C# detect the barcode from the pdf flie

Question

Hi 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.

Kip Hackman · Answer

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}
Barcode Value: {data.Value}
Barcode Bounds: {dat a.Bounds}" ); }

bhavani siva · Answer

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 siva · Answer

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 { 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 D · Answer

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 { 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 Jangid · Answer

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 Shekar · Answer

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