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No device for twaindsm.dll

Forums › TWAIN Classic › No device for twaindsm.dll

  • This topic has 3 replies, 3 voices, and was last updated 8 years, 8 months ago by Kaij.
Viewing 4 posts - 1 through 4 (of 4 total)
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    Posts
  • May 28, 2012 at 10:31 am #22757 Reply
    marc77
    Participant
    • Topics - 2
    • Replies - 2
    • Total Posts - 4

    Hello all,
    I’m trying to use the twaindsm.dll for a native x64 application.

    The problem is that I get the “select source” dialog but it is not populated with any scanner choice. I have an Epson 4490 Photo installed with it’s native drivers.
    If I switch to 32bit application and the twain_32.dll, all seems to work fine.

    How can I get the scanner managed by the twaindsm.dll for my 64bit application?

    Thank you very much and have anice day!!!!

    Best Regards.
    Marc

    May 29, 2012 at 12:33 pm #25623 Reply
    gakujin
    Participant
    • Topics - 0
    • Replies - 1
    • Total Posts - 1

    I’m actually having the exact same problem. Willing to share code sample if necessary. Running on Microsoft Windows 7 64-bit home edition. My sample code is being compiled with MinGW 64 bit g++.

    May 30, 2012 at 4:29 pm #25624 Reply
    marc77
    Participant
    • Topics - 2
    • Replies - 2
    • Total Posts - 4

    Hello,
    I geuss I need even the datasource being compiled in 64bit. Having the scanner original datasource is not enough if this is 32bit.
    As long as I was not able to find the 64 bit version of the file per4990.ds for my Epson Perfection 4990 Photo scanner, I think there is no solution to get the DSM working with 32bit datasources from a native 64bit software version.

    What are your thoughts about that?

    Thanks a lot and have a nice day!!!!

    Marc

    May 31, 2012 at 4:47 pm #25625 Reply
    Kaij
    Participant
    • Topics - 9
    • Replies - 132
    • Total Posts - 141

    @marc77 wrote:

    I think there is no solution to get the DSM working with 32bit datasources from a native 64bit software version.
    Marc

    That is correct. The 64 bit version TWAINDSM.DLL running on a 64 bit Windows can only work with 64 bit DS. Therefore 32 bit DS are not visible for 64 bit applications.

    The consequesce is that

    a) you need to have a 64 bit DS if you want to use a 64 bit application

    or

    b) you need to use a 32 bit application if you have only 32 bit DS available

    I hope this gives clarifcation.

    Best regards,

    Kaij
    http://www.jse.de

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Viewing 4 posts - 1 through 4 (of 4 total)
Reply To: No device for twaindsm.dll
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