Before QR Codes, there was the CueCat (2006)

In celebration of the upcoming Coding4Fun Redesign, the author has been given permission to publish a Coding4Fun article on his website as an exclusive. This article will be republished on the redesigned site along with other articles related to coding with a fingerprint reader and an IR/robot/PowerShell project. The article discusses the use of the CueCat barcode scanner with .NET, decoding the encoded format of the scanner, converting UPC codes into ISBNs, and integrating with Windows Live Writer to easily blog about books using the scanner. The author also provides code examples for decoding and converting the barcodes. The article ends with instructions on how to integrate the barcode scanner with Windows Live Writer using a plugin.

https://www.hanselman.com/blog/coding4fun-hardware-boneyard-using-the-cuecat-with-net

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