PDFlib Cookbook

cookbook

pdf_import/import_repeated_contents

In order to keep the output file size small, handles to imported PDF pages or images should be reused for repeated contents.

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package com.pdflib.cookbook.pdflib.pdf_import;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

/**
 * Repeated contents: In order to keep the output file size as small as possible
 * handles to imported PDF pages or images can and should be reused for repeated
 * contents.
 * 
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF document, image file
 */
public class import_repeated_contents {
    public static void main(String argv[]) {
        /* This is where the data files are. Adjust as necessary. */
        String searchpath = "../input";
        String outfile = "import_repeated_contents.pdf";
        String title = "Repeated Contents";

        int pagecount = 3;

        pdflib p = null;
        String imagefile1 = "cambodia_preah_khan1.jpg";
        String imagefile2 = "cambodia_preah_khan2.jpg";
        String imagefile3 = "cambodia_preah_khan3.jpg";
        String background = "card.pdf";
        int exitcode = 0;

        try {
            p = new pdflib();

            p.set_option("searchpath={" + searchpath + "}");

            /* This means we must check return values of load_font() etc. */
            p.set_option("errorpolicy=return");

            if (p.begin_document(outfile, "") == -1)
                throw new Exception("Error: " + p.get_errmsg());

            p.set_info("Creator", "PDFlib Cookbook");
            p.set_info("Title", title);
            
            /* Load the font */
            int font = p.load_font("Helvetica", "unicode", "");
            if (font == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Load the three images */
            int image1 = p.load_image("auto", imagefile1, "");
            if (image1 == -1)
                throw new Exception("Error loading image " + imagefile1 + ": "
                    + p.get_errmsg());
            
            int image2 = p.load_image("auto", imagefile2, "");
            if (image2 == -1)
                throw new Exception("Error loading image " + imagefile2 + ": "
                    + p.get_errmsg());

            int image3 = p.load_image("auto", imagefile3, "");
            if (image3 == -1)
                throw new Exception("Error loading image " + imagefile3 + ": "
                    + p.get_errmsg());

            /* Open the card file */
            int card = p.open_pdi_document(background, "");
            if (card == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            /* Load the first page of the card file */
            int cardpage = p.open_pdi_page(card, 1, "");
            if (cardpage == -1)
                throw new Exception("Error: " + p.get_errmsg());

            /* Create textflow for explanation */
            String explanation =
                "Reuse PDI page, image and textflow handles across "
                    + "multiple pages";
            String optlist = "alignment=left font=" + font + " fontsize=20";
            int tf = p.create_textflow(explanation, optlist);
            if (tf == -1)
                throw new Exception("Error: " + p.get_errmsg());
            
            /* Query the width and height of the first page of the card */
            double cardwidth = p.pcos_get_number(card, "pages[0]/width");
            double cardheight = p.pcos_get_number(card, "pages[0]/height");

            /* Offset factor from page border for content */
            double offset = 0.15;
            
            /*
             * Now reuse the PDI page handle, the image handles and the
             * textflow handle on all the pages.
             */
            for (int page = 1; page <= pagecount; page += 1) {
                p.begin_page_ext(cardwidth, cardheight, "");

                /* Place the card page as background*/
                p.fit_pdi_page(cardpage, 0, 0, "");

                /* Place images */
                p.fit_image(image1,
                    cardwidth * offset, cardheight * offset, "");
                p.fit_image(image2,
                    cardwidth * (1 - offset), cardheight * offset,
                    "position={right bottom}");
                p.fit_image(image3,
                    cardwidth * (1 - offset), cardheight * (1 - offset),
                    "position={right top}");
                
                /* Place textflow, must be rewound each time */
                p.fit_textflow(tf, cardwidth * offset, cardheight * 0.5,
                    cardwidth * 0.5, cardheight * (1 - offset), "rewind=1");
                
                /* Create a page number at the bottom center of the page */
                p.fit_textline("- " + page + " -",
                    cardwidth * 0.5, cardheight * offset / 2,
                    "font=" + font + " fontsize=12 position=center");

                p.end_page_ext("");
            }

            /* Clean up all handles */
            p.close_image(image1);
            p.close_image(image2);
            p.close_image(image3);
            p.close_pdi_page(cardpage);
            p.close_pdi_document(card);
            p.delete_textflow(tf);

            p.end_document("");

        }
        catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname()
                + ": " + e.get_errmsg());
            exitcode = 1;
        }
        catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        }
        finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}