OGR input plugin's file check precludes OGDI driver use

[ryhalt]

When importing data such as VPF/VRF using OGR's OGDI driver, the Mapnik OGR plugin's file existence check isn't formulated to accept the OGDI driver's file string format (gltp:/<driver>/<file>).

Everything seemes to work except the file existence check. Commenting out the check at line 71 of ogr_datasource.cpp:

if (!boost::filesystem::exists(dataset_name_))...

seems to provide a preliminary fix.

[springmeyer]

Ryan,

Thanks for the report. I've got a patch ready removes this and fixes up a few other things that I'll try to find a moment to commit tomorrow.

- Dane

[springmeyer]

As noted in #337 and #126, we should be relying on GDAL/OGR error reporting to handle whether files/datasets exist. So, the attached patch starts that in motion by switching from the boost filesystem check to using 'CPLGetLastErrorMsg()' after a problem is encountered using 'OGROpen()'.

[springmeyer]

Try to register a dataset and report ogr error and report all possible layers when none supplied

[springmeyer]

see also patch for gdal at #337

[springmeyer]

reassigning to kunitoki, so he can take a look and apply...

[springmeyer]

we'll need to make sure to rollback most of this: http://trac.mapnik.org/changeset/1042/trunk/plugins/input/ogr

[kunitoki]

Closed with r1130 applying patch