PDFlib Cookbook

cookbook

pdf_import/starter_pdfmerge

Merge pages from multiple PDF documents.

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/*
 * PDF merge starter:
 * Merge pages from multiple PDF documents
 *
 * Interactive elements (e.g. bookmarks) will be dropped.
 *
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF documents
 */
package com.pdflib.cookbook.pdflib.pdf_import;

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

public class starter_pdfmerge
{
    public static void main (String argv[])
    {
	/* This is where the data files are. Adjust as necessary. */
	String searchpath = "../input";
	String outfile = "starter_pdfmerge.pdf";
	String title = "Starter PDF Merge";

	pdflib p = null;
	int exitcode = 0;
	String pdffiles[] =
	{
	    "PDFlib-datasheet.pdf",
	    "PLOP-datasheet.pdf",
	    "pCOS-datasheet.pdf"
	};
	int i;

	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);

	    for (i=0; i < pdffiles.length; i++)
	    {
	    int indoc, endpage, pageno, page;

	    /* Open the input PDF */
	    indoc = p.open_pdi_document(pdffiles[i], "");
	    if (indoc == -1)
	    {
		System.err.println("Error: " + p.get_errmsg());
		continue;
	    }

	    endpage = (int) p.pcos_get_number(indoc, "length:pages");

	    /* Loop over all pages of the input document */
	    for (pageno = 1; pageno <= endpage; pageno++)
	    {
		page = p.open_pdi_page(indoc, pageno, "");

		if (page == -1)
		{
		System.err.println("Error: " + p.get_errmsg());
		continue;
		}
		/* Page size may be adjusted by fit_pdi_page(). */
		p.begin_page_ext(0, 0, "width=a4.width height=a4.height");

		/* Create a bookmark with the file name */
		if (pageno == 1)
		p.create_bookmark(pdffiles[i], "");

		/* Place the imported page on the output page, and
		 * adjust the page size
		 */
		p.fit_pdi_page(page, 0, 0, "adjustpage");
		p.close_pdi_page(page);

		p.end_page_ext("");
	    }
	    p.close_pdi_document(indoc);
	    }

	    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);
        }
    }
}