As long as preventing users to download a picture you display, my .02Eu
opinion is that is is a fruitless task. A determined user will _always_
find a way to store the picture you send him. After all, you do send
data to him, therefore the data can be manipulated at will:-)
As far as some code to do it, see attached souce.
In the attached source, modify directories as needed.
Invoke with : php -q gif2function.php > test.php
Then point your browser to test.php.
warning: Select a dir with few images. If yopu want to know what happens
when you overdo it, goto
<URL:http://helios.mm.di.uoa.gr/~rouvas/giflib.php> to see what happened
to me!
tested only on linux.
Kevin Stone wrote:
>
> Huh.. hmm.. maybe this is possible after all. I'll have to test that
> out when I get home. If it works it could sure save me a headache or
> two.
>
> By the way most counters/trackers that I've seen are just simple
> javascripts which gather the browser information then request a tiny
> image from the server with the information in the URL string. This all
> goes into the server's standard log file. Then to count the hit the
> server just reads the log file and parses out the values in the URL
> string. But I guess it's the same basic principle.
>
> -Kevin
>
> -----Original Message-----
> From: Justin French [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, March 26, 2002 5:24 PM
> To: php
> Subject: Re: [PHP] Loading Images
>
> Ummmm, is that correct?
>
> I thought (although never tried) that you could reference an image as
>
> <IMG SRC="image.php?id=3"> or simular, in which case the headers and
> everything else CAN be sent in the image tag, which is embeded in a HTML
> page -- isn't that how they do counters etc etc??
>
> At the moment, I'm just storing my images in my file system, and storing
> the
> URLs in my database (as discussed by someone else in this thread), which
> works fine, as long as nobody deletes the image without deleting the URL
> from the DB.
>
> On the topic of preventing users from saving images, the attempts are
> futile, because they can also just look at your source to DL the image
> from
> it's URL.
>
> One thing I have seen work instead of disabling right-click is to have a
> clear layer (DIV) above the whole page, which (for me) prevents me from
> selecting text + images from below. Although I don't know how reliable
> this
> is.
>
> Justin French
> ---------------------
> http://indent.com.au
> http://soundpimps.com
> ---------------------
>
> on 27/03/02 10:16 AM, Kevin Stone ([EMAIL PROTECTED]) wrote:
>
> > It is quite easy to store images in a database and display them on the
> > screen. You can find tutorials about this online (sorry I don't have
> > any direct links). There are also numerous FREE scripts pre-written
> > that you can integrate into your site, or use to learn how to do this
> > yourself.
> >
> > There is a catch however... and that is you will not be able to
> display
> > anything else along with those images because special content headers
> > must be sent to let the browser know what kind of data it's receiving.
> > Is it a JPEG, GIF or PNG? If the headers are not sent, or the wrong
> > headers are sent, the image will either not display or the user will
> see
> > endless rows of junk text spewed onto the screen (the binary data in
> > ASCII form!!).
> >
> > So this method will only work if you want to display the images in a
> > frame, one at a time, and by them selves. You won't be able to
> > intermingle HTML so forget about doing dynamic menus with this method.
> >
> > The way these dynamic sites work is by storing the paths to each image
> > in the database rather than the images themselves... so you're back to
> > the file system solution.
> >
> > Anyway I hope this helps answer some of the questions you were having
> > about this method. :)
> >
> > -Kevin
> >
> > -----Original Message-----
> > From: Omland Christopher m [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, March 26, 2002 2:45 PM
> > To: [EMAIL PROTECTED]
> > Cc: [EMAIL PROTECTED]
> > Subject: Re: [PHP] Loading Images
> >
> > I wasn't so much concearned about security of users grabbin pics. I am
> > more trying to learn how these people load there menus dynamically and
> > pics dynamically. Do you have any links to pages or code that describe
> > how
> > to make a link in the db to pics on my filesystem?
> > Thanks.
> > -Chris
> >
> > On Tue, 26 Mar 2002 [EMAIL PROTECTED] wrote:
> >
> >> At 26.03.2002 12:47, you wrote:
> >>>
> >>> I don't have any code for this, but I'm hoping someone can point me
> > in the
> >>> right direction. I want to load images or navigation menus
> > dynamically. Is
> >>> it possible to build a database of images and then use php to
> display
> >>> them? Or something along these lines. I know this must be possible,
> >>> becuase I see sites that do something like this, and I cant seem to
> > right
> >>> click the image and save it. Does this make any sense?
> >>> Thanks.
> >>> -Chris
> >> Storing images in a db is not a good idea. instead store them
> >> in your filesystem an have a reference to them in your db.
> >> Then you can make everything ;-)
> >>
> >> Even there´s no real security for grabbing pics. If your client can
> > see them,
> >> they are on his/her machine. To prevent the right-click, you have to
> > use
> >> JavaScript, but that only works, if the user has it switched on.
> >> A little more secure is putting the pics in flash-movies. But I think
> > there are
> >> already programs out, which allow to extract pictures and
> componenets.
> >> HTH Oliver
> >>
<?php
/*
Modified by [EMAIL PROTECTED], June 200
May 10, 2000.
Written and tested on PHP 4.0 RC1 (mod_php)
Linux/Apache. Tried on PHP 3.0.14 Win2000/IIS
5.0 for a minute or two, it worked.
==============================================================
This script is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Copyright (c)2000 Pierre Marceau. You may freely use
and redistribute under the terms of the GNU General Public
License.
--------------------------------------------------------------
gif2function - http://www.skynet.ca/~pierre/
==============================================================
This script converts gif files into PHP functions.
See example.php3. Use small gif files 2 or 3 kb
max. I use it for one 800 byte (0.8KB) background image
file.
*/
//$fname[1]['name'] = '/tmp/mozilla/*.gif';
//$fname[1]['ext'] = 'gif';
//$fname[2]['name'] = '/tmp/mozilla/*.png';
//$fname[2]['ext'] = 'png';
//$fname[3]['name'] = '/tmp/mozilla/*.jpg';
//$fname[3]['ext'] = 'jpg';
$fname[1]['name'] = '../img/*.gif';
$fname[1]['ext'] = 'gif';
$fname[2]['name'] = '../img/*.png';
$fname[2]['ext'] = 'png';
$fname[3]['name'] = '../img/*.jpg';
$fname[3]['ext'] = 'jpg';
$image_registry = array();
echo '<?php'."\n";
reset($fname);
while (list($fk,$fv)=each($fname)) {
$far = array();
$tstr = "find ".dirname($fv['name'])." -name '".basename($fv['name'])."' -print";
$tfp = popen($tstr,"r");
while (!feof($tfp)) {
$t = explode("\n",fgets($tfp,40960)); $t[0] = trim($t[0]);
if (strlen($t[0]) != 0 ) $far[] = $t[0];
}
pclose($tfp);
reset($far);
while (list($k,$v)=each($far)) {
$fsize = filesize($v);
if ($fsize>0) {
$new_func = "\n";
$new_name = 'image_'.str_replace('=','_',base64_encode($v));
$image_registry[$v] = $new_name.'();';
$content = $fv['ext'];
$fd = fopen($v,"r");
$contents = fread($fd,$fsize);
fclose($fd);
$b64 = base64_encode($contents);
$new_func .= " function $new_name() {\n";
$new_func .= " header(\"Content-type: image/${content}\");\n";
$new_func .= " header(\"Content-length: ${fsize}\");\n";
$new_func .= " echo base64_decode(\n '";
$new_func .= chunk_split($b64,905,"'.\n '");
$new_func = ereg_replace("'.\n '$","');\n }",$new_func);
$new_func .= "\n";
echo $new_func;
}
}
}
echo "\n";
echo '$image_registry=array();'."\n";
reset($image_registry);
while (list($k,$v)=each($image_registry)) echo
'$image_registry["'.$k.'"]="'.$v.'";'."\n";
echo 'if (!(isset($img))) {'."\n";
echo 'echo "<html><body><table border=1>";'."\n";
echo 'reset($image_registry);'."\n";
echo 'while (list($k,$v)=each($image_registry)) '."\n";
echo ' echo "<tr><td>$k</td><td><img
src=\"".$PHP_SELF."?img=".base64_encode($k)."\"></tr>\n"; '."\n";
echo 'echo "</table></body></html>";'."\n";
echo "} else { \n";
echo ' $f = $image_registry[base64_decode($img)]; '."\n";
echo ' eval($f); '."\n";
echo "} \n";
echo '?>'."\n";
?>
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