有没有一个QR码API可以帮助检测PDF内的QR条形码?发现QR码后,我想拆分PDF。
请从Nuget使用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;
}
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");
}