richyrich

Another iTextSharp blog post, this time on setting the initial zoom for a document.

Couldn't find an exact example of how to do this, but managed to cobble this together from a variety of code snippets I found.

You can set the initial zoom of a document using iTextSharp by adding a SetOpenAction method to the PdfWriter object. I found I could only add this once the document had been opened using doc.Open(), otherwise I got an "Object reference" error. This I presumed was referring to the writer object.

Code:

        PdfWriter writer = PdfWriter.GetInstance(doc, HttpContext.Current.Response.OutputStream);

        //this creates a new destination to send the action to when the document is opened. The zoom in this instance is set to 0.75f (75%). Again I use doc.PageSize.Height to set the y coordinate to the top of the page. PdfDestination.XYZ is a specific PdfDestination Type that allows us to set the location and zoom.
        PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 0.75f);

         //open our document
         doc.Open();

         //here you put all the information you want to write to your PDF

        //create a new action to send the document to our new destination.
        PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);

        //set the open action for our writer object
        writer.SetOpenAction(action);

        //finally, close our document
        doc.Close();

This should set the initial destination of our iTextSharp PDF document to page 1, location 0, page height, with a zoom of 0.75.

Hope that helps someone.