GdPicture Imaging Forums

Hello,

When I call the method TwainSelectSource, all of the scanner driver's appear, including WIA drivers. If my user chooses a WIA driver, I want to be able to scan using the WIA methods. I am able to identify that the user chose a WIA driver because it usually has WIA in the source name or in the source family.

In order to scan using WIA methods I need to open the scanner using the scanner's SourceID. The problem is that there is no good way of getting the source id of the scanner that was chosen within the TWAINSelectSource dialog. I can loop through the available WIA scanners using the WIAGetSourceName method, but the WIA source Name's don't match the names that were previously given when calling the TWAINGetSourceName method, so there is no good way to match the scanner that they chose to the appropriate WIA SourceID.

I know that you are going to say not to use WIA scanning, but unfortunately they show up in the TWAINSelectSource dialog, so user's will naturally choose them. Plus, I need my user's to be able to use the WIA driver in the event that the TWAIN driver doesn't work, as is the case with my Xerox Documate 510 scanner, which will not open when scanning in a separate thread.

What would be the best way to correctly match a WIA scanner chosen from the TWAINSelectSource dialog to the appropriate WIASourceID?

Thanks,
Reagan

Hi,

I know that you are going to say not to use WIA scanning,

Absolutely. And I repeat myself: Don't use TWAIN to WIA bridge driver in TWAIN scanning sessions. Or at least, do not expect to get things working with this approach, especially with scanner having document feeder.
If you want to use WIA driver, use WIA scanning session through the "WIA" prefixed methods.

IE:

http://office.microsoft.com/en-us/help/ ... 98310.aspx

WIA drivers may not work for scanners that have automatic document feeders. If your scanner has an automatic document feeder, you should install and use the TWAIN driver for best results.

but unfortunately they show up in the TWAINSelectSource dialog, so user's will naturally choose them

The solution is very simple: Implement your own TWAIN driver selection dialog box and do not expose driver name starting by "WIA".

Let me know if you need special precision on this point.

Kind regards,

Loïc