Scan QR Code from PDF using C#. For more information, please follow link: https://kb.groupdocs.com/parser/net/scan-qrcode-from-pdf-using-csharp/

Scan QR Code from PDF using C#.cs

using GroupDocs.Parser;
using GroupDocs.Parser.Data;
using System;
using System.Collections.Generic;
using System.Linq;

namespace ScanQRCodefromPDFusingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Apply the license to remove the restrictions imposed 
            // by the Parser library
            License lic = new License();
            lic.SetLicense(@"GroupDocs.Parser.lic");

            // Instantiate an object of the Parser class to enable access to its
            // methods and properties for processing or manipulating data
            using (Parser parser = new Parser("input.pdf"))
            {
                // Verify if the file is compatible for QR extraction
                if (!parser.Features.Barcodes)
                {
                    Console.WriteLine("The file doesn't support QR extraction.");
                    return;
                }

                // Scan and extract only the barcodes of type "QR" from your file
                IEnumerable<PageBarcodeArea> qrcodes = parser.GetBarcodes()
                    .Where(i => i.CodeTypeName == "QR");

                // Iterate over QR codes
                foreach (PageBarcodeArea qrcode in qrcodes)
                {
                    // Print the page index
                    Console.WriteLine("Page: " + (qrcode.Page.Index + 1));
                    // Print the barcode value
                    Console.WriteLine("Value: " + qrcode.Value);
                }
            }
        }
    }
}