Uploading Image-Image only should accept

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Hi,

file input type i wants to upload only image

i have written code

if (hpf.ContentType.ToLower() != "image/pjpeg" && hpf.ContentType.ToLower() != "image/x-png" && hpf.ContentType.ToLower() != "image/gif" && hpf.ContentType.ToLower() != "image/bmp" && hpf.ContentType.ToLower() != "image/jpg" && hpf.ContentType.ToLower() != "image/png" && hpf.ContentType.ToLower() != "image/jpeg")

its working fine even when user tries to rename PDF or excel as jpg also in IE8 its not allowing to upload

But problem is when they use chrome browser PDF file they rename it as JPG its accepting and gets upload :(

How to solve this ?

Posted 4-Jul-12 1:37am

kimberly wind

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Pankaj Nikam · Answer 1 · 2012-07-04T04:57:00

Solution 1

You can inspect the first few bytes to get the actual file type.

Check the following link which has some commonly used file types:
http://www.garykessler.net/library/file_sigs.html[^]

You can then match those bytes with the one uploaded.

Posted 4-Jul-12 4:57am

Pankaj Nikam