PDFlib サンプル集(クックブック)
PDFlib で、URL からイメージを読み、PDF 文書に配置するサンプルプログラムです。
URL からイメージを読み込み、PDFlib 仮想ファイル (PVF) に格納します。PVF からイメージデータを読み込み、ページ上に配置します。
必要な製品:PDFlib または PDFlib+PDI または PPS
/*
* 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;
int exitcode = 0;
final String image_url = "https://www.pdflib.com/fileadmin/cookbooks/PDFlib/PDFlib-cookbook/input/PDFlib-logo.tif";
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);
/*
* 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.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);
}
} catch (IOException e) {
System.err.println("Exception occurred: URL " + image_url + " is not available");
e.printStackTrace();
exitcode = 1;
System.exit(exitcode);
}
}
}
(Apr 3, 2007 - Oct 21, 2022)