Windows: No scan source available

Tim wrote:in Xnview MP 0.82 there is no scan source available, i have a Canon 9000F M2, in xnview classic the scanner works fine (there are two scan-sorces, Canon 9000 and WIA-Canon 9000), in xnview MP there is nothing to choose from ...

cday wrote:In XnView MP x64 scanning using the TWAIN interface normally isn't available due to a lack of support in Windows (which can be overcome using a third-party utility) and also lack of support by most scanner manufacturers. Note that scanner manufacturers' x64 bit software normally actually interfaces using the Windows x32 bit TWAIN interface. That's about right, isn't it XnTriq?

Atalasoft Knowledge Base (FAQ: Common Problems with x64 TWAIN Scanning) wrote:The reason your scanner is missing when you compile as a x64 bit application is that your scanner doesn't have a 64-bit TWAIN driver. Yes, it supports your 64-bit operating system, but it is still only a 32-bit driver and 32-bit implementation of TWAIN. In order to show up to TWAIN in a 64-bit application it needs to implement the full 64-bit TWAIN interface. This limitation is not unique to us, all products that use TWAIN have this same exact limitation.

cday (0.65 - W8/x64: TWAIN Source / TWAIN scan) wrote:Googling 'Windows 64 TWAIN' there is clearly a widespread problem using scanners over a TWAIN interface in 64-bit versions of Windows.

The following text from this link may possibly shed some light on the issue:

http://altoimaging.typepad.com/alto-imaging-technologies/2010/08/64-bit-vs-32-bit-eventually-the-twain-shall-meet.html

To our knowledge (based on examining a fairly large number of popular scanners), there are no 64-Bit TWAIN drivers available. They are all running in 32-Bit compatibility mode on 64-Bit PCs. This means that the 32-Bit versions of the apps can use the 32-Bit TWAIN drivers and access a scanner as it would in the 32-Bit OS. But, the 64-Bit versions of the apps cannot access the 32-Bit drivers.

Some scanner suppliers are apparently advertising drivers as 32/64-Bit compatible. This could mean that they are packaging both versions in the driver install file. But, please be aware that in most cases we have seen, it only means that the drivers will work in both 32-Bit and 64-Bit versions of Windows. As discussed above, you can use the 32-Bit drivers in 64-Bit Windows, but only with 32-Bit applications.

I'm not sure whether the following freeware software might be of any help in overcoming this issue:

http://sourceforge.net/projects/twain-dsm/files/

I read a while back something about scanner manufacturers and Microsoft agreeing not to support TWAIN 64 for some reason, but the present situation seems bizare...

• XnView Forums
  
  • Twain (Select Twain Source and TWIAN Scan)
  • Missing scanning option
  • Scanner in XnViewMP
  • Acquisition Twain
• TWAIN Forum
  
  • Is there any 64bit virtual scanner?
  • 64-bit TWAIN only sees 64-bit TWAIN drivers?
  • 64 bits TWAIN scanning application
  • Twain driver on Windows 7 64 bit
  • TWAIN and Windows x64
• Stefan Lindblad
  
  • Scanning CorelDRAW X6 64 bit a macro from SoftBotz Software Studio (25/Mar/2012)
• Graphics Unleashed
  
  • CorelDRAW X6, 64-bits, Scanning, Twain Drivers and WIA (26/Mar/2012)
• dosadi
  
  • TWAIN 64bit/32bit Bridge (now Atalasoft EZTwain)
• ScanWorks
  
  • TwainImporter
• Terminal Works
  
  • UniTwain
• TWAIN Working Group
  
  • TWAIN 2.3 Specification