What is the easy way to read and write GPS data?

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What is the easy way to read and write GPS data?
	2007-10-15 11:00:00

Hello guys, I'm very new to OOP and PEL is really scares me. I'm trying to read GPS data from photos, but I can't. I'm trying this: -------------------- $file = "/home/re/gps1.jpg"; $data = new PelDataWindow(file_get_contents($file)); $jpeg = new PelJpeg(); $jpeg->load($data); $app1 = $jpeg->getExif(); $tiff = $app1->getTiff(); $ifd0 = $tiff->getIfd(); $entry = $ifd0->getEntry(PelTag::GPS_LONGITUDE); print "Longitude: ".$entry; -------------------- But I get nothing. What am I doing wrong? Another question is how can I easy add Exiff data, even if JPEG file doesn't have any Exif data in it? Is there any PHP sample that shows how can I do it?
Re: What is the easy way to read and write GPS data?
Denmark	2007-10-18 14:44:26
"Al Pro" <applepro7777gmail.com> writes: Hi, Your message was stuck in moderation -- I have now configured the list to allow your address to post. I've CCed this reply to you too, let us know if you don't want that. > I'm very new to OOP and PEL is really scares me. Well, PEL is rather OO heavy... consider it a fun way to learn OO > I'm trying to read GPS data from photos, but I can't. > > I'm trying this: > > -------------------- > $file =3D "/home/re/gps1.jpg"; > $data =3D new PelDataWindow(file_get_contents($file)); > > $jpeg =3D new PelJpeg(); > $jpeg->load($data); In PEL 0.9.1 you can simply do $jpeg =3D new PelJpeg($file); and then PEL will figure out to load the data from the file. It is simply shorter than what you wrote, but does the same. > $app1 =3D $jpeg->getExif(); > $tiff =3D $app1->getTiff(); > > $ifd0 =3D $tiff->getIfd(); > $entry =3D $ifd0->getEntry(PelTag::GPS_LONGITUDE); > > print "Longitude: ".$entry; > -------------------- > > But I get nothing. What am I doing wrong? The GPS data is not stored in the IFD0. So the getEntry() call returns null. You need to do: $gps =3D $ifd0->getSubIfd(PelIfd::GPS); and then your GPS_LONGITUDE entry should be in the $gps IFD. If you think this is complicated, then I agree PEL parses the structure for you, but you still need to know where to find the right bits of information. Using the dump-image.php file can help. > Another question is how can I easy add Exiff data, even if JPEG file > doesn't have any Exif data in it? Is there any PHP sample that shows > how can I do it? Please have a look at this URL in which a user explained how he added data (including GPS!) to an empty JPEG file: http://sf.net/tracker/?fun c=3Ddetail&atid=3D650323&aid=3D1815728&group_id= =3D108380 =2D-=20 Martin Geisler --- <mgeislermgeisler.net> --- http://mgeisler.net ------------------------------------------------------------ ------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ PEL-devel mailing list PEL-devellists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pel-devel

Re: What is the easy way to read and write GPS data?
	2007-10-19 10:32:43

>>>;> Your message was stuck in moderation -- I have now configured the listto allow your address to post. I've CCed this reply to you too, let us I9;m new to mailing lists. I wonder, why I can't see your message in pel-devel lists? And how can I post replies there? > I'm very new to OOP and PEL is really scares me. >>>>; Well, PEL is rather OO heavy... consider it a fun way to learn OO I actually read little bit about OO in PHP book I have, I need to buy some book for professional I think. > I'm trying to read GPS data from photos, but I can't. >>>> In PEL 0.9.1 you can simply do >>;>> $jpeg = new PelJpeg($file); >>>> The GPS data is not stored in the IFD0. So the getEntry() call returns >>>;> null. You need to do: >>>> >>>> $gps = $ifd0->getSubIfd(PelIfd::GPS); >>>> >>>> and then your GPS_LONGITUDE entry should be in the $gps IFD. >;>>> >>>> If you think this is complicated, then I agree PEL parses the >>>> structure for you, but you still need to know where to find the right >>>>; bits of information. Using the dump-image.php file can help. Thanks Martin.   > Another question is how can I easy add Exiff data, even if JPEG file > doesn't have any Exif data in it? Is there any PHP sample that shows > how can I do it? >>>> Please have a look at this URL in which a user explained how he added >>>>; data (including GPS!) to an empty JPEG file: >>>>; http://sf.net/tracker/?func=detail&atid=650323&aid=1815728&group_id=108380 That's exactly what I need. Thanks. Can you tell me what includes does it needs? Is convertGps() a part of PEL?
Re: What is the easy way to read and write GPS data?
Denmark	2007-10-21 13:19:51
"Al Pro" <applepro7777gmail.com> writes: >> Your message was stuck in moderation -- I have now configured the > > I'm new to mailing lists. I wonder, why I can't see your message in > pel-devel lists? And how can I post replies there? You are thinking of the archive at SourceForge, right: http://sf.net/mailarchive/forum.php?forum_name=3Dpel-d evel I don't know why my reply hasn't showed up there yet. It is archived at the other archives that carry the pel-devel list: http://article.gmane.org/gmane.comp.web.pel.devel/183 http://www.mail -archive.com/pel-devellists.sourceforge.net/msg00149.html To post replies you have to use the "reply-all" button in your email client -- the important point is that you include pel-devellists.sourceforge.net as a recipient. By the way, I have just redirected your last mail (the one I am replying to) to the list >>> Another question is how can I easy add Exiff data, even if JPEG >>> file doesn't have any Exif data in it? Is there any PHP sample >>> that shows how can I do it? >> >> Please have a look at this URL in which a user explained how he >> added data (including GPS!) to an empty JPEG file: >> http://sf.net/tracker/?func =3Ddetail&atid=3D650323&aid=3D1815728&group_i= d=3D108380 > > That's exactly what I need. Thanks. Can you tell me what includes > does it needs? Is convertGps() a part of PEL? No, convertGps is a custom function written by Andac. The complete source is now online here: http://sf.net/tracker/index.ph p?func=3Ddetail&aid=3D1816464&group_id=3D10= 8380&atid=3D650324 I will of course put it in PEL when it has been cleaned up a bit. =2D-=20 Martin Geisler --- <mgeislermgeisler.net> --- http://mgeisler.net ------------------------------------------------------------ ------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ PEL-devel mailing list PEL-devellists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pel-devel

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