Solved!
I used another algorythm for the concatenation:
public Byte[] ConcatPdf(List<Byte[]> sourceFiles, Boolean PrintWhenOpen =
false)
{
Document document = new Document();
MemoryStream output = new MemoryStream();
try
{
// Initialize pdf writer
PdfWriter writer = PdfWriter.GetInstance(document, output);
writer.PageEvent = new PdfPageEvents();
if (PrintWhenOpen)
{
PdfAction action_apristampa = new
PdfAction(PdfAction.PRINTDIALOG);
writer.SetOpenAction(action_apristampa);
}
// Open document to write
document.Open();
PdfContentByte content = writer.DirectContent;
// Iterate through all pdf documents
for (Int32 fileCounter = 0; fileCounter < sourceFiles.Count;
fileCounter++)
{
// Create pdf reader
PdfReader reader = new
PdfReader(sourceFiles[fileCounter]);
Int32 numberOfPages = reader.NumberOfPages;
// Iterate through all pages
for (Int32 currentPageIndex = 1; currentPageIndex <=
numberOfPages; currentPageIndex++)
{
// Determine page size for the current page
document.SetPageSize(reader.GetPageSizeWithRotation(currentPageIndex));
// Create page
document.NewPage();
PdfImportedPage importedPage =
writer.GetImportedPage(reader, currentPageIndex);
// Determine page orientation
Int32 pageOrientation =
reader.GetPageRotation(currentPageIndex);
if ((pageOrientation == 90) || (pageOrientation ==
270))
content.AddTemplate(importedPage, 0, -1f, 1f, 0,
0, reader.GetPageSizeWithRotation(currentPageIndex).Height);
else
content.AddTemplate(importedPage, 1f, 0, 0, 1f,
0, 0);
}
ConcatPdf_NumPag += numberOfPages;
}
}
catch (Exception exception)
{
throw new Exception("There has an unexpected exception" +
" occured during the pdf merging process.",
exception);
}
finally
{
document.Close();
}
return output.GetBuffer();
}
internal class PdfPageEvents : IPdfPageEvent
{
#region members
private BaseFont _baseFont = null;
private PdfContentByte _content;
#endregion
#region IPdfPageEvent Members
public void OnOpenDocument(PdfWriter writer, Document document)
{
_baseFont = BaseFont.CreateFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
_content = writer.DirectContent;
}
public void OnStartPage(PdfWriter writer, Document document)
{ }
public void OnEndPage(PdfWriter writer, Document document)
{
// Write header text
String headerText = "PDF Merger by Smart-Soft";
_content.BeginText();
_content.SetFontAndSize(_baseFont, 8);
_content.SetTextMatrix(GetCenterTextPosition(headerText,
writer), writer.PageSize.Height -
10);
_content.ShowText(headerText);
_content.EndText();
// Write footer text (page numbers)
String text = "Page " + writer.PageNumber;
_content.BeginText();
_content.SetFontAndSize(_baseFont, 8);
_content.SetTextMatrix(GetCenterTextPosition(text, writer),
10);
_content.ShowText(text);
_content.EndText();
}
public void OnCloseDocument(PdfWriter writer, Document document)
{ }
public void OnParagraph(PdfWriter writer,
Document document, Single paragraphPosition)
{ }
public void OnParagraphEnd(PdfWriter writer,
Document document, Single paragraphPosition)
{ }
public void OnChapter(PdfWriter writer, Document document,
Single paragraphPosition, Paragraph title)
{ }
public void OnChapterEnd(PdfWriter writer,
Document document, Single paragraphPosition)
{ }
public void OnSection(PdfWriter writer, Document document,
Single paragraphPosition, Int32 depth, Paragraph
title)
{ }
public void OnSectionEnd(PdfWriter writer,
Document document, Single paragraphPosition)
{ }
public void OnGenericTag(PdfWriter writer, Document document,
Rectangle rect, String text)
{ }
#endregion
private Single GetCenterTextPosition(String text, PdfWriter
writer)
{
return writer.PageSize.Width / 2 -
_baseFont.GetWidthPoint(text, 8) / 2;
}
}
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