Handler (MIME) for multimedia content not working

Question

I am working with a handler that presents multimedia content in a page.

The idea is that this handler access the file and determine the type using the extension, and presenting it, the problem is that most of the times the handler itself gets downloaded and the multimedia is not presented.

Here is the code:

FileInfo file = new FileInfo(filePath);
byte[] bytes = new byte[file.Length];
using (FileStream fs = file.OpenRead())
{
    fs.Read(bytes, 0, bytes.Length);
}

string extension = Path.GetExtension(filePath);
string mimeDeclaration;
if (".tif" == extension)
    mimeDeclaration = "tiff";
string[] imagenes = new string[] {".jpg", ".jpeg", ".bmp", ".gif", ".png"};
if (imagenes.Any(x => x.Contains(extension)))
    mimeDeclaration = extension.Substring(1);
else
    mimeDeclaration = string.Empty;

context.Response.ClearContent();
context.Response.ClearHeaders();
context.Response.ContentType = "image/" + mimeDeclaration;
context.Response.BinaryWrite(bytes);

The filePath variable is valid.

Could you help me avoid the handler not to present the multimedia content?

What is the "Unexpected action"? – Bauss Jul 23 '15 at 12:56 — Bauss, Jul 23 '15 at 12:56
the problem is that the handler.cs gets downloaded – DanielV Jul 23 '15 at 13:02 — DanielV, Jul 23 '15 at 13:02
Check `filePath` perhaps it's the wrong file. – Bauss Jul 23 '15 at 13:05 — Bauss, Jul 23 '15 at 13:05
@Bauss unfortunately that is not the case :( – DanielV Jul 23 '15 at 13:14 — DanielV, Jul 23 '15 at 13:14

score 2 · Accepted Answer · edited May 23 '17 at 12:29

2

I think I get it now, when mimeDeclaration is empty or WRONG then you don't get the image download.

This occurs in your code because mime types for images aren't always "image/" plus the file extension:

context.Response.ContentType = "image/" + mimeDeclaration;

Eg for a .jpg image it's

image/jpeg

Otherwise it's probably because it's a tiff image in that case your else clause is setting mimeDeclaration back to an empty string.

Tip: detecting MIME types by file extension is less than ideal, check the way I do it here: Alternative to FindMimeFromData method in Urlmon.dll one which has more MIME types

edited May 23 '17 at 12:29

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answered Jul 23 '15 at 14:24

Jeremy Thompson

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Actually there is no case of not receiving an image, because in case of a video there is another path to handle it. – DanielV Jul 23 '15 at 14:57
But if you want a jpg it won't get served up properly because **image/jpg** is not the correct mime type. The correct mime type for a jpg is **image/jpeg** – Jeremy Thompson Jul 23 '15 at 15:03
@DanielV I trust you've tested this solution. Did it help you to solve the problem? Do you need any further assistance? – Jeremy Thompson Jul 24 '15 at 14:14
1

This [MIME class](http://stackoverflow.com/a/7161265/1257607) helped me improve the code. – DanielV Jul 25 '15 at 09:48
Meh, that's crap compared to Winista's binary analysis. – Jeremy Thompson Jul 25 '15 at 09:50
yes I agree, but this is an academic project to be delivered ASAP, means to an end.. – DanielV Jul 25 '15 at 09:58

Handler (MIME) for multimedia content not working

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