[Qgis-developer] Issue with Shapefile creation algorithm

[Jean-Christophe Bastin]

Hi QGIS Developers,

I didn't had other answer about my thread.
Nobody here can tell me if there is any tool that can analyse my 
shapefile to know exactly what's wrong with it ?

Many thanks.

Regards,

JCB

Le 21/03/2016 10:36, Jean-Christophe Bastin a écrit :
> I just found the "checking tool" of geometry in the Vector menu of QGIS.
> It tells me "Unknown geometry type 0", "The geometry has 1 error".
> But in my algorithm, I put 5 as type, as explained in specifications.
> From where comes this 0 ? ...
>
> Regards,
>
> JCB
>
> Le 21/03/2016 10:16, Jean-Christophe Bastin a écrit :
>> Thank you for the answer Maximilian
>>
>> Indeed, the Python console shows me None for some geometries.
>> Do you know any tool that can analyse what's wrong with the shape ?
>> Maybe something that can translate the shp file into a readable 
>> format according to specifications from 
>> https://www.esri.com/library/whitepapers/pdfs/shapefile.pdf ?
>>
>> Regards,
>>
>> JCB
>>
>> Le 18/03/2016 14:54, Maximilian Krambach a écrit :
>>> For the one shape I get 7 valid and one "none" geometries (the last
>>> feature).
>>> for the other shape, just a "none" geometry
>>>
>>> It seems that some "end of file" is off.
>>>
>>> Function I used with the python console in QGIS:
>>>
>>> layer = iface.activeLayer()
>>> for feature in layer.getFeatures():
>>>      print feature
>>>      print feature.geometry()
>>> print layer.featureCount()
>>>
>>>
>>> Am 18.03.2016 um 14:18 schrieb Jean-Christophe Bastin:
>>>> Hi QGIS Developers :-)
>>>>
>>>> I asked some help on QGIS support, but they told me that I don't 
>>>> ask my
>>>> question at the right place, and that I should go througth developers
>>>> email list.
>>>> That's why I'm here. So let me explain what's going on.
>>>>
>>>> I developped an application with a class able to read data from an
>>>> Oracle database with MapXtreme (MapInfo), and convert them in 
>>>> Shapefile.
>>>> This class follows the ESRI specifications from here :
>>>> https://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
>>>> You can find in attach 2 samples that I tried to open in QGIS :
>>>> - 4480___S12_060_4 : there is only one polygon, but it is not 
>>>> displayed
>>>> on the map
>>>> - 4480___327550 : there are 8 polygons in this one, and all of them 
>>>> are
>>>> well displayed
>>>> The strange thing is that the polygon from "4480___S12_060_4" is 
>>>> common
>>>> with "4480___327550", but in one case it is not shown, and in the 
>>>> other
>>>> case it is shown.
>>>> I have no problem when I open these files with MapInfo.
>>>> I don't have ArcMap to check on this side.
>>>> The support told me they were not able to open my files with SAGA, 
>>>> but I
>>>> downloaded SAGA GIS 2.2.3 and was able to open the file without any 
>>>> issue...
>>>>
>>>> According to QGIS support, it looks like an issue in my creation
>>>> algorithm, but I really don't see what's wrong, it seems to follow 
>>>> well
>>>> the ESRI specifications.
>>>> I'm not a "GIS expert", so maybe some of you could help me to discover
>>>> what's wrong.
>>>> Or if you have any GIS tool that can tell me what's not correct in my
>>>> shapefile, it could really help me.
>>>>
>>>> You can find in attachment the source code of my class in VB.Net.
>>>>
>>>> Many thanks !
>>>>
>>>> Regards,
>>>>
>>>> JCB
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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