How to detect scanner, not cameras, using TWAIN

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October 3, 2020 at 2:14 am #52567 Reply
Oleg
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I develop app using TWAIN scanners. I need to choose only scanners, not cameras or something else. I cant’t see any info about device type in command response DG_CONTROL / DAT_IDENTITY /MSG_GETFIRST.
October 29, 2020 at 8:11 am #52608 Reply
MarkM
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Sadly, there is no way to do that from TWAIN. One way to do it is to enum the #### keys in the registry at this location: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{6bdd1fc6-810f-11d0-bec7-08002be2092f}

She the DeviceType, and look at this site for information: https://docs.microsoft.com/en-us/windows-hardware/drivers/image/inf-files-for-still-image-devices

Matching the Vendor to the TW_IDENTITY.Manufacturer may get you close.
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