accessing EXIF information in a jpg image

[Bryan - Gendev]

Is there any foxpro code snippet anywhere to allow access to the EXIF information?
I have a 3rd party control which can read the EXIF information but not write any changes.
Thanx

GenDev

 

[mJindrova]

gendev,

Maybe help you this article:

https://www.levelextreme.com/Home/ShowHeader?Activator=23&ID=39275

mJindrova

 

[Mike Lewis]

It shouldn't be too difficult to write some suitable code yourself. The EXIF data is stored at a fixed position within the JPG, and it has a more-or-less fixed format. You can find the relevant details here:

https://www.media.mit.edu/pia/Resea...tarts from SOI(0xFFD8,in this APP1 data area.

One you have that information, you can use FILETOSTR() read the JPG into a memory variable, then make the changes you need, then use STRTOFILE() to write it back.

Mike

__________________________________
Mike Lewis (Edinburgh, Scotland)

Visual FoxPro articles, tips and downloads

 

[Bryan - Gendev]

I have since located the 'Help' file for my image control and find that some of the Exif functions are built in methods so no intention to confuse - sorry!

GenDev

 

[tomk3]

Hello,

exiftool (

https://exiftool.org/exiftool_pod.html)

can read and write data (with many options)
It is freeware and available as a commandline app.

Regards
tom

 

[Mike Lewis]

One of the nice things about the EXIFTOOL that Tom recommended is that it is not limited to graphics files. It appears to work with many other media types, including Kindle e-books (but for reading only, not read-write unfortunately - not sure why that should be).

Mike

__________________________________
Mike Lewis (Edinburgh, Scotland)

Visual FoxPro articles, tips and downloads

 

[Chris Miller]

no intention to confuse - sorry!

My own confusion is already done with in your other thread. Now just take one second to realize why I asked you to post your conclusion here and not there, gendev: Future users.

Don't forget the bigger picture of why this forum exists: To build a knowledgebase that answers question for people searching without even starting their own new threads. And in a case you put a question aside and solve it with other means, that's not perfect for someone looking for Exif information extraction code, but it makes clear this thread doesn't offer that, because you found a solution elsewhere.

Even better now, your conclusion caused tom to post another solution.

Chriss