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Using TWAIN to capture images from a scanner, I'm trying to determine if the open scanner has duplex scanning enabled. I know that if I use the DG_CONTROL/DAT_CAPABILITY/MSG_GETCURRENT triplet to fetch the CAP_DUPLEX capability, then it will tell me whether or not the scanner supports duplex scanning, but I need to know whether or not duplex is currently enabled. Is there a capability that I can get that will tell me whether or not duplex is enabled, not just supported?

Kevin Herrick
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  • Which scanner? I have some bad news for you, they are rarely truly TWAIN compliant, and most scanners have custom tags. – Trey Mar 24 '17 at 13:03

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Ther is another TWAIN capability - CAP_DUPLEXENABLED which serves for that.

SDmitry
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