PDFlib
PDFlib

images_per_page

PDF image extractor based on PDFlib TET.

Download Java Code     Show Output     Show Input PDF

package com.pdflib.cookbook.tet.image;


import java.io.PrintStream;

import java.io.UnsupportedEncodingException;


import com.pdflib.TETException;

import com.pdflib.TET;


/**

 * PDF image extractor based on PDFlib TET.

 * <p>

 * Required software: TET 3

 * <p>

 * Required data: PDF document

 *

 * @version $Id: images_per_page.java,v 1.1 2010/07/20 14:27:59 stm Exp $

 */

public class images_per_page

{

    /**

     * Global option list

     */

    static final String GLOBAL_OPTLIST = "searchpath={../resource/cmap "

        + "../resource/glyphlist ../input}";

   

    /**

     * Document-specific option list

     */

    static final String DOC_OPTLIST = "";

   

    /**

     * Page-specific option list

     */

    static final String PAGE_OPTLIST = "granularity=page";

   

    /**

     * Basic image extract options (more below)

     */

    static final String BASE_IMAGE_OPTLIST = "compression=auto format=auto";


    /**

     * The encoding in which the output is sent to System.out. For running the

     * example in a Windows command window, you can set this for example to

     * "windows-1252" for getting Latin-1 output.

     */

    private static final String OUTPUT_ENCODING = System

            .getProperty("file.encoding");


    /**

     * For printing to System.out in the encoding specified via OUTPUT_ENCODING.

     */

    private static PrintStream out;

   

    public static void main(String argv[]) throws UnsupportedEncodingException {

        System.out.println("Using output encoding \"" + OUTPUT_ENCODING + "\"");

        out = new PrintStream(System.out, true, OUTPUT_ENCODING);


        TET tet = null;


        try {

            if (argv.length != 1) {

                throw new Exception("usage: images_per_page <filename>");

            }


            String outfilebase = argv[0];


            tet = new TET();


            tet.set_option(GLOBAL_OPTLIST);


            int doc = tet.open_document(argv[0], DOC_OPTLIST);

            if (doc == -1) {

                throw new Exception("Error " + tet.get_errnum() + "in "

                        + tet.get_apiname() + "(): " + tet.get_errmsg());

            }


            /* get number of pages in the document */

            int n_pages = (int) tet.pcos_get_number(doc, "length:pages");


            /* loop over pages */

            for (int pageno = 1; pageno <= n_pages; ++pageno) {

                int page = tet.open_page(doc, pageno, PAGE_OPTLIST);


                if (page < 0) {

                    print_tet_error(tet, pageno);

                    continue; /* try next page */

                }


                /* Retrieve all images on the page */

                int imageno = -1;

                while (tet.get_image_info(page) == 1) {

                    imageno++;


                    /*

                     * Use the name of the input file and generate image

                     * names from it.

                     */

                    String imagename = outfilebase + "_p" + pageno

                                                    + "_" + imageno;

                    String imageoptlist = BASE_IMAGE_OPTLIST

                        + " filename={" + imagename + "}";


                    out.println("Extracting image " + imagename);

                   

                    /* Fetch the image data and write it to a disk file */

                    if (tet.write_image_file(doc, tet.imageid,

                                    imageoptlist) == -1) {

                        print_tet_error(tet, pageno);

                    }

                }


                if (tet.get_errnum() != 0) {

                    print_tet_error(tet, pageno);

                }


                tet.close_page(page);

            }


            tet.close_document(doc);

        }

        catch (TETException e) {

            System.err.println("TET exception occurred in extractor sample:");

            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname()

                    + ": " + e.get_errmsg());

        }

        catch (Exception e) {

            System.err.println(e.getMessage());

        }

        finally {

            if (tet != null) {

                tet.delete();

            }

        }

    }


    /**

     * Report a TET error.

     *

     * @param tet

     *            The TET object

     * @param pageno

     *            The page number on which the error occurred

     */

    private static void print_tet_error(TET tet, int pageno) {

        System.err.println("Error " + tet.get_errnum() + " in  "

                + tet.get_apiname() + "() on page " + pageno + ": "

                + tet.get_errmsg());

    }

}