Embedding the Windows Media Player Control in a Visual Basic .NET Solution

To use the functionality of Windows Media Player 9 Series or later in a Visual Basic .NET application, first add the component to a form as described in Using the Windows Media Player Control with Microsoft Visual Studio

This section describes how to create an application that plays video and has custom play and stop buttons.

Add the Video Window

Add the Windows Media Player control to a form. Resize the control, and then place it where you want the video window to appear.

Select the Windows Media Player control, then change the uiMode property to "none". This setting hides the UI controls. When the user plays a video, it will appear in the window. For audio-only content, a visualization will appear.

Add Two Buttons and Adjust the Form

Now add two buttons to the form. Select the first button and change the Text property to "Play". Select the second button and change its Text property to "Stop".

Add the Play Code

Double-click the Play button to reveal the Code window. The following code is displayed:



Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

End Sub


Add this line to the subroutine:



AxWindowsMediaPlayer1.URL = "c:\mediafile.wmv"


In the preceding code example, "axWindowsMediaPlayer1" is the default name of the Windows Media Player control and "c:\mediafile.wmv" is a placeholder for the name of the media you want to play.

If you have added the digital media content from the Windows Media Player SDK to the library in Windows Media Player, you can use this code instead:



axWindowsMediaPlayer1.currentPlaylist = _
    axWindowsMediaPlayer1.mediaCollection.getByName("mediafile")



Because the autoStart property is true by default, Windows Media Player will start playing when you set the currentPlaylist or URL property.

Add the Stop Code

Double-click the Stop button to reveal the Code window. The following code is displayed:



Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

End Sub



Add this line to the subroutine:



AxWindowsMediaPlayer1.Ctlcontrols.stop()



Note  The managed-code wrapper for the Windows Media Player control exposes the Controls object as Ctlcontrols to avoid collision with the Controls property inherited from System.Windows.Forms.Control.
 

Add Error-handling

The Windows Media Player control does not raise an exception when it encounters an error such as an invalid URL. Instead, the control signals an event. Your application should handle error events sent by the Player.

To create an event handler, open the code window for your form class. From the drop-down list at the top of the window, select the Windows Media Player control. A list of events appears in the drop-down list to the right. From that list, select MediaError. The following code is displayed:



Private Sub AxWindowsMediaPlayer1_MediaError(ByVal sender As Object, _
    ByVal e As _WMPOCXEvents_MediaErrorEvent) Handles AxWindowsMediaPlayer1.MediaError

End Sub



The following code could be inserted in the subroutine to provide minimal error-handling capability. Note that information about the error can be retrieved from the _WMPOCXEvents_MediaErrorEvent argument.



Try
    ' If the file is corrupt or missing, show the 
    ' hexadecimal error code and URL.
    Dim errSource As WMPLib.IWMPMedia2 = e.pMediaObject
    Dim errorItem As WMPLib.IWMPErrorItem = errSource.Error
    MessageBox.Show("Media error " + errorItem.errorCode.ToString("X") _
                    + " in " + errSource.sourceURL)
Catch ex As InvalidCastException
    ' In case pMediaObject is not an IWMPMedia item.
    MessageBox.Show("Player error.")
End Try



Related topics

Embedding the Windows Media Player Control in a .NET Framework Solution

 

 

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