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//
// PDF metadata example for PDFio.
//
// Copyright © 2023-2025 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
// Usage:
//
// ./pdfioinfo FILENAME.pdf
//
#include <pdfio.h>
#include <time.h>
#include <math.h>
//
// 'main()' - Open a PDF file and show its metadata.
//
int // O - Exit status
main(int argc, // I - Number of command-line arguments
char *argv[]) // Command-line arguments
{
const char *filename; // PDF filename
pdfio_file_t *pdf; // PDF file
pdfio_dict_t *catalog; // Catalog dictionary
const char *author, // Author name
*creator, // Creator name
*producer, // Producer name
*title; // Title
time_t creation_date, // Creation date
modification_date; // Modification date
struct tm *creation_tm, // Creation date/time information
*modification_tm; // Modification date/time information
char creation_text[256], // Creation date/time as a string
modification_text[256], // Modification date/time human fmt string
range_text[255]; // Page range text
size_t num_pages; // PDF number of pages
bool has_acroform; // Does the file have an AcroForm?
pdfio_obj_t *page; // Object
pdfio_dict_t *page_dict; // Object dictionary
size_t cur, // Current page index
prev; // Previous page index
pdfio_rect_t cur_box, // Current MediaBox
prev_box; // Previous MediaBox
// Get the filename from the command-line...
if (argc != 2)
{
fputs("Usage: ./pdfioinfo FILENAME.pdf\n", stderr);
return (1);
}
filename = argv[1];
// Open the PDF file with the default callbacks...
pdf = pdfioFileOpen(filename, /*password_cb*/NULL,
/*password_cbdata*/NULL, /*error_cb*/NULL,
/*error_cbdata*/NULL);
if (pdf == NULL)
return (1);
// Get the title, author, etc...
catalog = pdfioFileGetCatalog(pdf);
author = pdfioFileGetAuthor(pdf);
creator = pdfioFileGetCreator(pdf);
has_acroform = pdfioDictGetType(catalog, "AcroForm") != PDFIO_VALTYPE_NONE;
num_pages = pdfioFileGetNumPages(pdf);
producer = pdfioFileGetProducer(pdf);
title = pdfioFileGetTitle(pdf);
// Get the creation date and convert to a string...
if ((creation_date = pdfioFileGetCreationDate(pdf)) > 0)
{
creation_tm = localtime(&creation_date);
strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
}
else
{
snprintf(creation_text, sizeof(creation_text), "-- not set --");
}
// Get the modification date and convert to a string...
if ((modification_date = pdfioFileGetModificationDate(pdf)) > 0)
{
modification_tm = localtime(&modification_date);
strftime(modification_text, sizeof(modification_text), "%c", modification_tm);
}
else
{
snprintf(modification_text, sizeof(modification_text), "-- not set --");
}
// Print file information to stdout...
printf("%s:\n", filename);
printf(" Title: %s\n", title ? title : "-- not set --");
printf(" Author: %s\n", author ? author : "-- not set --");
printf(" Creator: %s\n", creator ? creator : "-- not set --");
printf(" Producer: %s\n", producer ? producer : "-- not set --");
printf(" Created On: %s\n", creation_text);
printf(" Modified On: %s\n", modification_text);
printf(" Version: %s\n", pdfioFileGetVersion(pdf));
printf(" AcroForm: %s\n", has_acroform ? "Yes" : "No");
printf(" Number of Pages: %u\n", (unsigned)num_pages);
// Report the MediaBox for all of the pages
prev_box.x1 = prev_box.x2 = prev_box.y1 = prev_box.y2 = 0.0;
for (cur = 0, prev = 0; cur < num_pages; cur ++)
{
// Find the MediaBox for this page in the page tree...
for (page = pdfioFileGetPage(pdf, cur);
page != NULL;
page = pdfioDictGetObj(page_dict, "Parent"))
{
cur_box.x1 = cur_box.x2 = cur_box.y1 = cur_box.y2 = 0.0;
page_dict = pdfioObjGetDict(page);
if (pdfioDictGetRect(page_dict, "MediaBox", &cur_box))
break;
}
// If this MediaBox is different from the previous one, show the range of
// pages that have that size...
if (cur == 0 ||
fabs(cur_box.x1 - prev_box.x1) > 0.01 ||
fabs(cur_box.y1 - prev_box.y1) > 0.01 ||
fabs(cur_box.x2 - prev_box.x2) > 0.01 ||
fabs(cur_box.y2 - prev_box.y2) > 0.01)
{
if (cur > prev)
{
snprintf(range_text, sizeof(range_text), "Pages %u-%u",
(unsigned)(prev + 1), (unsigned)cur);
printf("%16s: [%g %g %g %g]\n", range_text,
prev_box.x1, prev_box.y1, prev_box.x2, prev_box.y2);
}
// Start a new series of pages with the new size...
prev = cur;
prev_box = cur_box;
}
}
// Show the last range as needed...
if (cur > prev)
{
snprintf(range_text, sizeof(range_text), "Pages %u-%u",
(unsigned)(prev + 1), (unsigned)cur);
printf("%16s: [%g %g %g %g]\n", range_text,
prev_box.x1, prev_box.y1, prev_box.x2, prev_box.y2);
}
// Close the PDF file...
pdfioFileClose(pdf);
return (0);
}