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I need to write a c# assembly (DLL) in order to scan documents.
I don't know if I need to use TWAIN or WIA.
Anyone could help me please ?
What are the différences?
What are your advices ?
Is there a c# Library ?
Generally, if your application is to interact with scanners, TWAIN is recommended. While for cameras, WIA offers better support.
So for document scanning solution, I would recommend TWAIN.
TWAIN.H file is a C/C++ header file. If you want to code it to .NET yourself, you can refer to this post to get some resources:
Using TWAIN in .NET - Looking for resources
Or you can use a commercial .NET TWAIN component.
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I am looking for a C# library to generate and read micro QR codes (example below). It would be great if the llibrary could recognise a micro QR code in an image with other things in it (i.e. isolate and read the QR code.)
There is an open source project called QRCode.
QRCode library is a .NET component that can be used to encode and
decode QRCode.
Did not work very well for me.
Try google codes .net port http://zxingnet.codeplex.com/
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I searching for a free .Net (C#) library that iIcan use to scan from a document scanner, and then OCR the document, so I can get the text from it to save in a database.
After some search I can not find anyone working in Visual Studio 2010 and .Net 4. Someone knows any libs that works like this?
You can use WIA library to control the scanning process and tesseractdotnet for OCR. An updated .NET 4.0 version can be found here.
Updated link to .NET wrapper here
I think this may be usef for you Tessnet2 a .NET 2.0 Open Source OCR Library
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Do you know any opensource libraries for DJVU? I can't find anything useful.
One of the most rated DjVU library is here:
DjVuLibre
However is in C++.
I created an open source Djvu library which is written in C#. It needs to be optimized a bit, but is fully usable. https://github.com/Telavian/DjvuNet
As for open source DjVuLibre mentioned by Steve, you could find some pointers how to use it from .NET here - Creating simple c++.net wrapper. Step-by-step
As for paid libraries - you could look at: Caminova DjVu SDK for .NET Framework. This is not too expensive.
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I am looking for any open source/free graph(charting) library in C/C++ or C#. Just like free JfreeChart in java.
Does anyone know it?
I'm a big fan of gnuplot... It's open-source and very versatile.
You can try Microsoft Chart Controls for Microsoft .NET Framework 3.5 for .Net.
Samples are also available.
Take a look at MathGL
DynamicDataDisplay for C# is free and a quite efficient way of charting data. It supports quick pans and zooms.
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Any recommendations for an open source (free) C# library/application for a C# Windows Application that could be used for: (a) creating license/product keys and (b) has library that can be used within the code to perform a check to see whether the entered license key is valid?
(I've seen other posts which cover commercial products, but here I'm looking for a ready-to-go tool with library that can be used in a C# windows application)
The .NET framework has a built-in licensing model (MSDN).
See also Applications Licensing using the .NET Framework on Developer.com
What about rhino-licensing? Here is an introductory license: Rhino Licensing