Buffer 40MB or larger files does not work

Hi

I have this code: what it does is it loads a mp3 file into memory, (using jwplayer), with small files (under 7mb) I can skip forward or move back. But when I load a 40mb file it look like it has to load the whole file into memory. So I cant move forward or back (user exp sucks).

Does anyone know how to get this to work?


public static void ResumableFile(string filename, string fullpath, string contentType)
    {
        System.IO.Stream iStream = null;

        // Buffer to read 10K bytes in chunk:
        byte[] buffer = new Byte[10000];

        int length;
        
        try
        {
            FileStream myFile = new FileStream(fullpath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            BinaryReader br = new BinaryReader(myFile);
            try
            {
                iStream = new System.IO.FileStream(fullpath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);          
                
                HttpContext.Current.Response.AddHeader("Accept-Ranges", "bytes");
                HttpContext.Current.Response.Buffer = false;

                // Total bytes to read:
                long fileLength = myFile.Length;
                
                long startBytes = 0;

                //int pack = 10240; //10K bytes


                int pack = 1048576; //1024K bytes

                if (HttpContext.Current.Request.Headers["Range"] != null)
                {
                    HttpContext.Current.Response.StatusCode = 206;
                    string[] range = HttpContext.Current.Request.Headers["Range"].Split(new char[] { '=', '-' });
                    startBytes = Convert.ToInt64(range[1]);
                }
                HttpContext.Current.Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
                if (startBytes != 0)
                {
                    HttpContext.Current.Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength));
                }
                HttpContext.Current.Response.AddHeader("Connection", "Keep-Alive");
                HttpContext.Current.Response.ContentType = contentType;
                //HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));

                br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                int maxCount = (int)Math.Floor((double)((fileLength - startBytes) / pack)) + 1;

                // Read the bytes.
                while (fileLength > 0)
                {
                    // Verify that the client is connected.
                    if (HttpContext.Current.Response.IsClientConnected)
                    {
                        // Read the data in buffer.
                        length = iStream.Read(buffer, 0, 10000);

                        // Write the data to the current output stream.
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);

                        // Flush the data to the HTML output.
                        HttpContext.Current.Response.Flush();

                        buffer = new Byte[10000];
                        fileLength = fileLength - length;
                    }
                    else
                    {
                        //prevent infinite loop if user disconnects
                        fileLength = -1;
                    }
                }
            }
            catch
            {
                HttpContext.Current.Response.ContentType = "text/html";
                HttpContext.Current.Response.Write("Error : file not found");
            }
            finally
            {
                br.Close();
                myFile.Close();
            }
        }
        catch
        {
            HttpContext.Current.Response.ContentType = "text/html";
            HttpContext.Current.Response.Write("Error : file not found");
        }
    }

Open in new window

mousemat24Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

AndyAinscowFreelance programmer / ConsultantCommented:
>>But when I load a 40mb file it look like it has to load the whole file into memory.

Correct - that is what you have coded (read the file in the while loop).

>>Does anyone know how to get this to work?

Yes - don't use the while loop, read the first buffer load then read only when it is required.  (Maybe you should read the file in a thread)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
mousemat24Author Commented:
AndyAinscow, dont suppose you can send me the code? Many thanks
0
AndyAinscowFreelance programmer / ConsultantCommented:
It is basically what you currently have - just remove the while loop and keep track of how much you have read from the file.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.