how to set a Range->CurrentValue

[kpr]

Hello again,

I am using the Twain2.0 CLI Sample App to understand how TWAIN works. The App is very good to learn. But it only uses TWON_ONEVALUE for ICAP_XRESOLUTION and ICAP_YRESOLUTION. When used with the Avision Scanner, it returns “Unsupported Capability”, because it only supports TWON_ONEVALUE and TWON_ENUMERATION.

I was able to manage to write a function to GET an ICAP_XRESOLUTION, the source returns a TWON_RANGE type. But at the moment I am stuck to SET the CurrentValue.

I am able to set it simply as TWON_ONEVALUE, but then the application chrashes during the scan.

If I leave the Resolution untouched, the app works.

The MFC-Sample app from TWAIN.org is able to set the resolution (with the vendor UI)…

Thanks in advance!

[kpr]

well, allthough the Avision support told me that the Dual Interface driver was the best one for the AVA6 Plus device, I was not able to find a solution to that problem.

I tried an older AVA6Plus driver, that solved the problem for me. I suppose that the Dual Interface driver is somehow special, because it is able to connect 2 devices somehow and use them as one..

just for the record:
Dual Interface driver: dualv56r20090828
AVA6 Plus standard driver: AVA6Plus_v542beta_20081202

older, but better…

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