[gdal-dev] Ogr and Dwg via Teigha (in C#)

[Noon Silk]

Hi Tamas,

 Thanks.

 I'm partly towards getting a build going; but am I to understand that
generating the SWIG bindings is best done from linux? (That is, I note
that the code to generate the bindings is in a shell script; I'm
currently attempting to figure out how to run it, but I'm not sure if
there is a better way; I.e. I'm running "mkinterface.sh", which I
found from "mkdgdaldist.sh").

--
Noon


On Mon, Oct 29, 2012 at 4:49 AM, Tamas Szekeres <szekerest at gmail.com> wrote:
> Noon,
>
> The C# bindings provided by OGR provide a common interface for all drivers.
> You can use the Datasource class for each of the drivers . You can
> instatiate the driver by using the driver specific connection string (ie by
> using Ogr.Open) or obtain a specific driver (Ogr.GetDriverByName)  and open
> the datasource on that (Driver.Open).
>
> You may however need to compile the DWG driver with OGR if that is provided
> by default with the binary distribution you are using. According to your
> concerns, enabling or not enabling the driver should not affect compilation
> of the SWIG interface.
>
> Best regards,
>
> Tamas
>
>
>
> 2012/10/28 Noon Silk <noonslists+gdal at gmail.com>
>>
>> Hi All,
>>
>>  I'm trying to read DWG files and output OGR layers. I note, actually,
>> that there exists an OgrDwgDatasource in the C++; but I don't believe
>> it is built by default.
>>
>>  My difficutly comes in in that I'm using the SWIG-generated bindings.
>> I tried porting the C++ datasource code to C#, but stumbled upon a
>> problem - SWIG hadn't generated a usable OSGeo.OGR.DataSource. The
>> problem is, when you want to implement your subclass, you need to pass
>> some information to the constructor that you can't obtain (i.e. a new
>> instance of the DataSource). The reason why, I suppose, is that SWIG
>> hasn't even generated a newDatasource() method. So I find myself
>> wondering why, and being a bit confused.
>>
>>  I think basically I must be approaching this wrong. I'm supposing
>> what I should do is to compile OGR with DWG support (i.e. use the
>> OgrDwgDataSource.cpp that exists in ogr_frmts/dwg) and then have it
>> generate SWIG bindings from here. My concern with this is that,
>> glancing at the build scripts, it looks like it will work with
>> "DWGDirect", which I think is a precursor to Teigha. So I'm slightly
>> concerned that following this path will lead to build difficulties.
>>
>>  I suppose my question here is; what is the standard way to do this? I
>> would like to make use of the stuff already pre-written in Ogr to do
>> this, but I could be convinced that it's just better to approach it
>> from the Teigha side; converting to OGR myself. But of course I'd far
>> prefer just to simply change a small build parameter, get all the
>> correct SWIG bindings, and then just perform everything in C# ...
>>
>>  Appreciate any thoughts.
>>
>> --
>> Noon
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>



-- 
Noon Silk

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