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.
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If you want to choose scanners, it may not be the first available Source (the camera may be first), so you should instead try to show a Select Source dialog by invoking
DG_CONTROL / DAT_IDENTITY / MSG_USERSELECToperation during State 3 of your TWAIN app. When you select a source and confirm, you should be able to get the Source's info and type in theTW_IDENTITYstruct that you passed.