No device for twaindsm.dll

[marc77]

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

[gakujin]

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++.

[marc77]

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

[Kaij]

@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

[Author]

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