How to Stamp Barcodes on PDFs

// Include the IronBarCode namespace to work with barcode generation and manipulation
using IronBarCode;

public class BarcodeHandler
{
    public static void Main()
    {
        // Generate a barcode with specific encoding and dimensions
        // - The first argument is the data to encode, e.g., a URL.
        // - The second argument specifies the type of barcode encoding (Code128 in this case).
        // - The third and fourth arguments specify the width and height of the barcode.
        GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode(
            "https://ironsoftware.com/csharp/barcode/", // Data to encode
            BarcodeEncoding.Code128, // Type of barcode encoding
            200, // Width of the barcode
            100  // Height of the barcode
        );

        // Stamp the generated barcode into an existing PDF file at a specified location
        // - The first argument is the file path to an existing PDF where the barcode will be stamped.
        // - The 'x' and 'y' parameters define the position on the PDF page where the barcode will be placed.
        // - The 'pageNumber' parameter specifies the page within the PDF file (PDF pages can be 1-indexed or 0-indexed based on the library).
        // - The last argument is for a password if the PDF is encrypted; otherwise, use null or an empty string if not needed.
        // Note: Ensure the pageNumber is correct as per the library conventions.
        myBarcode.StampToExistingPdfPage(
            "pdf_file_path.pdf", // File path to existing PDF
            x: 200, // X position on the page
            y: 100, // Y position on the page
            pageNumber: 2, // Page number in the PDF (1-indexed for IronBarCode)
            password: null // PDF password if encrypted, or null for no password
        );
    }
}

using IronBarCode;
using System;
using System.Collections.Generic;

// Generate a barcode of type Code128 with specified text, width, and height.
try
{
    GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode(
        "https://ironsoftware.com/csharp/barcode/", // The text or URL to encode in the barcode.
        BarcodeEncoding.Code128,                    // The type of the barcode encoding format.
        200,                                        // The width of the barcode in pixels.
        100                                         // The height of the barcode in pixels.
    );

    // List of page numbers where the barcode will be stamped.
    List<int> pages = new List<int>
    {
        1, // First page to stamp the barcode.
        2, // Second page to stamp the barcode.
        3  // Third page to stamp the barcode.
    };

    // Attempt to stamp the generated barcode onto the specified pages of an existing PDF file.
    myBarcode.StampToExistingPdfPages(
        "pdf_file_path.pdf",  // The path to the PDF file where the barcode will be stamped.
        x: 200,               // X-axis position for stamping the barcode on the page.
        y: 100,               // Y-axis position for stamping the barcode on the page.
        pages,                // Pages of the PDF where the barcode needs to be stamped.
        "password"            // Password for opening the PDF if it's password-protected.
    );
}
catch (Exception ex)
{
    Console.WriteLine("An error occurred: " + ex.Message);
}