Well, I've done a lot of web searching, and a lot of experimentation, but
haven't hit upon a fix for my issue yet.
Currently, images are served on a site I'm working on in two ways:
1) Free Images are served normally (<img src="freepic.jpg">).
2) Non-Free Images are served through a PHP wrapper with authentication
functionality in it (<img src="showpicture.php?pid=111384">).
The issues I'm having *only* occur in Internet Explorer, but it's not the
full-cache issue that Microsoft acknowledges, and I don't honestly believe
it to be a total bug in IE, since the free images, served up through a
normal <img> tag work fine.
The issue is that, if the user right-clicks the image, and chooses "Save
As", it will only save as a BMP. Interestingly, if the user right-clicks on
a link to a picture, and chooses "save target as", it works just fine.
So far, I've tried the following, with no success:
1) Mod-Rewrite, rewriting a request of /secure/111384.img to
/showpicture.php?pid=111384. I did this because it was suggested that IE
might be looking at the file name in the link, not seeing an image type, and
therefore defaulting to bmp. The rewrite works successfully, and the
picture is shown, but the "save as" function still doesn't work. Getting
the image properties from within IE gives a Type of "Not Available".
2) Adding, rewriting, subtracting, etc, many many header combinations.
3) All Microsoft-suggested full-cache problem fixes, just in case.
So, the scripts involved are these:
in functions.php:
function showpix($picture_id)
{
$sql="SELECT ug.group_name, p.name from usenet_groups as ug,
ipictures as
p WHERE p.id='$picture_id' AND ug.id=p.group_id";
$result=mysql_query($sql) or die(mysql_error());
$row=mysql_fetch_array($result);
$dirhash=get_storage_dir($row["name"]);
$picturedirectory=STORAGEDIR."/".$row["group_name"];
$fullpicturename=$picturedirectory."/".$dirhash."/".$row["name"];
header("Content-Type: image/jpeg");
header("Content-Length: ".(string)filesize($fullpicturename));
header("Content-Disposition: inline;
filename=\"".$row["name"]."\"");
readfile("$fullpicturename");
return(true);
}
The page serving the image:
<tr><td><a href="/secure/<?=$row["id"]?>.jpg" target="_BLANK">
<img src="showpicture.php?type=thumb&pid=<?=$row["id"]?>"><br>
<?=$row["name"]."<br>".$row["date_added"]?></a>
<?php if($_SESSION["sec_level"]==4)
{
echo "<br><img onClick=\"rethumbnail({$row["id"]});\"
src=\"/graphics/rethumbnail.png\">".SPACER.
"<img onClick=\"del_picture({$row["id"]});\"
src=\"/graphics/trashcan.png\">";
}
?>
</td>
showpicture.php:
<?php
include('dbconnect.php');
include('defines.php');
include('functions.php');
if($_GET["type"]=="temp"||$_GET["type"]=="thumbtemp")
{
$sec_level=4;
}
else
{
$sec_level=2;
}
include('validate_user.php');
switch($_GET["type"])
{
case "thumb":
{
showthumb($_GET["pid"]);
break;
}
case "temp":
{
showpixtemp($_GET["pname"], $_GET["gid"]);
break;
}
case "thumbtemp":
{
showthumbtemp($_GET["pname"], $_GET["gid"]);
break;
}
default:
{
showpix($_GET["pid"]);
}
}
?>
Because of the fact that IE can properly determine the image type when
statically served, I have to believe that something is not being sent
properly to the browser from within one of these functions.
I apologize for asking this question twice, but having done more research,
and having unsuccesfully implemented the suggestions given to me last time,
I'm hoping that someone can point me in the right direction, before I'm
simply forced to do Apache redirection, which isn't as good as actually
checking in the session for logged-in status.
Thanks in advance for anything you can throw my way.
Bob
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