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How to find the extension of a file?

Posted by: admin November 29, 2017 Leave a comment

Questions:

In my web application (asp.net,c#) I am uploading video file in a page but I want to upload only flv videos. How can I restrict when I upload other extension videos?

Answers:

Path.GetExtension

string myFilePath = @"C:\MyFile.txt";
string ext = Path.GetExtension(myFilePath);
// ext would be ".txt"

Questions:
Answers:

At the server you can check the MIME type, lookup flv mime type here or on google.

You should be checking that the mime type is

video/x-flv

If you were using a FileUpload in C# for instance, you could do

FileUpload.PostedFile.ContentType == "video/x-flv"

Questions:
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I’m not sure if this is what you want but:

Directory.GetFiles(@"c:\mydir", "*.flv");

Or:

Path.GetExtension(@"c:\test.flv")

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You may simply read the stream of a file

using (var target = new MemoryStream())
        {
            postedFile.InputStream.CopyTo(target);
            var array = target.ToArray();

First 5/6 indexes will tell you the file type. In case of FLV its

private static readonly byte[] FLV = { 70, 76, 86, 1, 5};

Just do - var isAllowed = array.Take(5).SequenceEqual(FLV);

if yes then its FLV.

OR

Read the content of a file

var contentArray = target.GetBuffer();
                var content = Encoding.ASCII.GetString(contentArray);

First two/three letters will tell you the file type. In case of FLV its

“FLV |\0\0\0\0\0\0 ……”

Just do - content.StartsWith("FLV")

Questions:
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You will not be able to restrict the file type that the user uploads at the client side[*]. You’ll only be able to do this at the server side. If a user uploads an incorrect file you will only be able to recognise that once the file is uploaded uploaded. There is no reliable and safe way to stop a user uploading whatever file format they want.

[*] yes, you can do all kinds of clever stuff to detect the file extension before starting the upload, but don’t rely on it. Someone will get around it and upload whatever they like sooner or later.

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You can check .flv signature. You can download specification here:

http://www.adobe.com/devnet/flv/

See “The FLV header” chapter.

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In addition, if you have a FileInfo fi, you can simply do:

string ext = fi.Extension;

and it’ll hold the extension of the file (note: it will include the ., so a result of the above could be: .jpg .txt, and so on….

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This solution also helps in cases of more than one extension like “Avishay.student.DB”

                FileInfo FileInf = new FileInfo(filePath);
                string strExtention = FileInf.Name.Replace(System.IO.Path.GetFileNameWithoutExtension(FileInf.Name), "");

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EndsWith()

Found an alternate solution over at DotNetPerls that I liked better because it doesn’t require you to specify a path. Here’s an example where I populated an array with the help of a custom method

        // This custom method takes a path 
        // and adds all files and folder names to the 'files' array
        string[] files = Utilities.FileList("C:\", "");
        // Then for each array item...
        foreach (string f in files)
        {
            // Here is the important line I used to ommit .DLL files:
            if (!f.EndsWith(".dll", StringComparison.Ordinal))
                // then populated a listBox with the array contents
                myListBox.Items.Add(f);
        }