PDFlib Cookbook

cookbook

general/starter_pvf

Create a PVF file which holds an image or PDF and import the data from the PVF file.

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<?php
#!/usr/bin/perl
#
# PDFlib Virtual File system (PVF):
# Create a PVF file which holds an image or PDF, and import the data from the
# PVF file
#
# This avoids disk access and is especially useful when the same image or PDF
# is imported multiply. For examples, images which sit in a database don't
# have to be written and re-read from disk, but can be passed to PDFlib
# directly in memory. A similar technique can be used for loading other data
# such as fonts, ICC profiles, etc.
#
# Required software: PDFlib/PDFlib+PDI/PPS 9
# Required data: image file

#
# Helper function to read the content of a file into a buffer
# avoids incompatible systemcalls

function read_file($fname)
{
    $fp = fopen($fname, "r");
    $data = fread ($fp, filesize($fname));
    fclose($fp);
    return $data;
} # read_file


# This is where the data files are. Adjust as necessary.
$searchpath = dirname(__FILE__,3)."/input";

try {
    # create a new PDFlib object
    $p = new PDFlib();


    $p->set_option("searchpath={" . $searchpath . "}");

    # This means we must check return values of load_font() etc.
    $p->set_option("errorpolicy=return");
    $p->set_option("stringformat=utf8");

    # open new PDF file; insert a file name to create the PDF on disk 
    if ($p->begin_document("", "") == 0) {
        echo("Error: " .  $p->get_errmsg());
        exit(1);
    }

    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", "PDFlib Virtual File System");

    # We just read some image data from a file; to really benefit
    # from using PVF read the data from a Web site or a database instead

    $imagedata = read_file(dirname(__FILE__,3)."/input/PDFlib-logo.tif");

    $p->create_pvf("/pvf/image", $imagedata, "");

    # Load the image from the PVF
    $image = $p->load_image("auto", "/pvf/image", "");
    if ($image == 0) {
        echo("Error: " .  $p->get_errmsg());
        exit(1);
    }

    # Fit the image on page 1
    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

    $p->fit_image($image, 350, 750, "");

    $p->end_page_ext("");

    # Fit the image on page 2
    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

    $p->fit_image($image, 350, 50, "");

    $p->end_page_ext("");

    # Delete the virtual file to free the allocated memory
    $p->delete_pvf("/pvf/image");

    $p->end_document("");

    $buf = $p->get_buffer();
    $len = strlen($buf);

    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=starter_pvf.pdf");
    print $buf;

}
catch (PDFlibException $e) {
    echo("PDFlib exception occurred in starter_pvf sample:\n" .
        "[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " .
        $e->get_errmsg() . "\n");
    exit(1);
}
catch (Throwable $e) {
    echo($e);
    exit(1);
}

$p = 0;

?>