Q:
Could you provide a short sample code to perform the following?
1) Open an existing PDF on disk
2) Print "Hello World" on the footer of each existing page
3) Save the PDF to disk
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A:
Here is an example of how to append a footer to every page in an
existing document:
PDFDoc doc = new PDFDoc("in.pdf");
doc.InitSecurityHandler();
ElementBuilder eb = new ElementBuilder(); ElementWriter writer = new
ElementWriter();
PageIterator end = doc.PageEnd();
for (PageIterator itr=doc.PageBegin(); itr!=end; itr.Next()) {
writer.Begin(itr.Current());
Element element = eb.CreateTextBegin(Font.Create(doc,
Font.StandardType1Font.e_times_roman), 64);
writer.WriteElement(element);
element = eb.CreateTextRun("Hello World!");
element.SetTextMatrix(1, 0, 0, 1, 20, 20); // Position the text run
writer.WriteElement(element);
writer.WriteElement(eb.CreateTextEnd()); // Finish the block of text
writer.End(); // Save changes
}
doc.Save("out.pdf", 0);
doc.Close();
For an extended example of how to use ElementBuilder/ElementWriter,
please take a look at ElementBuilder sample project
(www.pdftron.com/net/samplecode.html#ElementBuilder).