Concatenate / Merge PDF files and Add Content
Updated 2010-08-23. The demo page now uses this code, which requires iTextSharp 5.XX.
private void _concatAndAddContent(List<string> pdf) {
Response.ContentType = "application/pdf";
Response.AppendHeader(
"Content-Disposition",
string.Format(
"attachment; filename={0}.pdf",
Path.GetFileName(pdf[0])
)
);
Document document = new Document();
PdfCopy copy = new PdfCopy(document, Response.OutputStream);
document.Open();
PdfImportedPage page;
// this object **REQUIRED** to add content when concatenating PDFs
PdfCopy.PageStamp stamp;
// image watermark/background
Image pdfImage = Image.GetInstance(
Request.MapPath("cat/kuujinbo2.gif")
);
pdfImage.SetAbsolutePosition(200, 400);
// set transparency
PdfGState state = new PdfGState();
state.FillOpacity = 0.3F;
state.StrokeOpacity = 0.3F;
foreach (string p in pdf) {
string pPath = Request.MapPath(
string.Format("cat/{0}.pdf", p)
);
PdfReader reader = new PdfReader(
new RandomAccessFileOrArray(pPath), null
);
int pages = reader.NumberOfPages;
// loop over document pages
for (int i = 0; i < pages; ) {
page = copy.GetImportedPage(reader, ++i);
stamp = copy.CreatePageStamp(page);
PdfContentByte cb = stamp.GetUnderContent();
cb.SaveState();
cb.SetGState(state);
cb.AddImage(pdfImage);
stamp.AlterContents();
copy.AddPage(page);
}
}
document.Close();
}
Simple Solution
Posted 2010-08-23 for a work request to append an informational message (single-page PDF file) to a library of existing PDF documents. iTextSharp 4.XX.
private void _write(List<string> pdf) {
Document document = null;
PdfCopy writer = null;
try {
Response.ContentType = "application/pdf";
Response.AppendHeader(
"Content-Disposition",
string.Format(
"attachment; filename={0}.pdf",
Path.GetFileName(pdf[0])
)
);
document = new Document();
writer = new PdfCopy(document, Response.OutputStream);
document.Open();
foreach (string lpdf in pdf) {
string pdf_path = Request.MapPath(
string.Format(@"cat/{0}.pdf", lpdf)
);
PdfReader reader = new PdfReader(
new RandomAccessFileOrArray(pdf_path), null
);
int n = reader.NumberOfPages;
// add content, page-by-page
PdfImportedPage page;
for (int p = 0; p < n; ) {
++p;
page = writer.GetImportedPage(reader, p);
writer.AddPage(page);
}
}
} catch {
throw;
} finally {
if (document != null && document.IsOpen() ) document.Close();
}
}
Links
