barcode scanner reader

Do you mean you want an application to scan an image, and after scanning, it will automatically read the barcode of the scanned image?

If this is what you need, you can acquire the image using Twain, put it in a bitmap, and then pass it to a barcode engine to recognize the code inside it (if any).

I searched on the Internet for some links to help you, and found that there is a commercial toolkit that should help you. you can check these 2 links:

How to Acquire from the Twain Source:

Reading Barcodes: