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

[Tamas Szekeres]

This doc is fairly old (written by me ;-) , but the build process hasn't
been changed for years. What did you mean by "it doesn't appear to be
included as part of any existing build/packaging process"?

Best regards,

Tamas



2012/10/29 Noon Silk <noonslists+gdal at gmail.com>

> Answering my own question, I've found that this is documented here:
>
>  - http://trac.osgeo.org/gdal/wiki/GdalOgrCsharpCompile
>
> I note that it doesn't appear to be included as part of any existing
> build/packaging process in the source when I grabbed it
> (release-1400).
>
> --
> Noon
>
>
> On Mon, Oct 29, 2012 at 11:13 AM, Noon Silk <noonslists+gdal at gmail.com>
> wrote:
> > 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
> >
> > Fancy a quantum lunch? https://sites.google.com/site/quantumlunch/
> >
> > "Every morning when I wake up, I experience an exquisite joy — the joy
> > of being this signature."
>
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