Duplex issue with Clarity USB Scanner

[GisMe]

Has anyone had experience with the ‘WIA-Clarity USB Scanner’ driver? A customer says the CAP_DUPLEXENABLED fails, even though it’s returned as one of its capabilities.

I had them run a utility and found the MSG_GETCURRENT was returning TWRC_FAILURE with a conditon code of TWCC_BADCAP, which simply seems to mean that the driver does not support this feature. Yet it’s returned when checking CAP_SUPPORTEDCAPS.

They also tested with TWACK_32 and it reports that it can successfully change CAP_DUPLEXENABLED.

Every scanner I’ve tested that supports duplex works with our component, so I’m wondering if the driver is funky and TWACK_32 found a workaround. Any information is appreciated.

[Thierry]

Check from the source code of TWACK_32 if there is a workaround, but basically, why are you using WIA interface instead of TWAIN ?

[GisMe]

The end-user is using a WIA driver. There is nothing we can do about that. We don’t treat a WIA driver any differently than TWAIN, which may be part of the problem.

I’ll take a look at the TWACK code.

[Author]

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