I'm trying to add an image that I have on the filesystem as a pdf into a pdf that I'm creating on the fly.
I tried to use the Image class, but it seems that it does not work with PDFs (only JPEG, PNG or GIF). How can I create an element from an existing PDF, so that I can place it in my new PDF?
Please download chapter 6 of my book and read all about the class PdfImportedPage.
In the most basic example, you'd create a PdfReader instance and import the page into the PdfWriter instance, from which point on you can use the PdfImportedPage instance, either directly, or wrapped inside an Image object:
PdfReader reader = new PdfReader(existingPdf);
PdfImportedPage page = writer.getImportedPage(reader, i);
Image img = Image.getInstance(page);
reader.close();
Related
I have two pdfs, lets say content and header.
Now I want to add this header to the top of content.
So first, I have used Document, PdfWriter then took the PdfContentByte (canvas) to place the header.pdf inside content with desired location.
This addTemplate method breaks the format of PDF.
I already have string replacement method after this merging, which is not working now after this merge method.
After the suggestions from iText, I tried to use PdfCopy or PdfSmartCopy.
But how can we place this header in desired location using PdfCopy ?
If not, then how to merge without breaking the format of PDF using writer / pdfContentByte ?
Note:
I have tried to merge the Pdfs by using PdfCopy, but again its breaking.
PdfObject pdfObject = dict.GetDirectObject(PdfName.CONTENTS);
(pdfObject is PRStream)
Here the pdfObject is not a PRStream instead it becomes PdfArray.
Please help me to resolve this issue.
I am using iText7(java) and am looking for a way to convert a pdf page to image.
In older iText versions you could do this :
PdfImportedPage page = writer.getImportedPage(reader, 1);
Image image = Image.getInstance(page);
But iText7 does not have PdfImportedPage .
My use case, I have a one page pdf file. I need to add a table and resize the pdf contents to fit a single page. In old iText I would create a page , add table, convert existing pdf page to image, resize image and add that resized image to new page. Is there a new way to do this in iText7.
Thanks to Bruno's answer I got this working with following code :
PdfPage origPage = readerDoc.getPage(1);
Rectangle rect = origPage.getPageSize();
Document document = new Document(writerDoc);
Table wrapperTable = new Table(1);
Table containerTable = new Table(new float[]{0.5f,0.5f});
containerTable.setWidthPercent(100);
containerTable.addCell( "col1");
containerTable.addCell("col2");
PdfFormXObject pageCopy = origPage.copyAsFormXObject(writerDoc);
Image image = new Image(pageCopy);
image.setBorder(Border.NO_BORDER);
image.setAutoScale(true);
image.setHeight(rect.getHeight()-250);
wrapperTable.addCell(new Cell().add(containerTable).setBorder(Border.NO_BORDER));
wrapperTable.addCell(new Cell().add(image).setBorder(Border.NO_BORDER));
document.add(wrapperTable);
document.close();
readerDoc.close();
Please read the official documentation for iText 7, more specifically Chapter 6: Reusing existing PDF documents
In PDF, there's the concept of Form XObjects. A Form XObject is a piece of PDF content that is stored outside the content stream of a page, hence XObject which stands for eXternal Object. The use of the word Form in Form XObject could be confusing, because people might be thinking of a form as in a fillable form with fields. To avoid that confusing, we introduced the term PdfTemplate in iText 5.
The class PdfImportedPage you refer to was a subclass of PdfTemplate: it was a piece of PDF syntax that could be reused in another page. Over the years, we noticed that people also got confused by the word PdfTemplate.
In iText 7, we returned to the basics. When talking about a Form XObject, we use the class PdfFormXObject. When talking about a page in a PDF file, we use the class PdfPage.
This is how we get a PdfPage from an existing document:
PdfDocument origPdf = new PdfDocument(new PdfReader(src));
PdfPage origPage = origPdf.getPage(1);
This is how we use that page in a new document:
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
PdfFormXObject pageCopy = origPage.copyAsFormXObject(pdf);
If you want to use that pageCopy as an Image, just create it like this:
Image image = new Image(pageCopy);
I have a EaselJS Container object and I want to export its contents (children Bitmaps) as an image (similar to what you would do with ActionScript PNGEncoder.encode).
Is this possible? I have other object present that I don't want to export so exporting the full <canvas> wouldn't work.
You can use the getCacheDataURL method to export any cached DisplayObject to an image data url.
http://jsfiddle.net/lannymcnie/jqfgynve/1/
bmp.cache(0,0,image.width,image.height);
var url = bmp.getCacheDataURL();
var img = new Image();
img.src = url;
Any time you cache an image, a canvas is created that is drawn in place of the image. This method calls toDataURL() on the cache-canvas, generating a data URL that can be passed to the source of an image.
Note that the toDataURL is not a super performant API.
I want to insert a hyperlink into an existing PDF at a position I know in advance: I already have the coordinates of a rectangle on a given page. I want to link this rectangle to another page of the same PDF (which I also know in advance).
How do I achieve this?
Please take a look at the AddLinkAnnotation example.
As you (should) already know (but you didn't show what you've already tried, which is kind of mandatory on StackOverflow), you can use PdfStamper to manipulate an existing PDF. Adding a rectangular link on one page to another page, is as simple as adding a link annotation to that page:
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
Rectangle linkLocation = new Rectangle(523, 770, 559, 806);
PdfDestination destination = new PdfDestination(PdfDestination.FIT);
PdfAnnotation link = PdfAnnotation.createLink(stamper.getWriter(),
linkLocation, PdfAnnotation.HIGHLIGHT_INVERT,
3, destination);
link.setBorder(new PdfBorderArray(0, 0, 0));
stamper.addAnnotation(link, 1);
stamper.close();
The link object is created using:
the writer instance tied to the stamper,
the rectangle (the position you say you know in advance,
a highlighting option (pick one: HIGHLIGHT_NONE, HIGHLIGHT_INVERT, HIGHLIGHT_OUTLINE, HIGHLIGHT_PUSH, HIGHLIGHT_TOGGLE),
the page you want to link to,
a destination (different options are possible, see The ABC of PDF).
Once you have an instance of PdfAnnotation, you can add it to a specific page using the addAnnotation() method.
I'm wondering if the dimensions of a page can be altered after content has been added to it?
I'm creating a PDF document in code using iTextSharp, and placing some content on a page. I'll only know the height of the content after drawing it, then I need to basically "crop" the page, so that it's only as tall as the content.
I know I can do this by writing the content to a pdfTemplate, then doing SetPageSize() and NewPage(), then adding the template to the new page. However, this document must only have 1 page. That's the catch - I can't set the size of page 1 after the fact, only subsequent pages, but the doc must only contain one page.
Unless there's a way of deleting page 1 after adding the properly-sized second page, I can't think of how to achieve this: A one-page PDF whose page size I have to change after having written content to it.
I ended up doing the following:
Create document as a memorystream.
Create a pdfTemplate, add content to it and remember how big the content is.
Add a new (2nd) page, the same size as the content, and add template to it.
Reseek to start of memorystream, open a PdfReader on it.
Create a new PDF file with PdfCopy, copying the 2nd page from memory to the file.
After a day searching for a more direct method, this seemed the most expedient. Basically:
dim ms As New IO.MemoryStream
dim doc As New Document
dim pw As PdfWriter = PdfWriter.GetInstance(doc, ms)
doc.Open
Dim cb As PdfContentByte = pw.DirectContent
Dim tpl = cb.CreateTemplate(doc.PageSize.Width, doc.PageSize.Height)
... add content to template ...
' Add template to a new page of the right dimensions
doc.Add(New Paragraph(" ")) ' page 1 content required for NewPage to work
doc.SetPageSize(New Rectangle(width, height)) ' size of content we added
doc.NewPage()
cb.AddTemplate(tpl, 0, 0)
' Close our in-memory doc but leave stream open.
pw.CloseStream = False
pw.Close()
doc.Close()
' Now create actual file and write only second page of doc.
ms.Seek(0, IO.SeekOrigin.Begin) ' Go back to start of memorystream
Dim pr As New PdfReader(ms)
doc = New Document(pr.GetPageSizeWithRotation(2)) ' New doc, size of page 2
Dim copier As New PdfCopy(doc, New IO.FileStream(<filename>, IO.FileMode.Create))
doc.Open()
copier.AddPage(copier.GetImportedPage(pr, 2)) ' Add page 2 of our in-memory document.
copier.Close()
doc.Close()
pr.Close()
Now I have a PDF with a single page custom sized to the content which was added.
Hope it helps someone else!