How to identify the original file type and restrict the file uploading while using file upload control
Hi asp.net ,
I am uploading a file using FileUpload control in asp.net using vb.net.I wrote the code to upload only PDF files.
the user can change the extension and change to PDF .
I have to check is the file original PDF or not then i have to upload the PDF files only .
How to do this ??
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for1206
9/7/2008 11:04:59 AM
asp.net.web-forms
93655 articles. 
6 followers.
3 Replies
1998 Views
Hi, Check the file Mime type for "application/pdf" by looking at the:
FileUpload1.PostedFile.ContentType
Regards
Smcoxon
No Gem is ever polished without some friction.
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smcoxon
9/7/2008 7:02:02 PM
Hi smcoxon , Thanks For Replying ,But i found that there is no use using
PostedFile.ContentType="application/pdf" .It is also checking the extension is pdf or not ,Which can be done by client script.
For example , There is an mpg file . I am giving access to upload only pdf file in the application.
He can change the extension and send it as pdf file. Now the actual thing here is ,
I have to find the internal content whether it is orginally generated by PDF or not .then i have to upload the actual PDF file .
Thanks ,
for1206.
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for1206
9/8/2008 5:07:23 AM
Hi,
I think you need to upload to the server all files with an extension .PDF. Then on the server side, you can read the the first two bypes of the file because I test to prove that the first two bytes of all PDF files are identical, whereas a fake file with .pdf extension will be different with the first two bypes. Thereby by this we can determine a file whether or not is one of .pdf type.
The following is my testing code. Please refer to it:
System.IO.BinaryReader binReader = new System.IO.BinaryReader(filepath, System.IO.FileMode.Open)); byte[] testArray = new byte[2]; int count = binReader.Read(testArray, 0, 2); string str = null; if (count != 0) { str = binReader.ReadByte().ToString(); str = str + binReader.ReadByte().ToString() + binReader.ReadByte().ToString(); } // We can see the value of the first two bytes are identical. Response.Write(str); binReader.Close();
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ASPNetEngineer
9/13/2008 8:07:36 AM
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