Thanks for the help. I will read the chapter you mentioned and will
get the book to read the chapter about collection as well. I'm quite
new to itext and I'm sure it will help me understand more about itext.
In the mean time, I'm trying to see if I can follow the 1st solution
you mentioned with simplified codes (assume all files are in file
system).
// when I see an image, create a temporary outstream:
Document document = new Document();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, baos);
document.open();
Image image = Image.getInstance("C:\\Sunset.jpg");
document.newPage();
document.add(image);
document.close();
writer.close();
So at this point, the baos should hold the image.
Document document2 = new Document();
PdfCopy copy = new PdfCopy(document2, new FileOutputStream("C:\\test1.pdf"));
PdfReader reader2 = new PdfReader(baos.toByteArray());
PdfImportedPage page = copy.getImportedPage(reader2, 1);
copy.addPage(page);
document2.close();
copy.close();
baos.close();
But I kept getting java.lang.NullPointerException at copy.addPage(page);
at com.itextpdf.text.pdf.PdfWriter.getPageReference(PdfWriter.java:992)
at com.itextpdf.text.pdf.PdfWriter.getCurrentPage(PdfWriter.java:1010)
at com.itextpdf.text.pdf.PdfCopy.addPage(PdfCopy.java:356)
at MergePDF.main(MergePDF.java:100)
I checked the page variable, it's not null. Is there something I did wrong?
Thanks a lot!
Solution A: Use PdfCopy, and:
[1] when you encounter an image, create a single-page PDF using
PdfWriter in memory, and use that PDF.
[2] when you encounter a PDF (or when you've just created a single-page
PDF), create a PdfReader instance, and add PdfImportedPage objects to
PdfCopy.
On Fri, Sep 16, 2011 at 12:54 PM, 1T3XT BVBA <[email protected]> wrote:
> On 16/09/2011 17:53, mingqiang yu wrote:
>> Hi,
>>
>> Here is the problem I need to solve:
>>
>> I have a list of byte arrays which represents list of files. I need to
>> combine them into one pdf. They can be pdf, images, or information I
>> need to put into the new pdf.
>
> Aha, go to http://affiliate.manning.com/idevaffiliate.php?id=223_212
> There's a table "Resources" with a column "Downloads".
> Download chapter 6 (it's available for free), and you'll learn all about
> manipulating existing PDFs.
>
>> I cannot use PdfWriter because some pdfs contain not just content but
>> annotations
>
> That's also explained in chapter 6.
>
>> So, I have to use PdfCopy.
>
> Yes.
>
>> It works fine for any byte array which
>> represents pdf file. But for image files, I don't know how to put them
>> in. Here is what I came out but I kept getting
>> "PDF header signature not found." error:
>
> Er... image files are JPG, PNG, GIF,...
> Does it surprise you that these files don't have a PDF header signature?
>
>> Document itextDoc = new Document(PageSize.LETTER, 0, 0, 0, 0);
>> PdfCopy pdfCopy = new PdfCopy(itextDoc, fos);
>> FileOutputStream fos = new FileOutputStream(fileName);
> ???
> You are using the variable fos before you declare it.
> This code doesn't compile, does it?
>
>> // problem happens here because nothing is in pdfCopy yet.
>> PdfReader reader = new PdfReader(pdfCopy.getDirectContent().toPdf(pdfCopy));
>
> ???
> What are you trying to achieve? The above line is wrong for many
> different reasons!
>
>> itextDoc.open();
>>
>>
>> Image image =Image.getInstance(r.getData()); // get byte array data of
>> an image (say, png)
>> itextDoc.setMargins(10, 10, 10, 10);
>> image.scaleToFit(ITEXT_PDF_WIDTH - 20, ITEXT_PDF_HEIGHT - 20);
>
> Why are you creating a PdfStamper instance?
>> ByteArrayOutputStream baos = new ByteArrayOutputStream();
>> PdfStamper stamper = new PdfStamper(reader, baos);
>> PdfContentByte content = stamper.getOverContent(reader.getNumberOfPages());
>> content.addImage(image);
>> stamper.close();
>>
>> reader = new PdfReader(baos.toByteArray());
>> pdfCopy.addPage(pdfCopy.getImportedPage(reader, 1));
>> pdfCopy.freeReader(reader);
>> baos.close();
>>
>> Has anyone done this process before?
>
> Of course: plenty of people have achieved what you want to do.
>
> There are two solutions:
>
> Solution A: Use PdfCopy, and:
> [1] when you encounter an image, create a single-page PDF using
> PdfWriter in memory, and use that PDF.
> [2] when you encounter a PDF (or when you've just created a single-page
> PDF), create a PdfReader instance, and add PdfImportedPage objects to
> PdfCopy.
>
> Solution B: combine the different kinds of files AS-IS into a portable
> collection. Portable collections are explained in chapter 16 of the
> book. That chapter isn't available for free.
>
> ------------------------------------------------------------------------------
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>
> iText(R) is a registered trademark of 1T3XT BVBA.
> Many questions posted to this list can (and will) be answered with a
> reference to the iText book: http://www.itextpdf.com/book/
> Please check the keywords list before you ask for examples:
> http://itextpdf.com/themes/keywords.php
>
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_______________________________________________
iText-questions mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/itext-questions
iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
