Develop Reference

Extract image from pdf in specific position

I have inserted the image in the pdf using itextsharp as shown below and I tried all the possible solutions to extract it with using the coordinates.
String pathin = pdf.src;
String pathout = "C:\\....";
string signedFile = System.IO.Path.GetTempFileName();
PdfReader reader = new PdfReader(pathin);
FileStream fs = new FileStream(pathout, FileMode.Create);
PdfStamper stamper = new PdfStamper(reader, fs);
PdfContentByte cb = stamper.GetOverContent(1);
iTextSharp.text.Image image1 = iTextSharp.text.Image.GetInstance(imageFileName);
image1.RotationDegrees = 270f;
image1.Alignment = Element.ALIGN_TOP;
image1.SetAbsolutePosition(0,0);
image1.ScalePercent(50f, 50f);
cb.AddImage(image1);
stamper.Close();
fs.Close();
Console.Read();
pdf.src = pathout;
Is there any way to use itextsharp to extract image from position (0,0)?

pseudo-code:
implement IEventListener
parse the page you are interested in, CanvasProcessor takes an IEventListener implementation in its constructor, every time it finishes rendering text, an image, or a path, it will notify the IEventListener
IEventListener has a method called eventOccurred(IEventData data, EventType type). One of the types will be responsible for images
cast IEventData to ImageRenderInfo
derive the coordinates from the ImageRenderInfo object
if the coordinates happen to contain Point(0, 0) then (temporarily) store the image in a variable of your IEventListener
code sample (java, iText7)
disclaimer: the following code does not handle rotation
class MyImageSeek implements IEventListener{
private int pageNr = 0;
private Map<Integer, Map<Rectangle, BufferedImage>> images = new HashMap<>();
public MyImageSeek(PdfDocument pdfDocument){
PdfCanvasProcessor canvasProcessor = new PdfCanvasProcessor(this);
for(int i=1;i<=pdfDocument.getNumberOfPages();i++) {
images.put(i, new HashMap<Rectangle, BufferedImage>());
pageNr = i;
canvasProcessor.processPageContent(pdfDocument.getPage(i));
}
}
#Override
public void eventOccurred(IEventData data, EventType type) {
if(type != EventType.RENDER_IMAGE)
return;
ImageRenderInfo imageRenderInfo = (ImageRenderInfo) data;
int x = (int) imageRenderInfo.getStartPoint().get(0);
int y = (int) imageRenderInfo.getStartPoint().get(1);
int w = (int) imageRenderInfo.getImageCtm().get(Matrix.I11);
int h = (int) imageRenderInfo.getImageCtm().get(Matrix.I22);
try {
images.get(pageNr).put(new Rectangle(x,y,w,h), imageRenderInfo.getImage().getBufferedImage());
} catch (IOException e) {}
}
#Override
public Set<EventType> getSupportedEvents() {
return null;
}
public Map<Rectangle, BufferedImage> getImages(int pageNr){
return images.get(pageNr);
}
}
and this is the main method to call this class
PdfDocument pdfDocument = new PdfDocument(new PdfReader(new File("C:\\Users\\me\\lookAtMe.pdf")));
MyImageSeek meeseek = new MyImageSeek(pdfDocument);
for(Map.Entry<Rectangle, BufferedImage> en : meeseek.getImages(1).entrySet())
System.out.println(en.getKey() + "\t" + en.getValue());

Render a barcode in ASP.NET Web Form

i am trying to show the barcode in asp.net page. already download the zen barcode render with sample code. i tried the sample it is working fine with me. once i try in my code barcode label is showing empty. i checked with sample code and mine i did not find any difference , only data transfer is the different. this is what i tried.
<barcode:BarcodeLabel ID="BarcodeLabel1" runat="server" BarcodeEncoding="Code39NC" LabelVerticalAlign="Bottom" Text="12345"></barcode:BarcodeLabel>
if (!IsPostBack)
{
List<string> symbologyDataSource = new List<string>(
Enum.GetNames(typeof(BarcodeSymbology)));
symbologyDataSource.Remove("Unknown");
barcodeSymbology.DataSource = symbologyDataSource;
barcodeSymbology.DataBind();
}
this is the function
BarcodeSymbology symbology = BarcodeSymbology.Unknown;
if (barcodeSymbology.SelectedIndex != 0)
{
symbology = (BarcodeSymbology)1;
}
symbology = (BarcodeSymbology)1;
string text = hidID.Value.ToString();
string scaleText = "1";
int scale;
if (!int.TryParse(scaleText, out scale))
{
if (symbology == BarcodeSymbology.CodeQr)
{
scale = 3;
}
else
{
scale = 1;
}
}
else if (scale < 1)
{
scale = 1;
}
if (!string.IsNullOrEmpty(text) && symbology != BarcodeSymbology.Unknown)
{
barcodeRender.BarcodeEncoding = symbology;
barcodeRender.Scale = 1;
barcodeRender.Text = text;
}
symbology is set as Code39NC from the dropdown. scale is 1 and text is coming from other form the value is passing as well. still the bacodelable is showing only value not the barcode picture.

Here are two code samples using ZXing to create a (QR) barcode as both an image and as a base64 encoded string. Both of these options can be used with an <img /> tag to embed the barcode in the page.
This is not an ASP.NET control. It is a library that creates barcodes from text.
// First Text to QR Code as an image
public byte[] ToQRAsGif(string content)
{
var barcodeWriter = new BarcodeWriter
{
Format = BarcodeFormat.QR_CODE,
Options = new EncodingOptions
{
Height = this._h,
Width = this._w,
Margin = 2
}
};
using (var bitmap = barcodeWriter.Write(content))
using (var stream = new MemoryStream())
{
bitmap.Save(stream, ImageFormat.Gif);
stream.Position = 0;
return stream.GetBuffer();
}
}
// From Text to QR Code as base64 string
public string ToQRAsBase64String(string content)
{
var barcodeWriter = new BarcodeWriter
{
Format = BarcodeFormat.QR_CODE,
Options = new EncodingOptions
{
Height = _h,
Width = _w,
Margin = 2
}
};
using (var bitmap = barcodeWriter.Write(content))
using (var stream = new MemoryStream())
{
bitmap.Save(stream, ImageFormat.Gif);
return String.Format("data:image/gif;base64,{0}", Convert.ToBase64String(stream.ToArray()));
}
}
Hope this helps! Happy coding.
UPDATE: Here is the link to their product page on codeplex: https://zxingnet.codeplex.com/

iTextSharp PDF header with HTML string C#

I'm trying to generate PDF reports using iTextSharp with customer information, header and footer etc. All these reports are already generated using EVO APIs. As part of a migration process, we are planning to generate these reports using iTextSharp APIs.
I need to know if there is any possibility to provide a ready to render HTML string to iTextSharp PDF header (Existing EVO design accepts HTML string and build PDF), instead of using PageEvents to design with PDFPTable and PDFPCell (as the number of reports are huge and to avoid rework)

I need to know if there is any possibility to provide a ready to render HTML string to iTextSharp PDF header (Existing EVO design accepts HTML string and build PDF), instead of using PageEvents to design with PDFPTable and PDFPCell
You will have to use page events to draw header or footers but there is no need to use PdfPTable explicitly there. You actually can render html during a page event, e.g. like this:
[Test]
public void CreatePdfWithHtmlHeader()
{
string htmlHeader = "<!DOCTYPE html><html><body><table style=\"width: 100%; border: 1px solid black;\"><tr><td>A</td><td>B</td></tr></table></body></html>";
using (FileStream output = new FileStream(#"C:\Temp\test-results\content\html-header.pdf", FileMode.Create, FileAccess.Write))
using (Document document = new Document(PageSize.A4))
{
PdfWriter writer = PdfWriter.GetInstance(document, output);
writer.PageEvent = new HtmlPageEventHelper(htmlHeader);
document.Open();
document.Add(new Paragraph("1"));
document.NewPage();
document.Add(new Paragraph("2"));
}
}
making use the following two small helper classes.
HtmlPageEventHelper is a page event listener drawing a given html sniplet into the page header. Obviously it can alternatively or additionally write into the page footer, simply use appropriate column coordinates
public class HtmlPageEventHelper : PdfPageEventHelper
{
public HtmlPageEventHelper(string html)
{
this.html = html;
}
public override void OnEndPage(PdfWriter writer, Document document)
{
base.OnEndPage(writer, document);
ColumnText ct = new ColumnText(writer.DirectContent);
XMLWorkerHelper.GetInstance().ParseXHtml(new ColumnTextElementHandler(ct), new StringReader(html));
ct.SetSimpleColumn(document.Left, document.Top, document.Right, document.GetTop(-20), 10, Element.ALIGN_MIDDLE);
ct.Go();
}
string html = null;
}
For more complex HTML sniplets you may want to replace the XMLWorkerHelper.GetInstance().ParseXHtml call by a customized parser call as presented in #Skary's answer.
ColumnTextElementHandler is an IElementHandler implementation that adds content (generated e.g. by parsing HTML) to a ColumnText
public class ColumnTextElementHandler : IElementHandler
{
public ColumnTextElementHandler(ColumnText ct)
{
this.ct = ct;
}
ColumnText ct = null;
public void Add(IWritable w)
{
if (w is WritableElement)
{
foreach (IElement e in ((WritableElement)w).Elements())
{
ct.AddElement(e);
}
}
}
}
By the way, the test above produces a PDF with this content:
...
...
Disclaimer: I predominantly work with Java and have not used the XmlWorker before. Thus, this code may have considerable potential for improvement.

I am not sure to have understand you question right.
If you are asking how to parse HTML to PDF using iTextSharp here is the solutin i found time ago :
using (Document document = new Document(size))
{
var writer = PdfWriter.GetInstance(document, stream);
document.Open();
document.NewPage();
document.Add(new Chunk(""));
var tagProcessors = (DefaultTagProcessorFactory)Tags.GetHtmlTagProcessorFactory();
tagProcessors.RemoveProcessor(HTML.Tag.IMG);
tagProcessors.AddProcessor(HTML.Tag.IMG, new CustomImageTagProcessor());
var charset = Encoding.UTF8;
CssFilesImpl cssFiles = new CssFilesImpl();
cssFiles.Add(XMLWorkerHelper.GetInstance().GetDefaultCSS());
var cssResolver = new StyleAttrCSSResolver(cssFiles);
cssResolver.AddCss(srcCssData, "utf-8", true);
var hpc = new HtmlPipelineContext(new CssAppliersImpl(new XMLWorkerFontProvider()));
hpc.SetAcceptUnknown(true).AutoBookmark(true).SetTagFactory(tagProcessors);
var htmlPipeline = new HtmlPipeline(hpc, new PdfWriterPipeline(document, writer));
var pipeline = new CssResolverPipeline(cssResolver, htmlPipeline);
var worker = new XMLWorker(pipeline, true);
var xmlParser = new XMLParser(true, worker, charset);
xmlParser.Parse(new StringReader(srcFileData));
document.Close();
}
To get it work you need to add custom image processor to inline image in the HTML you provide to tha above converte function :
public class CustomImageTagProcessor : iTextSharp.tool.xml.html.Image
{
public override IList<IElement> End(IWorkerContext ctx, Tag tag, IList<IElement> currentContent)
{
IDictionary<string, string> attributes = tag.Attributes;
string src;
if (!attributes.TryGetValue(HTML.Attribute.SRC, out src))
return new List<IElement>(1);
if (string.IsNullOrEmpty(src))
return new List<IElement>(1);
if (src.StartsWith("data:image/", StringComparison.InvariantCultureIgnoreCase))
{
// data:[<MIME-type>][;charset=<encoding>][;base64],<data>
var base64Data = src.Substring(src.IndexOf(",") + 1);
var imagedata = Convert.FromBase64String(base64Data);
var image = iTextSharp.text.Image.GetInstance(imagedata);
var list = new List<IElement>();
var htmlPipelineContext = GetHtmlPipelineContext(ctx);
list.Add(GetCssAppliers().Apply(new Chunk((iTextSharp.text.Image)GetCssAppliers().Apply(image, tag, htmlPipelineContext), 0, 0, true), tag, htmlPipelineContext));
return list;
}
else
{
return base.End(ctx, tag, currentContent);
}
}
}

iTextSharp: table in landscape

I'm using iTextSharp to generate a large document. In this document I want some specific pages in landscape. All the rest is portrait. Does anyone know how I can do this?
Starting a new document is not an option.
Thanks!

You can set the document size and it will affect the next pages. Some snippets:
Set up your document somewhere (you know that already):
var document = new Document();
PdfWriter pdfWriter = PdfWriter.GetInstance(
document, new FileStream(destinationFile, FileMode.Create)
);
pdfWriter.SetFullCompression();
pdfWriter.StrictImageSequence = true;
pdfWriter.SetLinearPageMode();
Now loop over your pages (you probably do that as well already) and decide what page size you want per page:
for (int pageIndex = 1; pageIndex <= pageCount; pageIndex++) {
// Define the page size here, _before_ you start the page.
// You can easily switch from landscape to portrait to whatever
document.SetPageSize(new Rectangle(600, 800));
if (document.IsOpen()) {
document.NewPage();
} else {
document.Open();
}
}

try this code :
using System;
using System.IO;
using iText.Kernel.Events;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
namespace iText.Samples.Sandbox.Events
{
public class PageOrientations
{
public static readonly String DEST = "results/sandbox/events/page_orientations.pdf";
public static readonly PdfNumber PORTRAIT = new PdfNumber(0);
public static readonly PdfNumber LANDSCAPE = new PdfNumber(90);
public static readonly PdfNumber INVERTEDPORTRAIT = new PdfNumber(180);
public static readonly PdfNumber SEASCAPE = new PdfNumber(270);
public static void Main(String[] args)
{
FileInfo file = new FileInfo(DEST);
file.Directory.Create();
new PageOrientations().ManipulatePdf(DEST);
}
protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
// The default page orientation is set to portrait in the custom event handler.
PageOrientationsEventHandler eventHandler = new PageOrientationsEventHandler();
pdfDoc.AddEventHandler(PdfDocumentEvent.START_PAGE, eventHandler);
Document doc = new Document(pdfDoc);
doc.Add(new Paragraph("A simple page in portrait orientation"));
eventHandler.SetOrientation(LANDSCAPE);
doc.Add(new AreaBreak());
doc.Add(new Paragraph("A simple page in landscape orientation"));
eventHandler.SetOrientation(INVERTEDPORTRAIT);
doc.Add(new AreaBreak());
doc.Add(new Paragraph("A simple page in inverted portrait orientation"));
eventHandler.SetOrientation(SEASCAPE);
doc.Add(new AreaBreak());
doc.Add(new Paragraph("A simple page in seascape orientation"));
doc.Close();
}
private class PageOrientationsEventHandler : IEventHandler
{
private PdfNumber orientation = PORTRAIT;
public void SetOrientation(PdfNumber orientation)
{
this.orientation = orientation;
}
public void HandleEvent(Event currentEvent)
{
PdfDocumentEvent docEvent = (PdfDocumentEvent) currentEvent;
docEvent.GetPage().Put(PdfName.Rotate, orientation);
}
}
}
}

How to Print Preview when using a DocumentPaginator to print?

I'm using a class I've derived from DocumentPaginator (see below) to print simple (text only) reports from a WPF application. I've got it so that everything prints correctly, But how do I get it to do a print preview before printing? I have a feeling I need to use a DocumentViewer but I can't figure out how.
Here's my Paginator Class:
public class RowPaginator : DocumentPaginator
{
private int rows;
private Size pageSize;
private int rowsPerPage;
public RowPaginator(int rows)
{
this.rows = rows;
}
public override DocumentPage GetPage(int pageNumber)
{
int currentRow = rowsPerPage * pageNumber;
int rowsToPrint = Math.Min(rowsPerPage, rows - (rowsPerPage * pageNumber - 1));
var page = new PageElementRenderer(pageNumber + 1, PageCount, currentRow, rowsToPrint)
{
Width = PageSize.Width,
Height = PageSize.Height
};
page.Measure(PageSize);
page.Arrange(new Rect(new Point(0, 0), PageSize));
return new DocumentPage(page);
}
public override bool IsPageCountValid { get { return true; } }
public override int PageCount { get { return (int)Math.Ceiling(this.rows / (double)this.rowsPerPage); } }
public override Size PageSize
{
get { return this.pageSize; }
set
{
this.pageSize = value;
this.rowsPerPage = PageElementRenderer.RowsPerPage(this.pageSize.Height);
if (rowsPerPage <= 0)
throw new InvalidOperationException("Page can't fit any rows!");
}
}
public override IDocumentPaginatorSource Source { get { return null; } }
}
The PageElementRenderer is just a simple UserControl that displays the data (at the moment just a list of rows).
Here's how I use my Row Paginator
PrintDialog dialog = new PrintDialog();
if (dialog.ShowDialog() == true)
{
var paginator = new RowPaginator(rowsToPrint) { PageSize = new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight) };
dialog.PrintDocument(paginator, "Rows Document");
}
Sorry for the code dump, but I didn't want to miss something relevant.

So I got it working after reading Pro WPF in C# 2008 (Page 726).
Basically the DocumentViewer class needs an XPS file to present a print preview of it. So I do the following:
PrintDialog dialog = new PrintDialog();
var paginator = new RowPaginator(rowsToPrint) { PageSize = new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight) };
string tempFileName = System.IO.Path.GetTempFileName();
//GetTempFileName creates a file, the XpsDocument throws an exception if the file already
//exists, so delete it. Possible race condition if someone else calls GetTempFileName
File.Delete(tempFileName);
using (XpsDocument xpsDocument = new XpsDocument(tempFileName, FileAccess.ReadWrite))
{
XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(xpsDocument);
writer.Write(paginator);
PrintPreview previewWindow = new PrintPreview
{
Owner = this,
Document = xpsDocument.GetFixedDocumentSequence()
};
previewWindow.ShowDialog();
}
I'm creating the print dialog to get the default page size. There's probably a better way to do this.
XpsDocument is in ReachFramework.dll (Namespace System.Windows.Xps.Packaging);
Here's the PrintPreview Window.
<Window x:Class="WPFPrintTest.PrintPreview"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Name="previewWindow"
Title="PrintPreview" Height="800" Width="800">
<Grid>
<DocumentViewer Name="viewer"
Document="{Binding ElementName=previewWindow, Path=Document}" />
</Grid>
</Window>
The code behind just has a Document property like so:
public IDocumentPaginatorSource Document
{
get { return viewer.Document; }
set { viewer.Document = value; }
}

The following code uses a MemoryStream to do a print preview.
MemoryStream stream = new MemoryStream();
Package package = Package.Open(stream, FileMode.Create, FileAccess.ReadWrite);
var uri = new Uri(#"memorystream://myXps.xps");
PackageStore.AddPackage(uri, package);
var xpsDoc = new XpsDocument(package);
xpsDoc.Uri = uri;
XpsDocument.CreateXpsDocumentWriter(xpsDoc).Write(paginator);
documentViewer.Document = xpsDoc.GetFixedDocumentSequence();
Remember to use close() and remove package from PackageStore when the print preview is closed.

WPF doesn't come with any built-in Print Preview functionality, if you want to do a print preview, you're going to have to construct it yourself. Fortunately, it's shouldn't be that difficult.
You've already got the pagination code, which creates your DocumentPage objects. These objects contain a Visual, which you can go ahead and display in your UI.
What you'll end up doing, is paginating your entire document, collecting all the DocumentPage objects, then displaying their visuals inside of a scrolling StackPanel or something similar. These are the same DocumentPage objects that you can then send to the printer.

XpsDocument doc = new XpsDocument("filename.xps", FileAccess.Read);
docViewer.Document = doc.GetFixedDocumentSequence();
doc.Close();

The WinForm code for print preview is:
PrintPreviewDialog PrintPreviewDialog = new PrintPreviewDialog();
PrintPreviewDialog.Document = PrintDocument;
PrintPreviewDialog.ShowDialog();
P.s.: The original poster has commented that this is the wrong answer for an WPF application.

I dont think there is a built in way of doing this
Here is how I got it working in NHaml
var documentViewHostDialog = new DocumentDialog();
documentViewHostDialog.LoadDocument(load);
documentViewHostDialog.ShowDialog();
Where "load" is either a FlowDocument or IDocumentPaginatorSource
and here is the DocumentDialog
http://code.google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml
http://code.google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml.cs
Hope it works for your case.