C# detect the barcode from the pdf flie

bhavani siva

7y4.8kLearn iOS Programming

Is there any way to detect the barcode from the given pdf file(pdf path) ??

with out using third party librarys.

I was try to use zxing .but it is not working properly.

i was try to spire.pdf .it is also not working properly when the pdf file having more than one page .

Please help me.

I need to decode the barcode of pdf file(this file contain more than 1 page) .need to get the result in array format .

this array contain the all pages of single pdf file barcode values.

6 Replies

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Kip Hackman6y ago
You can use LEADTOOLS Barcode SDK technology in your application.
https://www.leadtools.com/sdk/barcode

Here is some sample code:
// Load PDF as image
using (RasterCodecs codecs = new RasterCodecs)
using (RasterImage image = codecs.Load(@"PDF FILE PATH"))
{
   // initialize BarcodeEngine and Reader
   BarcodeEngine barcodeEngine = new BarcodeEngine();
   BarcodeReader barcodeReader = barcodeEngine.Reader;
   // Passing LeadRect as empty searches the entire PDF for the barcode
   BarcodeData data = barcodeReader.ReadBarcode(image, LeadRect.Empty, BarcodeSymbology.Unknown);
   // Display barcode data
   Console.WriteLine($"Barcode Symbology: {data.Symbology}\nBarcode Value: {data.Value}\nBarcode Bounds: {dat   a.Bounds}");
}
bhavani siva7y ago
Hi All ,

by using the iTextSharp,

based this link

https://www.c-sharpcorner.com/UploadFile/9f539d/scan-barcode-from-pdf-using-itextsharp/

in my main method i was write the below code
GetImages("D:\\Smartkey_test\\FSSORUCE\\123.pdf");
below is the method implementation
private static void GetImages(string filename)
{
int pageNum = 1;
PdfReader pdf = new PdfReader(filename);
PdfDictionary pg = pdf.GetPageN(pageNum);
PdfDictionary res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
PdfDictionary xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
if (xobj == null) { return; }
foreach (PdfName name in xobj.Keys) //////i have barcode in my pdf file but xobj.keys shows '0' count
{
PdfObject obj = xobj.Get(name);
if (!obj.IsIndirect()) { continue; }
PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
PdfName type = (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
if (!type.Equals(PdfName.IMAGE)) { continue; }
int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(System.Globalization.CultureInfo.InvariantCulture));
PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
PdfStream pdfStrem = (PdfStream)pdfObj;
byte[] bytes = PdfReader.GetStreamBytesRaw((PRStream)pdfStrem);
if (bytes == null) { continue; }
using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(bytes))
{
memStream.Position = 0;
System.Drawing.Image img = System.Drawing.Image.FromStream(memStream);
string path = System.IO.Path.Combine(String.Format(@"result-{0}.jpg", pageNum));
System.Drawing.Imaging.EncoderParameters parms = new System.Drawing.Imaging.EncoderParameters(1);
parms.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, 0);
var jpegEncoder = ImageCodecInfo.GetImageEncoders().ToList().Find(x => x.FormatID == ImageFormat.Jpeg.Guid);
img.Save(path, jpegEncoder, parms);
}
bool imageExist = File.Exists(String.Format(@"result-{0}.jpg", pageNum));
if (imageExist)
{
string scaningResult = Spire.Barcode.BarcodeScanner.ScanOne(String.Format(@"result-{0}.jpg", pageNum));
Console.WriteLine(scaningResult);
}
Console.WriteLine("Done!");
Console.ReadLine();
}
}
Please help me out.

I want to read the barcode values from the pdf file with out using third party libraries. i want to using only c# and nuget packages.

Please.
bhavani siva7y ago
Hi All Thanks,

but i did not find the solution please help me out.

using Spire.Barcode;
using Spire.Pdf;

PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"D:\Smartkey_test\FSSORUCE\5001739292.pdf");
for (int i = 0; i < doc.Pages.Count; i++) //here i got 10 as count.
{
System.Drawing.Image bmp = doc.SaveAsImage(i);
string fileName = string.Format("Page-{0}.png", i + 1);
bmp.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
string[] data = Spire.Barcode.BarcodeScanner.Scan(fileName, Spire.Barcode.BarCodeType.Code128); // i need to get the barcode value ..but it does not work please help
}
Leon D7y ago
Using Spire.PDF, you can use code like below to loop through the pages in the PDF file, convert every page to an image.
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"C:\Users\Administrator\Desktop\sample.pdf");

for (int i = 0; i < doc.Pages.Count; i++)
{
    System.Drawing.Image bmp = doc.SaveAsImage(i);
    string fileName = string.Format("Page-{0}.png", i + 1);
    bmp.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
}
After that you can scan the images using Spire.Barcode.

https://www.e-iceblue.com/Tutorials/Spire.Barcode/Spire.Barcode-Program-Guide/How-to-Scan-Barcode-in-C.html

Hope it helps.
Gajendra Jangid7y ago
There are a tonne of examples on how to do each step on Google Search. Here is a solution based on a Google Search that I used...

https://psycodedeveloper.wordpress.com/2013/01/10/how-to-extract-images-from-pdf-files-using-c-and-itextsharp/
https://www.codeproject.com/Articles/57100/Simple-and-Free-PDF-to-Image-Conversion
https://www.codeproject.com/Articles/42852/Reading-Barcodes-from-an-Image-III
Madan Shekar7y ago
go through this blog

https://www.c-sharpcorner.com/UploadFile/9f539d/scan-barcode-from-pdf-using-itextsharp/