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December 23, 2008 at 7:40 am #24739
If you need to make a DLL to use TWAIN through JNI, the EZTwain classic library is a good start. We modified it to implement disk and buffered memory transfers and it saved us quite some time.
Also, duplex should be just setting CAP_DUPLEXENABLED and then scanning normally with no changes. You get the two sides as if they were different papers in single-side scanning.