MIME type of a file

[ulthane]

im just wondering, since just checking the ext of a certain file is not enough
how can i check the mime type of an uploaded file to check if the file really is an image?

Thanks in advance,
Ulthane

[webber123456]

perhaps check for image dimensions to see if it really is an image

http://forums.aspfree.com/code-bank-...ns-196351.html

[ulthane]

tried to combine that code with the uploading form code i got atm but had no luck apperantly..keep getitng alot of different errors..

[webber123456]

you'll have to be a bit more specific if there is any expectation for help.

[ulthane]

i cannot really be more specific, i can just show u my current code and u'll help me combining the image deminsions check with it if u can

<!--#INCLUDE FILE="clsUpload.asp"-->
<%
Dim Upload
Dim FileName
Dim Folder

Set Upload = New clsUpload

FileName =LCase(Upload.Fields("File1").FileName)

If Right (FileName,4) = ".jpg" or Right (FileName,4) = ".bmp" or Right (FileName,4) = ".png" or Right (FileName,4) = ".gif" or Right (FileName,5) = ".jpeg" Then 
    If Upload("File1").Length < 512000 Then
  Folder = Server.MapPath("db") & "\" & ("Photos") & "\"

FileName = Upload.UniqueName(Folder, FileName)

Upload("File1").SaveAs Folder & FileName

Set Upload = Nothing

Response.Redirect ("gallery.html")
end if
end if 
%>

Those checks i got currently are just to limit the file size or checking for its ext, i need something more just to avoid pple from being able to upload fake files by just changing their ext from .txt to .jpg for example...

Thanks in advance,
Ulthane

[siteguru]

This is the Lewis Moten uploader class you are using - yes? He mentions in his website a method to determine if the uploaded file is an image, and what type.

Just search (Ctrl-F) in his site for Read Image Dimensions. In fact, I'd recommend you check out some of the other code snippets he has there.

[ulthane]

heh, i belive i deleted that asp file when i saw that i didnt use it, because i thought i wouldn't need to check for file deminsions, now i see how needed it is

Thanks, working.