C# TWAIN interaction

Question

Hello,

I'm trying to set up a C# application which uses TWAIN example from http://www.codeproject.com/KB/dotnet/twaindotnet.aspx

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.

Answer 1

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.

Answer 2

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.

Answer 3

I've just wrapped up the code from Thomas Scheidegger's article (CodeProject: .NET TWAIN image scanning) into a Google code project: http://code.google.com/p/twaindotnet/

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.