Reading QR code from Pdf

Question

Hello everyone and thanks for the help in advance. I need to develop a C# application that can locate and read QR multiple QR codes from a Pdf file. The QR codes are on stickers that are affixed to a piece of paper and scanned into the system. I know that the location of the QR codes must be known in order to reasonably do this and I do have some control on the placement of them, but I need to figure out how to accomplish the project. I know the Pdf must be converted to an image, likely using Ghostscript or ImageMagick, but am not sure how to proceed after that point. Any help would be appreciated.

Answer 1

You can convert PDF to images with Windows.Data.Pdf
(for Winforms or WPF, add references :
"C:\Program Files (x86)\Windows Kits\10\UnionMetadata\[Version]\Windows.winmd"
"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETCore\v4.5\System.Runtime.WindowsRuntime.dll" )
(tested on Windows 10 21H1)

To read QR codes, you can find libraries like
QR Code Encoder and Decoder C# Class Library for VS 2022 .NET 6.0 (Version 3.1.0)
or
ZXing.Net
(not tested)

Answer 2

Pdf not open

Answer 3

Pdf not open