images/image_from_url

 * Image from URL:

 * Read an image from an URL and place it in a PDF document

 *

 * Read an image from the URL and store into a PDFlib virtual file (PVF).

 * Then, load the image data from the PVF and place it on the page.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.images;

import java.io.*;

import java.net.*;

import com.pdflib.pdflib;

import com.pdflib.PDFlibException;

public class image_from_url

{

    public static void main (String argv[])

    {

    /* This is where the data files are. Adjust as necessary. */

    String searchpath = "../input";

    String outfile = "image_from_url.pdf";

    String title = "Image from URL";

    pdflib p = null;

    final String image_url = "http://www.pdflib.com/uploads/media/logo_01.gif";

    byte[] imageData = null;

    URL url = null;

    try {

        byte[] buffer = new byte[1024];

        /* Read an image from a Web site */

        url = new URL(image_url);

        InputStream inp = url.openStream();

        ByteArrayOutputStream bufferStream = new ByteArrayOutputStream();

        int bytesRead;

        while ((bytesRead = inp.read(buffer)) != -1) {

            bufferStream.write(buffer, 0, bytesRead);

        }

        imageData = bufferStream.toByteArray();

        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 + " $Revision: 1.6 $");

            /* Store the image in a PDFlib virtual file (PVF) called

             * "/pvf/image"

             */

            p.create_pvf("/pvf/image", imageData, "");

            /* Load the image from the PVF */

            int image = p.load_image("auto", "/pvf/image" , "");

            if (image == -1)

                throw new Exception("Error: " + p.get_errmsg());

            /* Start a page, place the image, and finish the page */

            p.begin_page_ext(400, 200, "");

            p.fit_image(image, 50, 100, "");

            p.end_page_ext("");

            /* Delete the virtual file to free the allocated memory */

            p.delete_pvf("/pvf/image");

            p.end_document("");

            } catch (PDFlibException e) {

                System.err.print("PDFlib exception occurred:\n");

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

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

            } catch (Exception e) {

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

            } finally {

                if (p != null) {

                    p.delete();

                }

            }

            } catch (IOException e) {

                System.err.print("Exception occurred: URL " + image_url +

                    " is not available\n");

                    e.printStackTrace();

            }

    }

}