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PODocument.NewPage giving object referance not set to an instance of an object
 

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  1. PODocument.NewPage giving object referance not set to an instance of an object
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    <p>I'm new to creating pdfs, and successfully had one working but no footer, so I've been looking around and based myself on <a href="http://www.codeproject.com/Tips/573907/Generating-PDF-using-ItextSharp-with-Footer-in-Csh" rel="nofollow">this</a></p> <p>This is the code I have of it:</p> <pre><code>string nome = "MapaAnual" + DateTime.Now.Year.ToString() + "_" + DateTime.Now.Month.ToString() + "" + DateTime.Now.Day.ToString() + ".pdf"; string outputFile = "C:\\Users\\sies4578\\Documents\\Visual Studio 2012\\Projects\\ULSM_Equipamentos\\REL\\" + nome.ToString(); try { //Create a standard .Net FileStream for the file, setting various flags //FileStream fs = new FileStream(outputFile, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite); System.IO.FileStream fs = new System.IO.FileStream(outputFile + DateTime.Now.ToString("ddMMyyHHmmss") + ".pdf", System.IO.FileMode.OpenOrCreate); //Create a new PDF document setting the size to A4 Document doc = new Document(PageSize.A4.Rotate()); //Bind the PDF document to the FileStream using an iTextSharp PdfWriter PdfWriter w = PdfWriter.GetInstance(doc, fs); w.PageEvent = new MyPageEventHandler(); //Open the document for writing doc.Open(); for (int i = 0; i &lt; listaServicos.Count; i++) { doc.NewPage(); //where it goes to the catch giving that error #region Calibracoes //Code that doesn't matter #endregion } doc.Close(); Process.Start(outputFile); return "PDF criado com sucesso"; } catch (Exception ex) { Console.WriteLine("An error ocurred, the PDF-document could not be created."); return ex.Message; } </code></pre> <p>I doubt it's related but as asked here is the code of MyPageEventHandler:</p> <pre><code> public class MyPageEventHandler : iTextSharp.text.pdf.PdfPageEventHelper { // This is the contentbyte object of the writer PdfContentByte cb; // we will put the final number of pages in a template PdfTemplate template; // this is the BaseFont we are going to use for the header / footer BaseFont bf = null; // This keeps track of the creation time DateTime PrintTime = DateTime.Now; protected iTextSharp.text.Font footer { get { // create a basecolor to use for the footer iTextSharp.text.Font, if needed. BaseColor grey = new BaseColor(128, 128, 128); iTextSharp.text.Font font = iTextSharp.text.FontFactory.GetFont("Arial", 9, iTextSharp.text.Font.NORMAL, grey); return font; } } public override void OnStartPage(PdfWriter writer, Document doc) { //Inicio Cabeçalho Logo //Inicio Cabeçalho Logo PdfPTable cabecalho = new PdfPTable(3); cabecalho.DefaultCell.Border = 0; cabecalho.DefaultCell.HorizontalAlignment = Element.ALIGN_CENTER; cabecalho.TotalWidth = 700; float[] width1 = { 150.0F, 550.0F, 550.0F }; cabecalho.SetWidths(width1); cabecalho.LockedWidth = true; iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance("C:\\ULSMatosinhos\\Software\\ULS-Matosinhos\\Images\\logopro.png"); cabecalho.AddCell(im); iTextSharp.text.Font cabeca = new iTextSharp.text.Font(iTextSharp.text.FontFactory.GetFont("arial", 14, iTextSharp.text.Font.BOLDITALIC, new BaseColor(23, 181, 150))); PdfPCell linha = new PdfPCell(new Phrase("PLANO DE CALIBRAÇÕES - " + anoCalibracao.ToString(), cabeca)); linha.Border = 0; linha.HorizontalAlignment = 1; linha.VerticalAlignment = Element.ALIGN_MIDDLE; cabecalho.AddCell(linha); iTextSharp.text.Font cd = new iTextSharp.text.Font(iTextSharp.text.FontFactory.GetFont("arial", 8, iTextSharp.text.Font.NORMAL, BaseColor.BLACK)); PdfPCell codigoDoc = new PdfPCell(new Phrase(" 591_00_SIE_1191", cd)); codigoDoc.Border = 0; codigoDoc.HorizontalAlignment = 1; codigoDoc.VerticalAlignment = Element.ALIGN_MIDDLE; cabecalho.AddCell(codigoDoc); doc.Add(cabecalho); } public override void OnEndPage(PdfWriter writer, Document document) { base.OnEndPage(writer, document); int pageN = writer.PageNumber; String text = "Page " + pageN + " of "; float len = bf.GetWidthPoint(text, 8); iTextSharp.text.Rectangle pageSize = document.PageSize; cb.SetRGBColorFill(100, 100, 100); cb.BeginText(); cb.SetFontAndSize(bf, 8); cb.SetTextMatrix(pageSize.GetLeft(40), pageSize.GetBottom(30)); cb.ShowText(text); cb.EndText(); cb.AddTemplate(template, pageSize.GetLeft(40) + len, pageSize.GetBottom(30)); cb.BeginText(); cb.SetFontAndSize(bf, 8); cb.ShowTextAligned(PdfContentByte.ALIGN_RIGHT, "Printed On " + PrintTime.ToString(), pageSize.GetRight(40), pageSize.GetBottom(30), 0); cb.EndText(); } public override void OnCloseDocument(PdfWriter writer, Document document) { base.OnCloseDocument(writer, document); template.BeginText(); template.SetFontAndSize(bf, 8); template.SetTextMatrix(0, 0); template.ShowText("" + (writer.PageNumber - 1)); template.EndText(); } } </code></pre>
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    1. PTQuestion
    1. USMicael Florêncio
    1. USMicael Florêncio
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    1. COCan you provide a stack trace? And if `MyPageEventHandler` is involved in it, supply its code, too, please.
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      1. PODocument.NewPage giving object referance not set to an instance of an object
      1. USmkl
    2. CO@mkl Stack trace? I doubt it's involved but I can add it.
      singulars
      1. PODocument.NewPage giving object referance not set to an instance of an object
      1. USMicael Florêncio
    3. CO`MyPageEventHandler.cb` is not set to a value but it is used in `MyPageEventHandler.OnEndPage`, `cb.SetRGBColorFill(100, 100, 100);` etc. Here, therefore, you will automatically get the error you mentioned. Furthermore, you add content to the document in `MyPageEventHandler.OnStartPage`. iText developers will tell you that `OnStartPage` is not designed for that and doing so likely will cause funny effects some time later. Furthermore you add to the `doc`; the page events are not designed for this either, more funny effects may come up.
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      1. PODocument.NewPage giving object referance not set to an instance of an object
      1. USmkl
 

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