(iTextSharp.text.pdf.parser) dosn't exist about itextsharp.lgplv2.core

[VahidN]

Yes. It's based on the iTextSharp 4.x, not 5.x and has a different design and license.
PdfTextExtractor exists in v5.0.2+ with AGPL license.

[VahidN]

Added Detect_Blank_Pages_In_Pdf sample.

[pMonfared]

How can detect blank page in PDF with this version?

[pMonfared]

Detect Blank Page maybe use font and don't use text?
how can detect page like that?

[pMonfared]

i use below to detect blank page but don't work with (page with use font but don't use text)
(i need make a new PDF without blank page by current PDF)

private static void RemoveBlankPdfPages(string pdfSourceFile)
        {
            
                var pdfReader = new PdfReader(pdfSourceFile);
                var raf = new RandomAccessFileOrArray(pdfSourceFile);

                var document = new Document(pdfReader.GetPageSizeWithRotation(1));
                var ss = new FileStream(pdfSourceFile.Replace(".pdf", "[temp][file].pdf"), FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
                var writer = new PdfCopy(document, ss);
                document.Open();
                const int blankThreshold = 20;
                for (var i = 1; i <= pdfReader.NumberOfPages; i++)
                {
                    using (var bs = new MemoryStream())
                    {

                        var pageDict = pdfReader.GetPageN(i);
                        var resDict = (PdfDictionary)pageDict.Get(PdfName.Resources);
                        var detectBlank = false;

                        var hasFont = resDict.Get(PdfName.Font) != null;
                        if (hasFont)
                        {
                            Console.WriteLine($"Page {i} has font(s).");
                            detectBlank = false;
                        }
                        else
                        {
                            var hasImage = resDict.Get(PdfName.Xobject) != null;
                            if (hasImage)
                            {
                                Console.WriteLine($"Page {i} has image(s).");
                                detectBlank = false;
                            }
                            else
                            {
                                detectBlank = true;
                            }
                        }



                        var bContent = pdfReader.GetPageContent(i, raf);
                        if (bContent.Length <= blankThreshold)
                        {
                            Console.WriteLine($"Page {i} is blank");
                            detectBlank = true;
                        }

                        if (detectBlank) continue;

                        bs.Write(bContent, 0, bContent.Length);
                        var page = writer.GetImportedPage(pdfReader, i);
                        writer.AddPage(page);

                    }

                }
                document.Close();
                ss.Dispose();
                writer.Close();

                raf.Close();
                pdfReader.Close();


            lock (Lock)
            {
                File.Delete(pdfSourceFile);
                File.Move(pdfSourceFile.Replace(".pdf", "[temp][file].pdf"), pdfSourceFile);
            }
        }

[VahidN]

You should adjust the blankThreshold value.

[lock]

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