Handler (MIME) for multimedia content not working

问题

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?

回答1:

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

来源：https://stackoverflow.com/questions/31588006/handler-mime-for-multimedia-content-not-working

标签

handler

mime-types

mime