C# Application to scan multiple pages via document feeder (WIA)

Russ Suter
Russ Suter used Ask the Experts™
I'm trying to use WIA to scan multiple pages through the document feeder. I can access the scanner, connect to the scanner, and even actually scan but it doesn't quite work as expected. If I have more than one page in the document feeder the scanner scans all pages at once and then creates a single image that is only the first page. I'm following the examples from here: https://social.msdn.microsoft.com/Forums/vstudio/en-US/edaa6de7-e372-4b57-89a5-dd74c5f30983/adf-scanning-using-wia-only-one-image-saved?forum=csharpgeneral

There seems to be some reference to other people experiencing the same problem and a link to a supposed solution here: https://support.microsoft.com/en-us/help/261820

Unfortunately, that link is dead so I'm hoping someone here might have a clue. How do I get the scanner to actually scan multiple pages rather than feed them all but only scan the first one?
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You probably know about NAPS2? Use that first, see if it scans correctly. If it does, you already have the code, and re-inventing the wheel seems pointless. Source code here: https://github.com/cyanfish/naps2
Others have had that problem before, multiple pages with adf
scan multiple images from scanners with an auto document feeder
the bottom line is that instead of setting device properties and then setting item properties , you need to set item first
if you call WiaDev.Items[1] apprently it erases the item from memory so you cant call it again
so you must store it in a variable THEN the properties must be set.
check for more pages and loop until no more

check both codes its a little different approach from each one but the bottomline is the same
Russ SuterSenior Software Developer



I have been down that road already and addressed the issue. The current oddity is with an HP LaserJet Pro MFP M426f. When I connect via USB it seems to scan and print all pages from the ADF as well as a single page from the flatbed. However, when I connect to the same printer via Ethernet and use the exact same code the ADF feeds all pages but only scans the first one.

From the additional research I've been doing it appears that WIA may not be the solution here. I may need to look into using TWAIN instead.
Senior Software Developer
WIA just doesn't have good support for ADF scanning. TWAIN may be older but it's also more robust. For cameras, WIA is suggested but for document scanning TWAIN is definitely the way to go.

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