Feature Requests item #1462964, was opened at 2006-04-02 10:00
Message generated for change (Comment added) made by lsolesen
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Category: None
Group: None
>Status: Closed
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Martin Geisler (mgeisler)
Summary: example of read / display
Initial Comment:
I found it very hard to get started with this library.
It looks really useful, but there's no generic example
of reading the header info.
It should be pretty simple for those who know the
library to produce an example that opens an image and
lists all the header information pel can see. I tried
to do this and got unexpected errors and found the API
very confusing.
I strongly expected to be able to do something like:
foreach ($mPelJpeg->getSections as $section) {
$marker = $section[0];
$content = $section[1];
print "marker : " . $marker->getName() . "<br>\n";
foreach ($content->Entries as $Entry) {
print $Entry->getName . "=" . $Entry->getText() . "<br>\n";
}
but I think I am clearly confused about what the model
is. I understand how to get at a specific tag if I
already know exactly where it is, but... a generic
example would be incredibly useful.
thanks
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>Comment By: Lars Olesen (lsolesen)
Date: 2010-02-24 10:46
Message:
Closing this for being out of date. Reopen if it is still an issue.
----------------------------------------------------------------------
Comment By: Martin Geisler (mgeisler)
Date: 2006-04-07 21:31
Message:
Logged In: YES
user_id=1264592
You are right that the documentation is lacking examples of
actual use of PEL --- the API is documented on the
class/method level, but the big picture is not that well
documented.
The code you wished for almost works as far as I can tell
from a bit of mental debugging: you should not treat $marker
as an object, it is a plain integer, namely one of the
constants in PelJpegMarker. I have just called it a
PelJpegMarker in the documentation to indicate that it isn't
any random integer...
Now that I think of it this is probably very
counter-intuitive. Maybe one could let these constants be
real objects, created only once (singletons) and accesible
from the PelJpegMarker class. I'll have to think about it
and see if it's possible at all with the level of OO
available in PHP5.
I will let this tracker item stay open until the
documentation is fixed or a better solution is implemented.
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