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… Is there a way to check the scanner type? …
From the FAQ [http://twain.org/faq.htm]:
Question: Is it possible from a TWAIN application to know if a scanner is a flatbed scanner or not?
Answer: Yes, it is. If CAP_FEEDERENABLED is not supported or it is but it cannot be set to true then it is safe to assume the scanner is a flatbed-only device (at least, this is the functionality that can be accessed from its TWAIN Data Source). If CAP_FEEDERENABLED is supported and can be set to true then the scanner is equipped with a feeder. If CAP_AUTOFEED is supported and can be set to true then the feeder is an automatic document feeder (ADF). If CAP_FEEDERENABLED is supported but the only supported value is true then the device would be a feeder-only scanner (or a similar device supporting only feeder-like operations).