How to prevent the user uploading corrupted or damaged files?

  • Thread starter Thread starter muthu
  • Start date Start date
M

muthu

Hi,
User will upload only picture and pdf files. I have return a asp.net
application for that,But thing is I need to restrict the user
uploading corrupted or damaged files.
Can anyone have any idea?
 
Hello muthu,

You need to intro either the ActiveX control which will validated the file
format (google for "image validator") or do it on server side.
But I don't think that it's very easy task.


---
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"The greatest danger for most of us is not that our aim is too high and we
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m> Hi,
m> User will upload only picture and pdf files. I have return a asp.net
m> application for that,But thing is I need to restrict the user
m> uploading corrupted or damaged files.
m> Can anyone have any idea
 
AFAIK, no built-in way. One crude option is to take the image stream on the
server-side and try loading into an Image class (as in
System.Drawing.Image.FromStream(Request.Files[0].InputStream)) and see if it
throws ArgumentException. If it does, the uploaded file is not an image.

Not sure how to do for PDF files.
 
Thanks for your valuable reply,
I am looking for some otherway.
AFAIK, no built-in way. One crude option is to take the image stream on the
server-side and try loading into an Image class (as in
System.Drawing.Image.FromStream(Request.Files[0].InputStream)) and see if it
throws ArgumentException. If it does, the uploaded file is not an image.

Not sure how to do for PDF files.



muthu said:
Hi,
User will upload only picture and pdf files. I have return a asp.net
application for that,But thing is I need to restrict the user
uploading corrupted or damaged files.
Can anyone have any idea?- Hide quoted text -
Click to expand...

- Show quoted text -
Click to expand...
 
most anti-virus vendors sell a toolkit with an api you can use to do this.

-- bruce (sqlwork.com)
 
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