C# TWAIN interaction

Question

I'm trying to set up a C# application which uses TWAIN example from code project

This works fine except that I need to cast Form to IMessageFilter and call IMessageFilter.PreFilterMessage() to catch TWAIN callbacks.
Also I need to start this filtering by calling

Application.AddMessageFilter();

Is there a way to do same thing in WPF Window? (To add message filter and catch TWAIN callbacks).

Another totally high level question: Does anybody know about alternative C# TWAIN libraries\wrappers?

Thank you.

Nika

Answer 1

You could try it with the ComponentDispatcher.ThreadFilterMessage event.
As far as I understand, it serves the same purpose in WPF as Application.AddMessageFilter() in WinForms.

Pr

Answer 2

I've just wrapped up the code from Thomas Scheidegger's article (CodeProject: .NET TWAIN image scanning) into github project

I've cleaned up the API a bit and added WPF support, so check it out. :)

It has a simple WPF application that shows how the message filtering works with WPF.

Lifeless

Answer 3

I thought TWAIN is considered obsolete. Maybe take a look at WIA, that does this job since WinXP. There is also a sample at codeproject. About the WPF related question, no idea, I only used it in windows forms apps.

Cricket

driAn, TWAIN is older but not obsolete. It has vast devices support. Also, my scanner does not (oddly) support WIA. – Nika

Well, microsoft considers it being obsolete, they suggest using WIA instead. – Cricket

Hmm... There's no causal relation between Microsoft opinions and consensus reality, in either direction. I work with TWAIN, and at least for document scanning, WIA is obsolete and has been since it was introduced. They introduced it during a brief phase when they were excited about clobbering Apple. Then the Burning Eye turned to other things, and it has languished ever since. I recommend it for digital cameras though. – Dysphasia