Windows Media Player 11 SDK IWMPNetwork.downloadProgress (VB and C#) 

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IWMPNetwork.downloadProgress (VB and C#)

The downloadProgress property gets the percentage of downloading completed.

Property Value

A System.Int32 that is the download progress expressed as a percentage.

Remarks

When the Windows Media Player control is connected to a digital media file that can be played and downloaded at the same time, the downloadProgress property gets the percentage of the total file that has been downloaded. This feature is currently supported only for digital media files downloaded from Web servers. A file of any of the following formats can be downloaded and played simultaneously:

• Advanced Systems Format (ASF)
• Windows Media Audio (WMA)
• Windows Media Video (WMV)
• MP3
• MPEG
• WAV

In addition, some AVI files can be downloaded and played simultaneously.

Use the AxWindowsMediaPlayer._WMPOCXEvents_BufferingEvent to determine when buffering starts or stops.

Example Code

The following code example uses downloadProgress to display the percentage of downloading completed. The information is displayed in a label, in response to the Buffering Event. The example uses a timer with a 1-second interval to update the display. The AxWMPLib.AxWindowsMediaPlayer object is represented by the variable named player.

' Create an event handler for the Buffering event.
Public Sub player_Buffering(ByVal sender As Object, ByVal e As AxWMPLib._WMPOCXEvents_BufferingEvent) Handles player.Buffering

    ' Test whether packets may be arriving.
    Select Case e.newState

    ' If WMPPlayState is Stopped, Paused, ScanForward, ScanReverse, Waiting, MediaEnded
    ' or Transitioning then stop the timer. 
        Case 1
        Case 2
        Case 4
        Case 5
        Case 7
        Case 8
        Case 9
            timer.Stop()

        ' If WMPPlayState is Playing or Buffering then set the timer interval and start the timer.
        Case Else
            timer.Interval = 1000
            timer.Start()

    End Select

End Sub

' Update the download progress in a timer event handler.
Public Sub UpdateDownloadProgress(ByVal sender As Object, ByVal e As System.EventArgs) Handles timer.Tick

    downloadProgressLabel.Text = ("Download progress: " + player.network.downloadProgress + " percent complete")

End Sub

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// Add a delegate for the Buffering event.
player.Buffering += new AxWMPLib._WMPOCXEvents_BufferingEventHandler(player_Buffering);

// Create an event handler for the Buffering event.
private void player_Buffering(object sender, AxWMPLib._WMPOCXEvents_BufferingEvent e)
{
    // Determine whether buffering has started or stopped.
    if (e.start == true)
    {
        // Set the timer interval at one second (1000 miliseconds).
        timer.Interval = 1000;
        
        // Start the timer.
        timer.Start();
    }
    else
    {
        // Buffering is complete. Stop the timer.
        timer.Stop();
    }
}

// Update the download progress in a timer event handler.
private void UpdateDownloadProgress(object sender, EventArgs e)
{
    downloadProgressLabel.Text = ("Download progress: " + player.network.downloadProgress + " percent complete");
}

Requirements

Version: Windows Media Player 9 Series or later

Namespace: WMPLib

Assembly: Interop.WMPLib.dll (automatically generated by Visual Studio)

See Also

• AxWindowsMediaPlayer.Buffering Event (VB and C#)
• IWMPNetwork Interface (VB and C#)

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