GDAL/OGR in C++: Merge multiple vector datasets to single

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I need to merge multiple kml files into a single one.I found that I could use "ogr2ogr -append" but I have to do it through c++ and my Google-fu hasn't been successful so far.So, any ideas?

Also, I would appreciate any advice on adding new fields(and manually values in that field) in a kml file (through C++ again). Probably something to do with OGR_Fld_Create?

Thanks!



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