I’m perplexed by duplex

[turnerg]

My application, which can handle duplex scanning via a Fujitsu fi4220c scanner, errors when I try duplex scanning on a Fujitsu fi5220c.

My code checks CAP_DUPLEX (it is TWDX_1PASSDUPLEX for both) so I set DUPLEXENABLED = true and XFERCOUNT = 2 when I scan each sheet via the feeder.

Having got the MSG_XFERREADY message I do the following:

iRtn = DSM_Entry(m_tAppID,m_tSrcID,DG_IMAGE,DAT_IMAGENATIVEXFER,MSG_GET,lhDIB)

If iRtn = TWRC_XFERDONE Then

' ... process dib handle ... and then check for pending xfers

iRtn = DSM_Entry(m_tAppID,m_tSrcID,DG_CONTROL,DAT_PENDINGXFERS,MSG_GET,tPending)

If tPending.Count <> 0 Then

' tPending.Count is '-1' - attempt to get second image

iRtn = DSM_Entry(m_tAppID,m_tSrcID,DG_IMAGE,DAT_IMAGENATIVEXFER,MSG_GET,lhDIB)

this causes the following error

The calling procedure is invalid. (Internally)(Code: DS50002)

Does anyone have any idea how I can get duplex scanning to work for the newer version scanner?

Thanks

[dpenney]

Can you do a duplex scan using the fi5220c DS in any program other than your own? If not, you probably found a bug in the DS. I would suggest trying to contact Fujitsu for a solution.

If you can do a duplex scan in some other program it MAY indicate that your program will work if you switch to a memory or file transfer. Very few programs use native transfers so perhaps Fujitsu is not aware that their fi5220c DS has a bug when using native transfers for duplex scans.

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