Develop Reference

Updating existing markup (FreeText Callout) PDF using itext7 .NET

I have a code below to update existing markup (FreeText Callout) PDF using itext7 .NET. It does not appear correctly, but edit it in the bluebeam then it is shown the correct content as this image:
What am I missing?
public void UpdateMarkupCallout()
{
string inPDF = #"C:\in PDF.pdf";
string outPDF = #"C:\out PDF.pdf";
PdfDocument pdfDoc = new PdfDocument(new PdfReader(inPDF), new PdfWriter(outPDF));
int numberOfPages = pdfDoc.GetNumberOfPages();
for (int i = 1; i <= numberOfPages; i++)
{
PdfDictionary page = pdfDoc.GetPage(i).GetPdfObject();
PdfArray annotArray = page.GetAsArray(PdfName.Annots);
if (annotArray == null)
{
continue;
}
int size = annotArray.Size();
for (int x = 0; x < size; x++)
{
PdfDictionary curAnnot = annotArray.GetAsDictionary(x);
if (curAnnot.GetAsString(PdfName.Contents) != null)
{
string contents = curAnnot.GetAsString(PdfName.Contents).ToString();
if (contents != "" && contents.Contains("old content"))
{
curAnnot.Put(PdfName.Contents, new PdfString("new content"));
}
}
}
}
pdfDoc.Close();
}
The attached files: here

The answer is in Java but conversion to C# should be a matter of some easy letter case replacements and small tweaks.
Unfortunately, there is no silver bullet solution here, at least not without significant effort.
1. Partial proper solution
There are several issues here. First, you are only updating /Contents key, while the annotations you are editing also have /RC key which stands for A rich text string (see Adobe XML Architecture, XML Forms Architecture (XFA) Specification, version 3.3) that shall be used to generate the appearance of the annotation. (ISO 32000).
On top of that, the appearance (/AP entry) must be regenerated. as dictated by the specification. This is not what iText is capable of doing at the moment, so you will have to do it yourself.
You need to determine the area where the text must be drawn, taking /RD, or rect diff entry into account.
To create your appearance you can use pdfHTML add-on which would process the rich text representation from /RC into layout elements that you can transfer to an XObject that you can put into /AP.
With the code similar to the following:
PdfDocument pdfDocument = new PdfDocument(new PdfReader("in PDF.pdf"),
new PdfWriter("out PDF.pdf"));
int numberOfPages = pdfDocument.getNumberOfPages();
for (int i = 1; i <= numberOfPages; i++) {
PdfDictionary page = pdfDocument.getPage(i).getPdfObject();
PdfArray annotArray = page.getAsArray(PdfName.Annots);
if (annotArray == null) {
continue;
}
int size = annotArray.size();
for (int x = 0; x < size; x++) {
PdfDictionary curAnnot = annotArray.getAsDictionary(x);
if (curAnnot.getAsString(PdfName.Contents) != null) {
String contents = curAnnot.getAsString(PdfName.Contents).toString();
if (!contents.isEmpty() && contents.contains("old content")) //set layer for a FreeText with this content
{
curAnnot.put(PdfName.Contents, new PdfString("new content"));
String richText = curAnnot.getAsString(PdfName.RC).toUnicodeString();
Document document = Jsoup.parse(richText);
for (Element element : document.select("p")) {
element.html("new content");
}
curAnnot.put(PdfName.RC, new PdfString(document.body().outerHtml()));
Rectangle bbox = curAnnot.getAsRectangle(PdfName.Rect);
Rectangle textBbox = bbox.clone();
// left, top, right, bottom
PdfArray rectDiff = curAnnot.getAsArray(PdfName.RD);
if (rectDiff != null) {
textBbox.applyMargins(rectDiff.getAsNumber(1).floatValue(),
rectDiff.getAsNumber(2).floatValue(),
rectDiff.getAsNumber(3).floatValue(),
rectDiff.getAsNumber(0).floatValue(), false);
}
float leftRectDiff = rectDiff != null ? rectDiff.getAsNumber(0).floatValue() : 0;
float topRectDiff = rectDiff != null ? rectDiff.getAsNumber(1).floatValue() : 0;
List<IElement> elements = HtmlConverter.convertToElements(document.body().outerHtml());
PdfFormXObject appearance = new PdfFormXObject(
new Rectangle(0, 0, bbox.getWidth(), bbox.getHeight()));
Canvas canvas = new Canvas(new PdfCanvas(appearance, pdfDocument),
new Rectangle(leftRectDiff, topRectDiff, textBbox.getWidth(), textBbox.getHeight()));
canvas.setProperty(Property.RENDERING_MODE, RenderingMode.HTML_MODE);
for (IElement ele : elements) {
if (ele instanceof IBlockElement) {
canvas.add((IBlockElement) ele);
}
}
curAnnot.getAsDictionary(PdfName.AP).put(PdfName.N, appearance.getPdfObject());
}
}
}
}
pdfDocument.close();
You would get the result that looks like that:
You can see that the new text is displayed as expected, but the overall visual representation is far from our expectations - the background filling, the borders and the arrows are missing. So to generate the appearance properly you would have to further explore other PDF properties such as /CL (arrow descriptors), /BS (border style), /C (background color) etc. This takes quite some time - reading up on the spec, parsing the relevant entries and applying those in your drawing operations. You can get some inspiration from PdfFormField class implementation.
2. Easy solution without any guarantees
In case you expect the text in your annotation to consist of only one line, be plain Latin text and in general the variability of the input documents is small, you can take the current appearance and assume that the text string will be written there in one chunk (it's the case for your input document).
Note that this is a hacky approach which is prone to many potential errors/bugs.
Sample code:
PdfDocument pdfDocument = new PdfDocument(new PdfReader("in PDF.pdf"),
new PdfWriter("out PDF.pdf"));
int numberOfPages = pdfDocument.getNumberOfPages();
for (int i = 1; i <= numberOfPages; i++) {
PdfDictionary page = pdfDocument.getPage(i).getPdfObject();
PdfArray annotArray = page.getAsArray(PdfName.Annots);
if (annotArray == null) {
continue;
}
int size = annotArray.size();
for (int x = 0; x < size; x++) {
PdfDictionary curAnnot = annotArray.getAsDictionary(x);
if (curAnnot.getAsString(PdfName.Contents) != null) {
String contents = curAnnot.getAsString(PdfName.Contents).toString();
String oldContent = "old content";
if (!contents.isEmpty() && contents.contains(oldContent)) {
String newContent = "new content";
curAnnot.put(PdfName.Contents, new PdfString(newContent));
String richText = curAnnot.getAsString(PdfName.RC).toUnicodeString();
Document document = Jsoup.parse(richText);
for (Element element : document.select("p")) {
element.html(newContent);
}
curAnnot.put(PdfName.RC, new PdfString(document.body().outerHtml()));
PdfStream currentAppearance = curAnnot.getAsDictionary(PdfName.AP).getAsStream(PdfName.N);
String currentBytes = new String(currentAppearance.getBytes(), StandardCharsets.UTF_8);
currentBytes = currentBytes.replace("(" + oldContent + ") Tj", "(" + newContent + ") Tj");
currentAppearance.setData(currentBytes.getBytes(StandardCharsets.UTF_8));
}
}
}
}
pdfDocument.close();
Visual result (as you can see, this is what we want):
3. Non-compliant solution
Another way, which is not compliant with the PDF specification, is to remove /AP entry whatsoever. You can do it in the very same loop with curAnnot.remove(PdfName.AP);. Most major PDF viewers are going to regenerate the appearance themselves. However, my viewer generated the appearance in not the most appealing way:
So as you can see the result will depend on the PDF-viewer and this very well illustrates the reason why PDF specification mandates presence of /AP. Once again, this way is not compliant with the PDF spec .

Split PDF by chapters from Table Of Contents

I'm using GemBox.Pdf and I need to extract individual chapters in a PDF file as a separate PDF files.
The first page (maybe the second page as well) contains TOC (Table Of Contents) and I need to split the rest of the PDF pages based on it:
Also, those PDF documents that are split, should be named as the chapters they contains.
I can split the PDF based on the number of pages for each document (I figured that out using this example):
using (var source = PdfDocument.Load("Chapters.pdf"))
{
int pagesPerSplit = 3;
int count = source.Pages.Count;
for (int index = 1; index < count; index += pagesPerSplit)
{
using (var destination = new PdfDocument())
{
for (int splitIndex = 0; splitIndex < pagesPerSplit; splitIndex++)
destination.Pages.AddClone(source.Pages[index + splitIndex]);
destination.Save("Chapter " + index + ".pdf");
}
}
}
But I can't figure out how to read and process that TOC and incorporate the chapters splitting base on its items.

You should iterate through the document's bookmarks (outlines) and split it based on the bookmark destination pages.
For instance, try this:
using (var source = PdfDocument.Load("Chapters.pdf"))
{
PdfOutlineCollection outlines = source.Outlines;
PdfPages pages = source.Pages;
Dictionary<PdfPage, int> pageIndexes = pages
.Select((page, index) => new { page, index })
.ToDictionary(item => item.page, item => item.index);
for (int index = 0, count = outlines.Count; index < count; ++index)
{
PdfOutline outline = outlines[index];
PdfOutline nextOutline = index + 1 < count ? outlines[index + 1] : null;
int pageStartIndex = pageIndexes[outline.Destination.Page];
int pageEndIndex = nextOutline != null ?
pageIndexes[nextOutline.Destination.Page] :
pages.Count;
using (var destination = new PdfDocument())
{
while (pageStartIndex < pageEndIndex)
{
destination.Pages.AddClone(pages[pageStartIndex]);
++pageStartIndex;
}
destination.Save($"{outline.Title}.pdf");
}
}
}
Note, from the screenshot it seems that your chapter bookmarks include the order's number (roman numerals). If needed, you can easily remove those with something like this:
destination.Save($"{outline.Title.Substring(outline.Title.IndexOf(' ') + 1)}.pdf");

Adding a group of annotations from one pdf in all pages of another pdf and create a new output pdf

I have created a reader for Input file and one for the Markup file. I am not sure if I should loop through the annotations and then add them one by one to the output or if there is a way to pull all the annotations from the markup file and add them to the input file retaining their x,z coordinates.
I have the below code, and I am not sure what to do at the commented section. The AddAnnotation method only takes PdfAnnotation as input but I am not sure how to convert the PdfDictionary to PdfAnnotaiton.
class Program
{
public static string inputFile = #"E:\pdf-sample.pdf";
public static string markupFile = #"E:\StampPdf.pdf";
public static string outputFile = #"E:\pdf.pdf";
public static PdfReader inputReader = new PdfReader(inputFile);
public static PdfReader markupReader = new PdfReader(markupFile);
static void Main(string[] args)
{
PdfDocument inputDoc = new PdfDocument(inputReader, new PdfWriter(outputFile));
PdfDocument markupDoc = new PdfDocument(markupReader);
int n = inputDoc.GetNumberOfPages();
for (int i = 1; i <= n; i++)
{
PdfPage page = inputDoc.GetPage(i);
PdfDictionary markupPage = markupDoc.GetFirstPage().GetPdfObject();
PdfArray annots = markupPage.GetAsArray(PdfName.Annots);
if(annots != null)
{
for(int j=0; j < annots.Size(); j++)
{
PdfDictionary annotItem = annots.GetAsDictionary(i);
//******
//page.AddAnnotation(?);
//******
}
}
}
inputDoc.Close();
}
}
I tried another variation after I found new GetAnnotations method in iText7. Here the code runs fine but I am not able to open the O/P file and get an error that the file is corrupted. Also when I ran inputDoc.Close() instead of the last line given below, I got an error “Pdf indirect object belongs to other PDF document. Copy object to current pdf document.”
PdfReader ireader = new PdfReader(inputFile);
PdfDocument inputDoc = new PdfDocument(ireader, new PdfWriter(outputFile));
PdfReader mreader = new PdfReader(markupFile);
PdfDocument markupDoc = new PdfDocument(mreader);
var annots = markupDoc.GetFirstPage().GetAnnotations();
if (annots != null)
{
for (int j = 0; j < annots.Count(); j++)
{
inputDoc.GetFirstPage().AddAnnotation(annots[j]);
}
}
ireader.Close();
mreader.Close();
markupDoc.Close();
inputDoc.SetCloseWriter(true);

Maybe try this :
if (annots != null)
{
for (int j = 0; j < annots.Size(); j++)
{
PdfDictionary annotItem = annots.GetAsDictionary(i);
PdfLineAnnotation lineAnnotation = new PdfLineAnnotation(annotItem);
page.AddAnnotation(lineAnnotation);
}
}
If it doesn't work, here is some documentation (unfortunately in Java)
http://developers.itextpdf.com/examples/actions-and-annotations/clone-creating-and-adding-annotations
If you could post Pdf with annotations you wish to copy - maybe I can debug and try something more.

How to continue data writing on a new pdf page if it exceeds the page size in iTextShartp pdf

I have gone through this site but could not find the relative solution to my problem.
Here is my problem
I am creating a PDF file using iTextSharp and the file is being created very well. I am creating a table and assigning it a gridview data as follows.
//Add Actual columns from the datatable
for (int j = 0; j < dt.Columns.Count; j++) {
PdfPCell cellHeader = new PdfPCell(FormatHeaderPhrase(dt.Columns[j].ColumnName.ToString()));
cellHeader.HorizontalAlignment = 1;
table3.AddCell(cellHeader);// adds the header with proeprties
}
//Add the actual rows from the datatable
for (int i = 0; i < dt.Rows.Count; i++) {
for (int k = 0; k < dt.Columns.Count; k++) {
PdfPCell cellRows = new PdfPCell(FormatPhrase(dt.Rows[i][k].ToString().Replace("<br/>","\n").Replace("<sup>","")));
if (k != 2) {
cellRows.HorizontalAlignment = 1;
cellRows.VerticalAlignment = Element.ALIGN_MIDDLE;
}
else {
cellRows.HorizontalAlignment = 0;
}
table3.AddCell(cellRows);
table3.SplitRows = true;
table3.SplitLate = true;
}
}
I have a A3 page size. The concern here is, when my data in the table exceeds the page size, it trims the exceeded part and just shows the data which fits in one page. How to make it multipage(auto page break) based on the content of the table. Currently I am seeing the data which fits into one page of pdf. It should have generated more than one pages. How can I achieve this.
Please let me know your inputs. I would appreciate them. Thank you.

This may work, try creating new page after every n rows, suppose if current page fits only
10 rows, creating new page after every 10th record
Suppose you created a initial document instance
Document document =new Document(PageSize.A4);
After n rows, add new page by calling
document.NewPage();

Convert Pdf file pages to Images with itextsharp

I want to convert Pdf pages in Images using ItextSharp lib.
Have any idea how to convert each page in image file

iText/iTextSharp can generate and/or modify existing PDFs but they do not perform any rendering which is what you are looking for. I would recommend checking out Ghostscript or some other library that knows how to actually render a PDF.

you can use ImageMagick convert pdf to image
convert -density 300 "d:\1.pdf" -scale #1500000 "d:\a.jpg"
and split pdf can use itextsharp
here is the code from others.
void SplitePDF(string filepath)
{
iTextSharp.text.pdf.PdfReader reader = null;
int currentPage = 1;
int pageCount = 0;
//string filepath_New = filepath + "\\PDFDestination\\";
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
//byte[] arrayofPassword = encoding.GetBytes(ExistingFilePassword);
reader = new iTextSharp.text.pdf.PdfReader(filepath);
reader.RemoveUnusedObjects();
pageCount = reader.NumberOfPages;
string ext = System.IO.Path.GetExtension(filepath);
for (int i = 1; i <= pageCount; i++)
{
iTextSharp.text.pdf.PdfReader reader1 = new iTextSharp.text.pdf.PdfReader(filepath);
string outfile = filepath.Replace((System.IO.Path.GetFileName(filepath)), (System.IO.Path.GetFileName(filepath).Replace(".pdf", "") + "_" + i.ToString()) + ext);
reader1.RemoveUnusedObjects();
iTextSharp.text.Document doc = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(currentPage));
iTextSharp.text.pdf.PdfCopy pdfCpy = new iTextSharp.text.pdf.PdfCopy(doc, new System.IO.FileStream(outfile, System.IO.FileMode.Create));
doc.Open();
for (int j = 1; j <= 1; j++)
{
iTextSharp.text.pdf.PdfImportedPage page = pdfCpy.GetImportedPage(reader1, currentPage);
pdfCpy.SetFullCompression();
pdfCpy.AddPage(page);
currentPage += 1;
}
doc.Close();
pdfCpy.Close();
reader1.Close();
reader.Close();
}
}

You can use Ghostscript
to convert the PDF files into Images, I used the following parameters to convert the needed PDF into tiff image with multiple frames :
gswin32c.exe -sDEVICE=tiff12nc -dBATCH -r200 -dNOPAUSE -sOutputFile=[Output].tiff [PDF FileName]
Also you can use the -q parameter for silent mode
You can get more information about its output devices from here
After that I can easily load the tiff frames like the following
using (FileStream stream = new FileStream(#"C:\tEMP\image_$i.tiff", FileMode.Open, FileAccess.Read, FileShare.Read))
{
BitmapDecoder dec = BitmapDecoder.Create(stream, BitmapCreateOptions.IgnoreImageCache, BitmapCacheOption.None);
BitmapEncoder enc = BitmapEncoder.Create(dec.CodecInfo.ContainerFormat);
enc.Frames.Add(dec.Frames[frameIndex]);
}

I did it with MuPDFCore NuGet. Here is the link to guide I used : https://giorgiobianchini.com/MuPDFCore/MuPDFCore.pdf
using System;
using System.Threading.Tasks;
using MuPDFCore;
using VectSharp.Raster;
MuPDFContext context = new MuPDFContext();
MuPDFDocument document = new MuPDFDocument(context, #"C:\install\test.pdf");
//Renderers: one per page
MuPDFMultiThreadedPageRenderer[] renderers = new MuPDFMultiThreadedPageRenderer[document.Pages.Count];
//Page size: one per page
RoundedSize[] renderedPageSizes = new RoundedSize[document.Pages.Count];
//Boundaries of the tiles that make up each page: one array per page, with one element per thread
RoundedRectangle[][] tileBounds = new RoundedRectangle[document.Pages.Count][];
//Addresses of the memory areas where the image data of the tiles will be stored: one array per page, with one element per thread
IntPtr[][] destinations = new IntPtr[document.Pages.Count][];
//Cycle through the pages in the document to initialise everything
for (int i = 0; i < document.Pages.Count; i++)
{
//Initialise the renderer for the current page, using two threads (total number of threads: number of pages x 2
renderers[i] = document.GetMultiThreadedRenderer(i, 2);
//Determine the boundaries of the page when it is rendered with a 1.5x zoom factor
RoundedRectangle roundedBounds = document.Pages[i].Bounds.Round(2);//quality ..can use 0.5 ,1 etc.
renderedPageSizes[i] = new RoundedSize(roundedBounds.Width, roundedBounds.Height);
//Determine the boundaries of each tile by splitting the total size of the page by the number of threads.
tileBounds[i] = renderedPageSizes[i].Split(renderers[i].ThreadCount);
destinations[i] = new IntPtr[renderers[i].ThreadCount];
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
//Allocate the required memory for the j-th tile of the i-th page.
//Since we will be rendering with a 24-bit-per-pixel format, the required memory in bytes is height x width x 3.
destinations[i][j] = System.Runtime.InteropServices.Marshal.AllocHGlobal(tileBounds[i][j].Height * tileBounds[i][j].Width * 3);
}
}
//Start the actual rendering operations in parallel.
Parallel.For(0, document.Pages.Count, i =>
{
renderers[i].Render(renderedPageSizes[i], document.Pages[i].Bounds, destinations[i], PixelFormats.RGB);
});
//The code in this for-loop is not really part of MuPDFCore - it just shows an example of using VectSharp to "stitch" the tiles up and produce the full image.
for (int i = 0; i < document.Pages.Count; i++)
{
//Create a new (empty) image to hold the whole page.
VectSharp.Page renderedPage = new VectSharp.Page(renderedPageSizes[i].Width,
renderedPageSizes[i].Height);
//Draw each tile onto the image.
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
//Create a raster image object containing the pixel data. Yay, we do not need to copy/marshal anything!
VectSharp.RasterImage tile = new VectSharp.RasterImage(destinations[i][j], tileBounds[i][j].Width,
tileBounds[i][j].Height, false, false);
//Draw the tile on the main image page.
renderedPage.Graphics.DrawRasterImage(tileBounds[i][j].X0, tileBounds[i][j].Y0, tile);
}
//Save the full page as a PNG image.
renderedPage.SaveAsPNG(#"C:\install\page"+ i.ToString() + ".png");
}
//Clean-up code.
for (int i = 0; i < document.Pages.Count; i++)
{
//Release the allocated memory.
for (int j = 0; j < renderers[i].ThreadCount; j++)
{
System.Runtime.InteropServices.Marshal.FreeHGlobal(destinations[i][j]);
}
//Release the renderer (if you skip this, the quiescent renderer’s threads will not be stopped, and your application will never exit!
renderers[i].Dispose();
}
document.Dispose();
context.Dispose();
}

you can extract Image from PDF
and save as JPG
here is the sample code
you need Itext Sharp
public IEnumerable<System.Drawing.Image> ExtractImagesFromPDF(string sourcePdf)
{
// NOTE: This will only get the first image it finds per page.
var pdf = new PdfReader(sourcePdf);
var raf = new RandomAccessFileOrArray(sourcePdf);
try
{
for (int pageNum = 1; pageNum <= pdf.NumberOfPages; pageNum++)
{
PdfDictionary pg = pdf.GetPageN(pageNum);
// recursively search pages, forms and groups for images.
PdfObject obj = ExtractImagesFromPDF_FindImageInPDFDictionary(pg);
if (obj != null)
{
int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(CultureInfo.InvariantCulture));
PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
PdfStream pdfStrem = (PdfStream)pdfObj;
PdfImageObject pdfImage = new PdfImageObject((PRStream)pdfStrem);
System.Drawing.Image img = pdfImage.GetDrawingImage();
yield return img;
}
}
}
finally
{
pdf.Close();
raf.Close();
}
}