Le mercredi 30 mars 2016 17:17:11, jramm a écrit : > Hi > I am implementing a write driver for the Vertical Mapper/Northwood Grid > format (NWT_GRD), which already has read support. > I have attached a diff of what I have got so far. Needless to say, it is > not complete or working :D. > > I'm looking for information on development, specifically: > > - Precisely what functions need to be implemented so the writing is fully > supported? (i.e. the minimum to be able to create a dataset from scratch > and write data to it using RasterIO).
What you implemented in your patch looks good : IWriteBlock, SetGeoTransform, SetProjectionRef, Create. With that, you can have full "dynamic creation" (as named in http://gdal.org/gdal_drivertut.html#gdal_drivertut_creation ), thus allowing it to be used as the target of gdalwarp for example. > - Is there any info out there on debugging GDAL drivers? What is the > standard approach. Currently im trying to use 'gdal_translate' as a way in > to get it to do something so I can set some break points...perhaps writing > a little test program would be a better method. Using gdal_translate is a reasonable way to test & debug write support. When used without any particular arguments, it's mostly a wrapper of CreateCopy(). > Which brings me to > - What standards are there for writing unit tests, test programs? I can see > a load of python under 'autotest' which im not familiar with. Are there any > guidelines on thise (the README is none too helpful). Not really. Generally looking at existing tests should give you a good idea of how to extend. The basic is to add a method that returns 'success' or 'fail' strings, and to add it to the gdaltest_list array. The gdaltest class has GDALTest() and testCreateCopy() methods that make it generally easy to test write support. Have a look at autotest/gdrivers/bt.py for example. I guess you found the existing tests for NWG_GRD are in autotest/gdrivers/nwt_grd.py > > Ive been over the driver implementation tutorial a number of times but info > on implementing write support is fairly scant. I'd happily add to this if I > can get this done.. > > Thanks for any help > grddataset_diff.txt > <http://osgeo-org.1560.x6.nabble.com/file/n5258855/grddataset_diff.txt> > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/Implementing-write-support-for-GDAL-dr > iver-tp5258855.html Sent from the GDAL - Dev mailing list archive at > Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
