CODEWITHSUNDEEP
c#asp.net
user1166905
user1166905

Reputation: 2622

Create ASP.Net Handler to return Image as Bytes

I am looking at creating a handler to return images based on id passed through, I haven't created my own one before and when I created it it mentions that it has to be registered with IIS. This project is distributed to a lot of clients, will I have to change each one's IIS or is there some way round this or an alternative to a handler?

EDIT: In response to below, this is what I have created (but not yet tested), so will I need to change anything in IIS or web.config for this?

public class Photos : IHttpHandler
{
    #region IHttpHandler Members

    public bool IsReusable
    {
        get { return true; }
    }

    public void ProcessRequest(HttpContext context)
    {
        //write your handler implementation here.
        var img = Image.FromFile(@"C:\Projects\etc\logo.jpg");
        context.Response.ContentType = "image/jpeg";
        img.Save(context.Response.OutputStream, ImageFormat.Jpeg);
    }

    #endregion
}

Upvotes: 6

Views: 6946

Answers (4)

Mikael Engver
Mikael Engver

Reputation: 4768

You can look at this blogpost about Handlers, http://www.dotnetperls.com/ashx, which I think is pretty close to what you want to do.

Upvotes: 1

bdn02
bdn02

Reputation: 1500

The httphandlers are registered in web.config of website, if you distribute the config file with website you don't need to change iis configuration

Upvotes: 0

Dave Zych
Dave Zych

Reputation: 21887

You can create a class that inherits IHttpHandler and within that grab the id (from the querystring or similar), process the request and return the binary data. Shouldn't have to register it with IIS...

public class MyHandler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        //Get Id from somewhere

        //Get binary data

        context.Response.ContentType = "application/octet-stream";
        context.Response.BinaryWrite(bytes);
    }
}

Upvotes: 9

w5l
w5l

Reputation: 5746

You can add a generic handler to your project (a .ashx file). It will give you a file with a codebehind as follows (excerpt):

public void ProcessRequest(HttpContext context)
{
    context.Response.ContentType = "text/plain";
    context.Response.Write("Hello World");
}

You can use the context to get query string or route parameters, and the context.Response property to write your image. Change the returned content type to your image content type, and you're set.

You would set your image src to: "Handler1.ashx?id=12345", or you could add a pretty url route pointing to the handler.

No need to configure IIS for this.

Upvotes: 4

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