update interface to latest dwg/dxf lib

Have attached a patch to update DWG support to use DWG Direct library 2.04.01

ogr_dwg.h

In order to support latest 2.05.01 DWG/DXF library (DDWG) from ODA. And I hope it will support all future DDWG versions.

Changes done in ogr_dwg.h header (attached): - switch from OdChar? * to OdString? & - change OdInt?32 to OdInt?64 - make MyServices? available (drop //ifdef notdef) and put this name in OdStaticRxObject?<MyServices?> svcs;

DDWG has its own file buffer classes OdFileBuf?.h, OdFileBuf?.cpp in ddwg25\Extensions\ExServices? so my guess there is no reason to keep it in gdal trunk gdal-1.4.4\ogr\ogrsf_frmts\dxfdwg. Just move those files out of gdal scope and add the same from DDWG.

Building with msvc 8.0 extra DDWG lib linked list:

DD_vc8MD_PdfToolkit.lib DD_vc8MD_PdfExport.lib DD_VC8MD_RxRasterServices.lib Gs_WinOpenGL.lib Gs_WinGDI.lib DD_VC8MD_Br.lib DD_VC8MD_BrepRenderer.lib DD_VC8MD_AcisBuilder.lib DD_VC8MD_ModelerGeometry.lib DD_VC8MD_DbCommands.lib DD_VC8MD_Alloc.lib DD_VC8MD_SvgExport.lib DD_VC8MD_Gi.lib DD_VC8MD_Jpeg.lib DD_VC8MD_Db.lib DD_VC8MD_DbRoot.lib DD_VC8MD_Ge.lib DD_VC8MD_Gs.lib DD_VC8MD_Root.lib opengl32.lib DD_VC8MD_ZLib.lib DD_VC8MD_zip.lib DD_VC8MD_SpatialIndex.lib DD_VC8MD_BmpExport.lib DD_VC8MD_RxPlotStyleServices.lib DD_VC8MD_DynBlocks.lib DD_VC8MD_Ave.lib DD_VC8MD_RxRasterProcessor.lib DD_vc8MD_Dwf7Import.lib DD_vc8MD_Dwf7Export.lib WhipTk?.lib W3Dtk.lib DwfToolkit?.lib DD_VC8MD_ExFieldEvaluator.lib DD_vc8MD_PlotSettingsValidator.lib DwfCore?.lib

Gok,

If you could test an implementation without the local OdFileBuf?.cpp/h that would be very helpful. These were the only reason I had to move the dxfdwg driver out of mainstream GDAL.

I have committed the changes in gdal_diff (r13546). Are there distinct changes in the ogr_dwg.zip attachment? Can you guys (gok / tcollett) confirm here that you understand these changes are being contributed under the MIT/X license and that you have the right/permission to provide them?

No problem with the MIT/X license. The changes were based on the DWG examples (as was the original plugin) so there should be no problems there.

driver implementation suggestions

If you could test an implementation without the local OdFileBuf?.cpp/h that would be very helpful...

With those changes I did build gdal from trunk using nmake /NOLOGO /f makefile.vc default and using vc8 project as well. Attached is modified nmake.opt to support DWG/DXF.

I'm not familiar with GDAL structure so somebody should implement driver, datasource. Some suggestions are in attached ogrdwgdriver/datasource code (dxfdwg.zip)

Possibly related to ticket #227 ?