Only allow specific file types to be uploaded?

I have a form using an input field to upload an image via CFFILE

the code is like this
<input name="picture" type="file" class="file" id="picture" size="35" value="#url.uploadedfile#" />

How can I use CF to validate that only the requested file types are allowed to be uploaded? I want to limit it to jpg/gif/jpeg ...  

do I do it in the form field, or in the <cffile> function?
what is the syntax?
MichaelEvangelistaAsked:
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PluckaConnect With a Mentor Commented:
MichaelEvangelista,

Use the <cffile accept paramater ie

<cffile action="upload" accept="image/jpg, image/gif, image/jpeg"

Regards
Plucka
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MichaelEvangelistaAuthor Commented:
PERFECT, thanks!

I will accept this answer but I do have  a Part II:
if I try to upload a foreign file type, now I get this error::

//////////////
 The MIME type of the uploaded file "application/octet-stream" was not accepted by the server.

Only files of type "image/jpg, image/gif, image/jpeg" can be uploaded.
Verify that you are uploading a file of the appropriate type.
////////////
Plus the big long eror message, etc.

My upload form already has an error message for the image processing part.
I.e. before adding this code I 'could' upload a foreign file type, but would get a nice formatted error message saying it could not be processed.

Now that I am stopping it from being uploaded in the first place,
I would like to somehow connect to that same error message.

It is called with

<cfcase value="notanimage">
<cfset userMessage = "File unable to be processed.<br>(Could be corrupt or using unknown compression.)<br>Please upload a valid picture file (jpg, gif, png.)" />
<cfset userMessageType = "notice" />
</cfcase>

How can I cause rejection of the filetype by the CFFILE accept parameter
to return to the page with that CFCASE set, rather than throwing the default CF error for the wrong file type?

I will gladly add points to this discussion... or however that works... let me know...


** Is there some way I can "catch" this error and
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PluckaCommented:
Yes use try/catch block

<cftry>
    <cffile action="upload"

    <cfcatch type="any">
        An error occured
    </cfcatch>
</cftry>
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MichaelEvangelistaAuthor Commented:
PERFECT !!! Thanks so much!
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