Nyall, Thank you so much for your help. That was exactly what I needed and I don't think I would have figured that one out.
Calvin Actually the best approach is to use a layer post processor. This is > flexible and totally thread-safe :) > > I don't think there's any Python examples in QGIS yet, but see > > https://github.com/qgis/QGIS/blob/master/src/analysis/processing/ > qgsalgorithmcategorizeusingstyle.cpp#L104 > > and > > https://github.com/qgis/QGIS/blob/master/src/analysis/processing/ > qgsalgorithmimportphotos.cpp#L227 > > for some c++ examples. > > Here's a possible Python example: > > https://gist.github.com/nyalldawson/26c091dd48b4f8bf56f172efe22cf75f > > Nyall >
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