使用C#检测.pdf内的QR码所需的QR码API

时间:2017-06-02 19:12:29

标签: qr-code

有没有人知道有助于检测.PDF内的QR条码的QR码API。我想在找到QR码时分解.pdf

2 个答案:

答案 0 :(得分:1)

有很多SDK / API能够检测到&解码PDF中的QR条码。您还必须考虑如何输入PDF并将其拆分。

您没有指定您正在开发的平台/编程语言,因此我将列出一些不同的语言。

如果您正在寻找用于检测QR条形码的开源解决方案,那么您可以使用ZXing:

  • ZXing .NET移植到.NET和C#,以及相关的Windows平台

如果您正在寻找更完整的解决方案,可以考虑使用商业(非免费)SDK。就像免责声明一样,我为LEADTOOLS工作,我们有Barcode SDK

LEADTOOLS还可以加载和拆分多页PDF作为条形码SDK的一部分,因此您可以使用1 SDK来实现您想要的效果。这是一个小型的C#.NET方法,它将根据每个页面上的QR条形码分割多页PDF:

static void SplitPDF(string filename)
{
   BarcodeEngine barcodeEngine = new BarcodeEngine();
   List<int> PageNumbers = new List<int>();
   using (RasterCodecs codecs = new RasterCodecs())
   {
      int totalPages = codecs.GetTotalPages(filename);
      for (int page = 1; page <= totalPages; page++)
         using (RasterImage image = codecs.Load(filename, page))
         {
            BarcodeData barcodeData = barcodeEngine.Reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR);
            if (barcodeData != null) // QR Barcode found on this image
               PageNumbers.Add(page);
         }
   }

   int firstPage = 1;
   PDFFile pdfFile = new PDFFile(filename);
   //Loop through and split the PDF according to the barcodes
   for(int i= 0; i < PageNumbers.Count; i++)
   {
      string outputFile = $"{Path.GetDirectoryName(filename)}\\{Path.GetFileNameWithoutExtension(filename)}_{i}.pdf";
      pdfFile.ExtractPages(firstPage, PageNumbers[i] - 1, outputFile);
      firstPage = PageNumbers[i]; //set the first page to the next page
   }
   //split the rest of the PDF based on the last barcode
   if (firstPage != 1)
      pdfFile.ExtractPages(firstPage, -1, $"{Path.GetDirectoryName(filename)}\\{Path.GetFileNameWithoutExtension(filename)}_rest.pdf");
}

答案 1 :(得分:1)

使用Nuget的Spire.Pdf和Spire.Barcode。

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;

using System.Web.UI;
using System.Web.UI.WebControls;
using Spire.Pdf;
using Path = System.IO.Path;

namespace MyTask
{
    public partial class Index : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            GetImages(@"C:\Users\prave\Desktop\my.pdf", @"C:\Users\prave\Desktop");
        }

        private static void GetImages(string sourcePdf, string outputPath)
        {
            PdfDocument doc = new PdfDocument();
            doc.LoadFromFile(@"C:\Users\prave\Desktop\my.pdf");

            for (int i = 0; i < doc.Pages.Count; i++)
            {
                PdfPageBase page = doc.Pages[i];

                System.Drawing.Image[] images = page.ExtractImages();
                outputPath = Path.Combine(outputPath, String.Format(@"{0}.jpg", i));
                foreach (System.Drawing.Image image in images)
                {
                    string QRCodeString = GetQRCodeString(image,outputPath);
                    if (QRCodeString == "")
                    {
                        continue;
                    }

                    break;

                }



            }
        }

        private static string GetQRCodeString(System.Drawing.Image img, string outPutPath)
        {

            img.Save(outPutPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            string scaningResult = Spire.Barcode.BarcodeScanner.ScanOne(outPutPath);
            File.Delete(outPutPath);

            return scaningResult;
        }