Hosting and Streaming

Re: Re: Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

kkdhf — Sat, 27 Jun 2009 08:04:49 GMT

in fact , i tried to return Image Bytes to response stream , but always failed at client. i think ,maybe IIS give a 404 error before i rewrite the image path. at last, i add javascript code at every place needed. ... ...

Re: Re: Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

tranduybien — Mon, 15 Jun 2009 08:56:25 GMT

Try to check with :

            try
            {
                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ImageUrl);
                request.Timeout = 5000; // 5 seconds in milliseconds
                request.ReadWriteTimeout = 20000; // allow up to 20 seconds to elapse
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                return response.GetResponseStream();
            }
            catch
            {
                return null;
            }

Re: Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

kkdhf — Mon, 15 Jun 2009 08:31:21 GMT

in fact , IsIMG is follow:

private bool IsIMG(string url)
        {
            url = url.ToLower();
            string con = "(.gif|.bmp|.png|.jpg|.jpeg)$";
            Regex regex = new Regex(con);
            return regex.IsMatch(url);
        }

and it seems filter other link.

Re: Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

tranduybien — Mon, 15 Jun 2009 08:26:19 GMT

try this one: if (context.Request.Url.LocalPath.ToUpterCase().EndsWith("NOIMAGE.JPG") == false)

MessageBox.Show(context.Request.Url.LocalPath); to check valid link

Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

kkdhf — Mon, 15 Jun 2009 08:13:03 GMT

i have added try catch block,and catch nothing.seems it not occurs any exception.

and i use rewritepath("~/noimage.jpg"), i think it will works right , i often used it like this.

i have another module in the same website, it used it , works fine.

hope your reply . :)

Re: Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

tranduybien — Mon, 15 Jun 2009 08:05:09 GMT

Check UriKind and change to UriKind.RelativeOrAbsolute in IsIMG function

Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

tranduybien — Mon, 15 Jun 2009 08:01:36 GMT

using try catch then MessageBox your error :)

Re: why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

kkdhf — Mon, 15 Jun 2009 07:59:22 GMT

...may be i should say more clear. i want to rewrite image path if the server doesn't exist the image.

and the result is when i debug it . it can get a right image if it's not exist.

but at server , seems it passed my code, but nothing happend.

what makes it not works at server? what should i do to make it works like what i want?

can u help me?

why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

kkdhf — Mon, 15 Jun 2009 07:47:21 GMT

why my httpmodule rewrite iamge path wroks right at debug, but failed after published?

follow is the code:

   public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        void context_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context;
            if (IsIMG(context.Request.Url.LocalPath) == true)
            {
                if (context.Request.Url.LocalPath.EndsWith("NoImage.jpg") == false)
                {
                    if (File.Exists(context.Server.MapPath(context.Request.Url.LocalPath)) == false)
                    {
                        context.RewritePath("~/NoImage.jpg");
                    }
                }
            }
        }