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If TRUE, Source must acquire data from the document feeder acquire area and other feeder capabilities can be used. If FALSE, Source must acquire data from the non-feeder acquire area and no other feeder capabilities can be used.
The application should MSG_SET this capability to TRUE before attempting to use any other feeder capabilities. This sets the current acquire area to the feeder area (it may not be a different physical area on some Sources).
The application can MSG_SET this capability to FALSE to use the Source’s non-feeder acquisition area and disallow the further use of feeder capabilities.
This setting should reflect the current acquire area:
If TRUE, feeder acquire area should be used If FALSE, use non-feeder acquire area
Usually, the feeder acquire area and non-feeder acquire area of the Source will be the same. For example, a flatbed scanner may feed a page onto the flatbed platen then scanning always takes place from the platen.
The counter example is a flatbed scanner that moves the scan bar over the platen when CAP_FEEDERENABLED is FALSE, but moves the paper over the scan bar when it is TRUE. Default Support Guidelines for Sources Flatbed scanner (without an optional ADF installed) - Default to FALSE. Do not allow setting to TRUE (return TWRC_FAILURE / TWCC_BADVALUE) but support the capability (never return TWRC_FAILURE / TWCC_CAPUNSUPPORTED).
A device that uses the same acquire area for feeder and non-feeder, and has a feeder installed - Default to TRUE and allow settings to TRUE or FALSE (meaning allow or don’t allow other feeder capabilities).
A device that operates differently when acquiring from the feeder and non-feeder areas (for example, physical pages sizes are different) - Default to preferred area and allow setting to either TRUE or FALSE.
A sheet feed scanner or image database - Default to TRUE (meaning there is only one acquire area - the feeder area) and do not allow setting to FALSE (return TWRC_FAILURE / TWCC_BADVALUE).
A handheld scanner would not support this capability (return TWRC_FAILURE / TWCC_CAPUNSUPPORTED). Type: TW_BOOL
Value after MSG_OPENDS: (may be remembered from a previous session)
After MSG_RESET/MSG_RESETALL: (selected by the data source writer)
Allowed Values: TRUE or FALSE
MSG_GET TW_ONEVALUE TW_ENUMERATION // 2.0 and higher
MSG_GETCURRENT TW_ONEVALUE
MSG_GETDEFAULT TW_ONEVALUE
MSG_SET TW_ONEVALUE
MSG_SETCONSTRAINT TW_ONEVALUE TW_ENUMERATION // 2.0 and higher
MSG_RESET TW_ONEVALUE
MSG_QUERYSUPPORT TW_ONEVALUE
All Sources with feeder devices
Version 1.0
CAP_AUTOFEED CAP_CLEARPAGE CAP_FEEDERLOADED CAP_FEEDERPOCKET CAP_FEEDERPREP CAP_FEEDPAGE CAP_REWINDPAGE
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