How to set initial view properties?

问题:

Here I want to set the already exist PDF document properties under Initial View tab in acrobat.

Document Options:

• Show = Bookmarks Panel and Page
• Page Layout = Continuous
• Magnification = Fit Width
• Open to Page number = 1

Window Options:

• Show = Document Title

As show in below screen shot:

I am tried following code:

PdfStamper stamper = new PdfStamper(reader, new FileStream(dPDFFile, FileMode.Create));
stamper.AddViewerPreference(PdfName.DISPLAYDOCTITLE, new PdfBoolean(true));

the above code is used to set the document title show.

But following code are not working

For Page Layout:

stamper.AddViewerPreference(PdfName.PAGELAYOUT, new PdfName("OneColumn"));

For Bookmarks Panel and Page:

stamper.AddViewerPreference(PdfName. PageMode, new PdfName("UseOutlines"));

So please give guide me what is the correct way to meet my requirement.

回答1:

I'm adding an extra answer in answer to the extra question in the comments of the previous answer:

When you have a PdfWriter instance named writer, you can set the Viewer preferences like this:

writer.ViewerPreferences = viewerpreference;

In this case, the viewerpreference is a value that can have one of the following values:

• PdfWriter.PageLayoutSinglePage
• PdfWriter.PageLayoutOneColumn
• PdfWriter.PageLayoutTwoColumnLeft
• PdfWriter.PageLayoutTwoColumnRight
• PdfWriter.PageLayoutTwoPageLeft
• PdfWriter.PageLayoutTwoPageRight

See the PageLayoutExample for more info.

You can also change the page mode as is shown in the ViewerPreferencesExample. In which case the different values are "OR"-ed:

• PdfWriter.PageModeFullScreen
• PdfWriter.PageModeUseThumbs
• PdfWriter.PageLayoutTwoColumnRight | PdfWriter.PageModeUseThumbs
• PdfWriter.PageModeFullScreen | PdfWriter.NonFullScreenPageModeUseOutlines
• PdfWriter.FitWindow | PdfWriter.HideToolbar
• PdfWriter.HideWindowUI

Currently, you've only used the PrintPreferences example from the official documentation:

writer.AddViewerPreference(PdfName.PRINTSCALING, PdfName.NONE);
writer.AddViewerPreference(PdfName.NUMCOPIES, new PdfNumber(3));
writer.AddViewerPreference(PdfName.PICKTRAYBYPDFSIZE, PdfBoolean.PDFTRUE); 

But in some cases, it's just easier to use:

writer.ViewerPreferences = viewerpreference;

Note that the official documentation is the book "iText in Action - Second Edition." The examples are written in Java, but you can find the C# version here. There is a new book in the works called "The ABC of PDF", but so far only 4 chapters were written. You'll find more info here: http://itextpdf.com/learn

The part about the different options to create a PdfDestination is already present in "The ABC of PDF".

As for setting the language, this is done like this:

stamper.Writer.ExtraCatalog.Put(PdfName.LANG, new PdfString("EN"));

The result is shown in the following screen shot:

As you can see, there is now a Lang entry with value EN added to the catalog.

回答2:

The two items Show = Bookmarks Panel and Page and Page Layout = Continuous are controlled one layer up from the ViewerPreferences in the document's /Catalog. You can get to this via:

stamper.Writer.ExtraCatalog

In your case you're looking for:

// Acrobat's Single Page
stamper.Writer.ExtraCatalog.Put(PdfName.PAGELAYOUT, PdfName.ONECOLUMN);
// Show bookmarks
stamper.Writer.ExtraCatalog.Put(PdfName.PAGEMODE, PdfName.USEOUTLINES);

The items Magnification = Fit Width and Open to Page number = 1 are also part of the /Catalog but in a special key called /OpenAction. You can set this using:

stamper.Writer.SetOpenAction();

In your case you're looking for:

//Create a destination that fit's width (fit horizontal)
var D = new PdfDestination(PdfDestination.FITH);

//Create an open action that points to a specific page using this destination
var OA = PdfAction.GotoLocalPage(1, D, stamper.Writer);

//Set the open action on the writer
stamper.Writer.SetOpenAction(OA);