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July 11, 2007 at 2:50 pm #23872
the dat will be ExtImageInfo and the Msg will be Get.
I have a sample in vb.net if you’re interested (sorry no c++ samples yet) that runs thru an enum of all of the standard twei over at codeplex/opentwain the method name in the sample is GatherAllStandardExtImageInfo and it is in the file cTwain.vb