Showing progress after every percent for file download using backgroundtransfer

Question

I am showing thumbnail for magazines in a list and added a download button for each magazine. One can download the magazine by clicking on download button. I want to show a label which will show the progress after every percent i.e 1%, 2%,3% so on... and that too for each magazine separately. how can I acheive this?

I was looking at Background Transfer sample  provided in the samples but I guess it shows the % after a certain time. How can I change it to show the progress % as I want?

Answer 1

Hi,

I think you can use HttpClient for this. Reference  - http://social.msdn.microsoft.com/Forums/da-DK/winappswithcsharp/thread/9814a5b9-0135-4fb2-b21c-461e5a3fb413

-Sagar

Answer 2

Hi,

We’ve been discussing our original answer here, and have a new recommendation.  Background Downloader gives you a substantial amount of functionality with a very straightforward API.  HttpClient is a lower-level API; it can potentially do exactly what you want to achieve, but you’ll need to do more work to fit it to your program. Considering what needs to be achieved – I think Background Downloader seems to be a good option from a performance and coding time perspective with a trade-off for displaying % downloaded intervals.

-Sagar

Answer 3

Sagar

Sorry for delayed reply , got busy with other things.

Good to know that I am on the right track but my query still remain the same. How can I shorten the time for the callback loop and also If there are multiple downloads and progress bar for each download, which event handler I will need to invoke to update the progress value on each progress bar?

Answer 4

private void DownloadProgress(DownloadOperation download)
        {
            MarshalLog(String.Format("Progress: {0}, Status: {1}", download.Guid, download.Progress.Status));

            double percent = 100;
            if (download.Progress.TotalBytesToReceive > 0)
            {
                percent = download.Progress.BytesReceived * 100 / download.Progress.TotalBytesToReceive;
            }

            MarshalLog(String.Format(" - Transfered bytes: {0} of {1}, {2}%",
                download.Progress.BytesReceived, download.Progress.TotalBytesToReceive, percent));

            if (download.Progress.HasRestarted)
            {
                MarshalLog(" - Download restarted");
            }

            if (download.Progress.HasResponseChanged)
            {
                // We've received new response headers from the server.
                MarshalLog(" - Response updated; Header count: " + download.GetResponseInformation().Headers.Count);

                // If you want to stream the response data this is a good time to start.
                // download.GetResultStreamAt(0);
            }
        }

private void MarshalLog(string value)
        {
            var ignore = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                Log(value);
            });
        }

        private void Log(string message)
        {
            textBlock.Text += message + "\r\n";
        }