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If TRUE, the physical hardware (e.g., scanner, digital camera, image database, etc.) that represents the image source is attached, powered on, and communicating.
This is a read only capability.
This capability can be issued at any time to determine the availability of the image source hardware.
The receipt of this capability request should trigger a test of the status of the physical link to the image source. The source should not assume that the link is still active since the last transaction, but should issue a transaction that actively tests this condition.
Type: TW_BOOL
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 Not Allowed MSG_SETCONSTRAINT Not Allowed MSG_RESET Not Allowed MSG_QUERYSUPPORT TW_ONEVALUE
All image Sources
Version 1.6
TWAIN Notice
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The TWAIN Toolkit is distributed as is. The developer and distributors of the TWAIN Toolkit expressly disclaim all implied, express or statutory warranties including, without limitation, the implied warranties of merchantability, noninfringement of third party rights and fitness for a particular purpose. Neither the developers nor the distributors will be liable for damages, whether direct, indirect, special, incidental, or consequential, as a result of the reproduction, modification, distribution or other use of the TWAIN Toolkit.
