[gdal-dev] Fwd: NotImplementedError: Wrong number of arguments for overloaded function 'Feature_SetField'.

[Ole Nielsen]

Thanks - I was hoping I could rely on the library to do the intelligent
truncation, but couldn't work it out.
Can I just clarify that the name to use with SetField would then be what is
provided by your last line?

 layer_defn.GetFieldDefn(last_field_idx).GetNameRef()

Cheers and thanks
Ole

On Tue, Sep 6, 2011 at 9:26 PM, Even Rouault
<even.rouault at mines-paris.org>wrote:

> Selon Ole Nielsen <ole.moller.nielsen at gmail.com>:
>
> > Hi Even
> >
> > Thanks again for all your help - all tests now pass using either gdal 1.6
> or
> > 1.8. Just to summarise, there were three issues as I see them:
> >
> >
> >    1. Bounding boxes for raster data are computed differently (but
> better)
> >    in newer versions
>
> Specific to PixelIsPoint in the GTiff driver.
>
> >    2. While v1.6 of ogre would allow an single number of type
> numpy.ndarray
> >    this is no longer allow. Casting it to a float solves the problem.
>
> I wasn't aware it could work before. There's perhaps now an ambiguity on
> which
> method to use, due to the addition of new possibilities for SetField()
> (just a
> bling guess).
>
> >    3. New versions of ogre will not allow attribute names of length
> longer
> >    than 10 (at least when using the ESRI driver). Formerly, I think it
> > silently
> >    truncated, now it is up to the user. That's at least what I did.
>
> I've a looked quickly a bit at your code and I've the feeling that you
> truncate
> yourself, instead of relying on OGR. The Shapefile driver does more than
> truncating. It also ensures uniqueness of the truncated names. For example,
> if
> you try creating "a_very_long_name" and "a_very_long_name_again", they will
> be
> respectively truncated to "a_very_lon" and "a_very_l_1". A safer solution
> to get
> the field name that got to the file would be to :
>
> field_defn = ogr.FieldDefn("a_very_long_name", ogr.OFTString)
> lyr.CreateField(field_defn)
> layer_defn = lyr.GetLayerDefn()
> last_field_idx = layer_defn.GetFieldCount() - 1
> real_field_name = layer_defn.GetFieldDefn(last_field_idx).GetNameRef()
>
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