What does it mean when TwainOpenDefaultSource returns zero. According to the documentation the value must be -1 or betweeen 1 and 7.

I have a question for sample 4.
Is it possible to create a multipage searchable PDF from an existing multipage PDF without using the gdp-viewer.
Because the viewer isn't included in GdPicture Light Imaging Toolkit.

Can I scan to pdf and then create a searchable pdf file using GdPicture Light Imaging Toolkit plus the ocr plugin?
And what is the difference between GdPicture.NET 7 - Document Imaging SDK and GdPicture.NET Image SDK?

I have 2 questions:
1.Why is the GdpPicture.Net Toolkit so much more expensive than the active x version?
2.According to your website I can perform OCR with GdPicture Pro Imaging SDK. For what then is the GdPicture Tesseract Plugin good?

Thanks

I used the standard dictionary path C:\Programme\GdPicture.NET\Redist\Commons\OCR

I tried to convert a pdf file to an pdf ocr file using the sample from GdPicture.Net "PDF to PDF-OCR".
I was able to produce a file, but the file isn't searchable for text. Do I have to modify the sample program to make it work?

Thanks for your help.