that). So, there 
> is any way to obtain this number of elements without doing a while? And in 
> case of multielements its possible to know how many parts are there in total?
> I need that to write my format (I don’t explain the details cause I don’t get 
> you bored :) )
>  
> If anyone know that I’d appreciate an answer. Thanks in advance.
>  
> Abel.
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