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Canon 9080C … once again …

Forums › TWAIN Classic › Canon 9080C … once again …

  • This topic has 1 reply, 1 voice, and was last updated 11 years ago by Thierry.
Viewing 2 posts - 1 through 2 (of 2 total)
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  • January 7, 2010 at 4:27 pm #22565 Reply
    Thierry
    Participant
    • Topics - 6
    • Replies - 54
    • Total Posts - 60

    Hi,

    There is a special behavior with the TWAIN driver (GUI opened and visible, latest version).
    When I try to scan with the GUI opened, it seems to work, but as soon as I have a jam in the feeder, here’s what happens:
    – the scanner stops feeding (that’s ok)
    – the software receive a ‘no more images’ in the transfer (buffered/memory) loop
    – if I unjam the scanner, as soon as the scanner reset its feeder I receive something like a MSG_CLOSEDSREQ or MSG_CLOSEDSOK message.

    The problem I have with these messages is that my software handles them similarly, like ‘end of scan session’.

    So I never know when a jam occurs with this scanner (Kodak, Fujitsu, Panasonic and Inotec have a very different behavior when a jam occurs, and I have no problem with them, their GUI intercepts and handles everything).

    Is there a way to know when a jam occurs, when could I receive a TWCC_PAPERJAM ?

    When can I call DAT_DEVICEEVENT/MSG_GET to be sure to know that a jam occurs before I receive the MSG_CLOSEDSREQ ?
    Should I modify the message loop to accept a new MSG_XXX so I can call DAT_DEVICEEVENT/MSG_GET ?
    How to use these events efficiently ?

    Thanks,

    Thierry

    January 12, 2010 at 3:09 pm #25098 Reply
    Thierry
    Participant
    • Topics - 6
    • Replies - 54
    • Total Posts - 60

    Here’s what I saw concerning the DEVICEEVENT :

    No one implements this nice feature except Kodak, and the drivers (i200, i600) just send back an empty list of event … doesn’t help but why not …

    Fujitsu, Panasonic and Canon simply return nothing (FAILURE/UNSUPPORTED).

    So there is no way today to be aware of what happened during the scanning session.

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Reply To: Canon 9080C … once again …
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