Extracting Exif Data

jesb4ppc · #1 (**permalink**) 02-13-2008, 07:52 PM

Hi everyone,

I'm wondering if it's possible to extract and use the exif data from a .JPG file. I guess that opening the .jpg file in byte mode will be the first approching, but is there any function/object/dll or something to do it?

Thanks in advance,

Jes.

Erel · #2 (**permalink**) 02-14-2008, 11:40 AM

It is possible to do it using the BinaryFile.
The Exif raw format is pretty complicated so it is not an easy task.
There is no built-in function that does it.

jesb4ppc · #3 (**permalink**) 02-14-2008, 06:37 PM

Ok. thank you.

tigme · #4 (**permalink**) 02-17-2008, 06:20 AM

I have done a similar thing extracting IPTC data from JPEG reading the file in binary with PHP4 and then do a search for tags to find the Caption of a photo created in Photoshop (for example). So theoretically finding EXIF would be same.

What I would like to know is:

Does anybody have some advice writing your own IPTC/EXIF data into a JPEG. I'm developing an App where the client can edit upload his pics and then FTP them as needed.

I want to do an FTP Client in B4PPC that can resize/ftp JPEG to an FTP server...

maXim · #5 (**permalink**) 02-19-2008, 12:30 PM

Hi jesb4ppc,

Look the Thread "db2000 - JPEG Exif" in "Italian Forum"...
Full Basic4ppc OpenSource!

Best Regards.

maXim

Erel · #6 (**permalink**) 02-19-2008, 03:28 PM

http://www.basic4ppc.com/forum/italian-forum/1790-db2000-jpeg-exif.html#post9815

HARRY · #7 (**permalink**) 02-20-2008, 05:06 PM

Hi,

Quite some time ago I have written in Visual Basic some routines to extract data from a JPEG file: the date a photo was made; the width and the height.

Today, thanks to the excellence of Basic4PPC and the support organization, I have made the same functionality in Basic4PPC.

Attached you will find the demonstration program, containing two routines. It is eay to incorporate those routines in another program: the interface is just a call with the filename and a structure to receive the data. Another structure is required for the routines.

For those who require other information to extract, on http://www.exif.org/Exif2-2.PDF you will find the codes for all other information. Adding Manufacturer and Model took me a quarter of an hour.

The JFIF format is not (yet) supported; if some body would like that to be supported, please let me know.

Harry

Harry

Erel · #8 (**permalink**) 02-20-2008, 05:14 PM

Great job HARRY!

maXim · #9 (**permalink**) 02-21-2008, 06:52 AM

Hi Harry,

I see with pleasure Your interest to the Exif data! I would like to exchange the experiences but there is only a problem: I don't know very the language English

... You know Italian language? (also few little)

Best Regards.

maXim

jesb4ppc · #10 (**permalink**) 02-21-2008, 07:48 AM

Thank you very much to you all, specially maXim and Harry.

That's another side of basic4ppc. Is not only the tool itself, but also the people around it.

Thank you again.