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Append HTML header to Spire PDF

I am using Spire PDF to convert my HTML template to PDF file. Here is the sample code for the same:
class Program
{
static void Main(string[] args)
{
//Create a pdf document.
PdfDocument doc = new PdfDocument();
PdfPageSettings setting = new PdfPageSettings();
setting.Size = new SizeF(1000,1000);
setting.Margins = new Spire.Pdf.Graphics.PdfMargins(20);
PdfHtmlLayoutFormat htmlLayoutFormat = new PdfHtmlLayoutFormat();
htmlLayoutFormat.IsWaiting = true;
String url = "https://www.wikipedia.org/";
Thread thread = new Thread(() =>
{ doc.LoadFromHTML(url, false, false, false, setting,htmlLayoutFormat); });
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
thread.Join();
//Save pdf file.
doc.SaveToFile("output-wiki.pdf");
doc.Close();
//Launching the Pdf file.
System.Diagnostics.Process.Start("output-wiki.pdf");
}
}
This is working as expected but now I want to add Header and Footer to all the pages. Though adding header and footer is possible using SprirePdf but my requirement is to add HTML template to the Header which I am not able to achieve. Is there any way to render html template to Header and footer?

Spire.PDF provides a class PdfHTMLTextElement supporting to render simple HTML tags including Font, B, I, U, Sub, Sup and BR on a PDF page. You can append HTML to header space in an existing PDF document using the following code snippet. As far as I know, there is no way to render complicated HTML only as a part of the document by using Spire.PDF.
//load an existing pdf document
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(#"C:\Users\Administrator\Desktop\sample.pdf");
//loop through the pages
for (int i = 0; i < doc.Pages.Count; i++)
{
//get the specfic page
PdfPageBase page = doc.Pages[i];
//define HTML string
string htmlText = "<b>XXX lnc.</b><br/><i>Tel:889 974 544</i><br/><font color='#FF4500'>Website:www.xxx.com</font>";
//render HTML text
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 12);
PdfBrush brush = PdfBrushes.Black;
PdfHTMLTextElement richTextElement = new PdfHTMLTextElement(htmlText, font, brush);
richTextElement.TextAlign = TextAlign.Left;
//draw html string at the top white space
richTextElement.Draw(page.Canvas, new RectangleF(70, 20, page.GetClientSize().Width - 140, page.GetClientSize().Height - 20));
}
//save to file
doc.SaveToFile("output.pdf");

PDFsharp asking for a PDF to be opened for Import when adding pages

I have 3 PDFs, I want to add the pages from them to an output PDF file. What I’m trying to do is: import first PDF -> create new PDF document -> add pages -> draw in certain page and finally I want to add the pages from that document to the main PDF document that will be exported. Proceed to do the same with the second PDF file if needed.
ERROR: A PDF document must be opened with PdfDocumentOpenMode.Import to import pages from it.
From the main class I call the method that processes the PDF:
Pdftest pdftest = new Pdftest();
PdfDocument pdf = PdfReader.Open(#"C:\Users\pdf_file.pdf", PdfDocumentOpenMode.Import);
pdftest.CreatePages(pdf_file);
Pdftest class:
public class Pdftest
{
PdfDocument PDFNewDoc = new PdfDocument();
XFont fontChico = new XFont("Verdana", 8, XFontStyle.Bold);
XFont fontGrande = new XFont("Verdana", 12, XFontStyle.Bold);
XBrush fontBrush = XBrushes.Black;
public void CreatePages(PdfDocument archivoPdf)
{
PdfDocument NuevoDoc = new PdfDocument();
for (int Pg = 0; Pg < archivoPdf.Pages.Count; Pg++)
{
PdfPage pp = NuevoDoc.AddPage(archivoPdf.Pages[Pg]);
}
XGraphics Graficador = XGraphics.FromPdfPage(NuevoDoc.Pages[0]);
XPoint coordinate = new XPoint();
coordinate.X = XUnit.FromInch(1.4);
coordinate.Y = XUnit.FromInch(1.8);
graficador.DrawString("TEST", fontChico, fontBrush, coordinates);
for (int Pg = 0; Pg < NuevoDoc.Pages.Count; Pg++)
{
PdfPage pp = PDFNewDoc.AddPage(NuevoDoc.Pages[Pg]); //Error mentioned.
}
}
}

The error message relates to NuevoDoc. You have to save NuevoDoc in a MemoryStream and re-open it in Import mode to get your code going.
I do not understand why you try to copy pages from NuevoDoc to PDFNewDoc- so most likely you can avoid the MemoryStream when optimising the code.

How to add a Pdfptable little by little to a document when generating a Pdf from a Html

The application I'm working on generates pdf reports from html files using itextsharp library. Apparently, when large tables are generated, itextsharp allocates a lot of memory (~300 MB for a 200KB file).
A solution to this problem is adding the table little by little to the document (so all existing data in table will be flushed), as described in the following links:
IText Large Tables
How to reduce memory consumption of PdfPTable with many cells
Question: How can I add a pdfptable in steps when generating the pdf from an existing html file?
Here is my code:
public byte[] GetReportPdf(string template, string cssString)
{
byte[] result;
using (var stream = new MemoryStream())
{
using (
var doc = new Document(
this.Settings.Size,
this.Settings.Margins.Left,
this.Settings.Margins.Right,
this.Settings.Margins.Top,
this.Settings.Margins.Bottom))
{
using (var writer = PdfWriter.GetInstance(doc, stream))
{
// adding the page event, or null
writer.PageEvent = this.Settings.PageEvent;
doc.Open();
// CSS
var cssResolver = new StyleAttrCSSResolver();
using (var cssStream = new MemoryStream(Encoding.UTF8.GetBytes(cssString)))
{
var cssFile = XMLWorkerHelper.GetCSS(cssStream);
cssResolver.AddCss(cssFile);
}
// HTML
var fontProvider = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
var cssAppliers = new CssAppliersImpl(fontProvider);
var htmlContext = new HtmlPipelineContext(cssAppliers);
htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
// pipelines
var pdf = new PdfWriterPipeline(doc, writer);
var html = new HtmlPipeline(htmlContext, pdf);
var css = new CssResolverPipeline(cssResolver, html);
// XML worker
var worker = new XMLWorker(css, true);
var parser = new XMLParser(worker);
using (var stringReader = new StringReader(template))
{
parser.Parse(stringReader);
}
doc.Close();
}
}
result = stream.ToArray();
}
return result;
Notes:
The solution in the previous links are not using an html to create
the pdf
The steps described are: set table complete property to false, add every 50 table rows to the document, set the table complete property to true.
Using an AbstractTagProcessor, I managed to set the table complete property when the html is parsed, but found no option on how to trigger table adding while it's generated.
itextsharp version 5.5.10.0
itextsharp.xmlworker version 5.5.10.0
var tagFactory = Tags.GetHtmlTagProcessorFactory();
tagFactory.AddProcessor(new TableTagProcessor(doc), new string[]{"table"});
public class TableTagProcessor : iTextSharp.tool.xml.html.table.Table{
public override IList<IElement> Start(IWorkerContext ctx, Tag tag)
{
var result = base.Start(ctx, tag);
foreach (PdfPTable table in result.OfType<PdfPTable>())
{
table.Complete = false;
}
return result;
}
public override IList<IElement> End(IWorkerContext ctx, Tag tag, IList<IElement> currentContent)
{
var result = base.End(ctx, tag, currentContent);
foreach (PdfPTable table in result.OfType<PdfPTable>())
{
table.Complete = true;
}
return result;
}}

How to Page Break HTML Content in HTML Renderer

I have a project where HTML code is converted to a PDF using HTML Renderer. The HTML code contains a single table. The PDF is displayed but the issue is that the contents of the table are cut off at the end. So is there any solution to the problem?
PdfDocument pdf=new PdfDocument();
var config = new PdfGenerateConfig()
{
MarginBottom = 20,
MarginLeft = 20,
MarginRight = 20,
MarginTop = 20,
};
//config.PageOrientation = PageOrientation.Landscape;
config.ManualPageSize = new PdfSharp.Drawing.XSize(1080, 828);
pdf = PdfGenerator.GeneratePdf(html, config);
byte[] fileContents = null;
using (MemoryStream stream = new MemoryStream())
{
pdf.Save(stream, true);
fileContents = stream.ToArray();
return new FileStreamResult(new MemoryStream(fileContents.ToArray()), "application/pdf");
}

HTMLRenderer should be able break the table to the next page.
See also:
https://github.com/ArthurHub/HTML-Renderer/pull/41
Make sure you are using the latest version. You may have to add those CSS properties.
Also see this answer:
https://stackoverflow.com/a/37833107/162529

As far as I know page breaks are not supported, but I've done a bit of a work-around (which may not work for all cases) by splitting the HTML into separate pages using a page break class, then adding each page to the pdf.
See example code below:
//This will only work on page break elements that are direct children of the body element.
//Each page's content must be inside the pagebreak element
private static PdfDocument SplitHtmlIntoPagedPdf(string html, string pageBreakBeforeClass, PdfGenerateConfig config, PdfDocument pdf)
{
var htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(html);
var htmlBodyNode = htmlDoc.DocumentNode.SelectSingleNode("//body");
var tempHtml = string.Empty;
foreach (var bodyNode in htmlBodyNode.ChildNodes)
{
if (bodyNode.Attributes["class"]?.Value == pageBreakBeforeClass)
{
if (!string.IsNullOrWhiteSpace(tempHtml))
{
//add any content found before the page break
AddPageToPdf(htmlDoc,tempHtml,config,ref pdf);
tempHtml = string.Empty;
}
AddPageToPdf(htmlDoc,bodyNode.OuterHtml,config,ref pdf);
}
else
{
tempHtml += bodyNode.OuterHtml;
}
}
if (!string.IsNullOrWhiteSpace(tempHtml))
{
//add any content found after the last page break
AddPageToPdf(htmlDoc, tempHtml, config, ref pdf);
}
return pdf;
}
private static void AddPageToPdf(HtmlDocument htmlDoc, string html, PdfGenerateConfig config, ref PdfDocument pdf)
{
var tempDoc = new HtmlDocument();
tempDoc.LoadHtml(htmlDoc.DocumentNode.OuterHtml);
var docNode = tempDoc.DocumentNode;
docNode.SelectSingleNode("//body").InnerHtml = html;
var nodeDoc = PdfGenerator.GeneratePdf(docNode.OuterHtml, config);
using (var tempMemoryStream = new MemoryStream())
{
nodeDoc.Save(tempMemoryStream, false);
var openedDoc = PdfReader.Open(tempMemoryStream, PdfDocumentOpenMode.Import);
foreach (PdfPage page in openedDoc.Pages)
{
pdf.AddPage(page);
}
}
}
Then call the code as follows:
var pdf = new PdfDocument();
var config = new PdfGenerateConfig()
{
MarginLeft = 5,
MarginRight = 5,
PageOrientation = PageOrientation.Portrait,
PageSize = PageSize.A4
};
if (!string.IsNullOrWhiteSpace(pageBreakBeforeClass))
{
pdf = SplitHtmlIntoPagedPdf(html, pageBreakBeforeClass, config, pdf);
}
else
{
pdf = PdfGenerator.GeneratePdf(html, config);
}
For any html that you want to have in its own page, just put the html inside a div with a class of "pagebreak" (or whatever you want to call it). If you want to, you could add that class to your css and give it "page-break-before: always;", so that the html will be print-friendly.

I've just figured out how to make it work, rather than page-break-inside on a TD, do that on the TABLE. Here's the code:
table { page-break-inside: avoid; }
I'm currently on the following versions (not working on stable versions at the moment):
HtmlRenderer on v1.5.1-beta1
PDFsharp on v1.51.5185-beta

PDFsharp does not see pages in documents

I made some file merging using PDFsharp before, and now I'm trying to change several files (insert or remove some pages) and I faced with problem, that the library does not see pages. It says that PageCount == 0 and I cannot find pages in object (while debugging). And sure, I cannot do my current work. I use this very simple code:
var destinationPdf = new PdfDocument(destinationFilePath);
Int32 count = destinationPdf.PageCount;
And also, here is the code, that I used to merge files to one PDF before:
public class PdfCreator
{
private PdfDocument document;
public PdfCreator()
{
this.document = new PdfDocument();
}
public void AddImage(String imageFilePath)
{
PdfPage newPage = this.document.AddPage();
XGraphics xGraphics = XGraphics.FromPdfPage(newPage);
XImage image = XImage.FromFile(imageFilePath);
xGraphics.DrawImage(image, 0, 0);
}
public void AddPdfFile(String pdfFilePath)
{
PdfDocument inputDocument = PdfReader.Open(pdfFilePath, PdfDocumentOpenMode.Import);
Int32 count = inputDocument.PageCount;
for (Int32 currentPage = 0; currentPage < count; currentPage++)
{
PdfPage page = inputDocument.Pages[currentPage];
this.document.AddPage(page);
}
}
public void AddTextFile(String txtFilePath)
{
PdfPage newPage = this.document.AddPage();
XGraphics xGraphics = XGraphics.FromPdfPage(newPage);
var xFont = new XFont("Times New Roman", 12, XFontStyle.Bold);
var xTextFormatter = new XTextFormatter(xGraphics);
var rect = new XRect(30, 30, 540, 740);
xGraphics.DrawRectangle(XBrushes.Transparent, rect);
xTextFormatter.Alignment = XParagraphAlignment.Left;
xTextFormatter.DrawString(File.ReadAllText(txtFilePath), xFont, XBrushes.Black, rect, XStringFormats.TopLeft);
}
public void Save(String destinationFilePath)
{
if (this.document.Pages.Count > 0)
{
this.document.Save(destinationFilePath);
this.document.Close();
}
}
}

Your code
var destinationPdf = new PdfDocument(destinationFilePath);
Int32 count = destinationPdf.PageCount;
creates a new document in memory - and surely this document is empty.
Use PdfReader.Open to create a document in memory from an existing file.
When I place the mouse cursor over PdfDocument in your code I get this tooltip:
Creates a new PDF document with the specified file name. The file is
immediately created and keeps locked until the document is closed, at
that time the document is saved automatically. Do not call Save() for
documents created with this constructor, just call Close(). To open an
existing PDF file and import it, use the PdfReader class.