demos/c_simple/meta_data.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    Meta-data storage operations example.
  26
  27    Meta-data storage is used to store image meta-data (if present) such as
  28    physical size, creation date, etc...
  29
  30    Meta-data storage is basically an typed dictionary.
  31
  32    This example shows low-level interface to GP_MetaData structure.
  33
  34   */
  35
  36 #include <stdio.h>
  37
  38 #include <GP.h>
  39
  40 int main(void)
  41 {
  42         GP_MetaData *data = GP_MetaDataCreate(10);
  43
  44         //GP_SetDebugLevel(10);
  45
  46         if (data == NULL)
  47                 return 1;
  48
  49         /*
  50          * Create integer
  51          *
  52          * May fail, if there is allready record with id 'dpi' or
  53          * if there is no space left.
  54          */
  55         GP_MetaDataCreateInt(data, "dpi", 300);
  56
  57         /*
  58          * Create an string.
  59          *
  60          * The last parameter says, if the string should be duplicated
  61          * in the metadata storage.
  62          */
  63         GP_MetaDataCreateString(data, "author", "Foo Bar <foo@bar.net>", 0, 1);
  64         GP_MetaDataCreateString(data, "comment", "Created in hurry.", 0, 1);
  65         GP_MetaDataCreateDouble(data, "pi", 3.141592);
  66
  67         const char *ret;
  68
  69         ret = GP_MetaDataGetString(data, "comment");
  70
  71         if (ret != NULL)
  72                 printf("Found string 'comment' = '%s'\n", ret);
  73         else
  74                 printf("ERROR: cannot cound string 'comment'\n");
  75
  76         printf("\n");
  77
  78         /*
  79          * Print all meta-data
  80          */
  81         GP_MetaDataPrint(data);
  82
  83         return 0;
  84 }