Date parsed: 07/10/2007 12:41:19
Date: Sun, 7 Oct 2007 10:41:19 +0200

Are you saying you are saving the image in a file? This is unnecessary. The
standard way of serving database images is making a special page
GetImage.aspx that will get images from the database and stream them down
top the client in the http response. The image url will look like
"GetImage.aspx?id=xxx"/

--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net


"Rob" <rob_nicholson@nospam_unforgettable.com> wrote in message
news:1dUNi.3630$WX3.900@newsfe5-win.ntli.net...
> Do browsers determine the type of a file by either looking at it's
> contents or it's file name when parsing an IMG tag? IE7 can be asked to
> display "Photo.tmp" which is actually a JPG and it displays it correct.
>
> Just worried that other browsers may to it a different way.
>
> The reason it's called TMP is that the file is coming out of a SQL IMAGE
> field and I don't have the original file name to hand.
>
> Cheers< Rob.
>

Date parsed: 08/10/2007 12:49:44
Date: Mon, 8 Oct 2007 10:49:44 +0200

> The image is saved in a database. Imagine a gallery of photos like on
> facebook. The application extracts the image from the database, writes it
> into a file and then generates IMG tags to point to the download files.
>
> It has to work this way - the generated pages are static, only updated
> periodically.
Still the standard solution looks better to me. There is absolutely no
advantages in using files. You have to take care of deleting them, of file
naming, of scalability.

>
> So an IMG tag has to be used - the question is how to, with an IMG tag,
> does the browser work out what type of file it is? Does it a) look and the
> extension or b) look at the file header.
b)

>
> And if (b) is that true for all browsers?
To be 100% sure, you need to investigate about every browser separately.
For Mozilla this source
http://developer.mozilla.org/en/docs/How_Mozilla_determines_MIME_Types says:
....for images loaded via <img src>, Mozilla's image library will do content
sniffing (never extension sniffing) to find out the real type of the image.

Look also in this: HTTP content-type and browser support
http://www.byteflex.co.uk/http_content_type_and_browser_support.html


--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net


>
> Cheers, Rob.
>