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- Abhinav Shrivastava
Hello,
HP Color LaserJet Pro M478f-9f TW does not scan more a page from ADF tray. This is a combo scanner having both ADF and Flatbed. Scan from Flatbed is working properly.
We are scanning through our Windows desktop application written in .NET 4.6. and we are using NTwain library version 3.7.1. to acquire images from Twain device. NTwain version 3.7.1 is based on Twain 2.3.
HP scanner has Twain 2.1 driver.
The same application is able to scan from EPSON (ADF plus Flatbed), Kodak ADF and Fujitsu ADF scanners.
Please suggest.
Thanks,
AbhinavAbhinav ShrivastavaHello,
Is anyone aware of any known issues with using NTwain library with HP scanners ?
Thanks
Fethiye ToursHello, any fix found?
Abhinav ShrivastavaHello,
No. I am not able to fix the issue.
To investigate the issue further I took the following steps –
1. Downloaded the NTwain 3.7.4 source code from “https://github.com/soukoku/ntwain”.
2. Added the source code in the project and put debug log statements inside the DoTransferRoutine() and DoImageNativeXfer() functions in the Internals\\TransferLogic.cs file.
3. Generated logs tell me that after the first page scan, the PendingXfers.Count becomes 0 and the execution comes out of the While loops that scans multiples pages.Some other points –
1. I am experiencing the same issue with HP ScanJet Pro 2600 f1 Scanner ( Twain version 2.4 and Ntwain version 3.7.4) .
2. The ADF tray gets empty but the application using NTwain does not get multiple pages. The TransferReady() and DataTransferred() events of the NTwain are triggered just once (ie, for the first page).Thanks
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