adding IFD GPS

hi,

i am new to this list and rather new to PHP too so i am a
little bit 
lost in the techie docs...

i found edit-description.php in the examples folder and work
with that 
one in order to get/add EXIF GPS information. getting and
setting of 
already existing GPS info works fine so far with

$gps = $ifd0->getSubIfd(PelIfd::GPS);
$lat = $gps->getEntry(PelTag::GPS_LATITUDE);
$lat->setValue(array(47,1),array(48,1),array(1234,100));

(btw. it took long for me to figure out that the three
arrays are not 
written as a 2-dimensional array whereas it is stored as
such). anyway, 
the problem i have is with the rather classical case of no
GPS section, 
having $ifd0->getSubIfd(PelIfd::GPS) == null. i was
hoping to create one 
with

$gps = new PelIfd();
$ifd0->addSubIfd($gps);
$lat = new PelEntryRational(PelTag::GPS_LATITUDE, 
array(11,1),array(22,1),array(33,1));
$gps->addEntry($lat);

but that doesn't work. what command am i missing here?

thank you for a helping hand and thanks for the API too!

andré


-- 
____________________________________________________________
_______
andre m. winter,
 cartography for internet and multimedia applications
 a6091 goetzens, tyrol, austria
 tel.: ++43.5234.32732
 email: <wintercarto.net>

<http://www.vectoreal.co
m/>          SVG consulting and development
<http://www.carto.net/>          online cartography focusing on SVG
<http://www.carto.at/>
    print and online touristic map solutions



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