AxWindowsMediaPlayer 对象的 PlayStateChange 事件

[与此页面关联的功能（Windows 媒体播放器 SDK）是旧版功能。 它已被 MediaPlayer 取代。 MediaPlayer 已针对Windows 10和Windows 11进行了优化。 Microsoft 强烈建议新代码尽可能使用 MediaPlayer 而不是 Windows 媒体播放器 SDK。 如果可能，Microsoft 建议重写使用旧 API 的现有代码以使用新 API。]

当Windows 媒体播放器控件的播放状态更改时，将发生 PlayStateChange 事件。

[C#]
private void player_PlayStateChange(
  object sender,
  _WMPOCXEvents_PlayStateChangeEvent e
)

[Visual Basic]
 Private Sub player_PlayStateChange(   
 sender As Object,  
 e As _WMPOCXEvents_PlayStateChangeEvent 
 ) Handles player.PlayStateChange
 

事件数据

与此事件关联的处理程序的类型为 AxWMPLib._WMPOCXEvents_PlayStateChangeEventHandler。 此处理程序接收 AxWMPLib._WMPOCXEvents_PlayStateChangeEvent 类型的参数，其中包含与此事件相关的以下属性。

属性	说明
newState	System.Int32 指定新状态。

备注

Windows 媒体播放器状态不保证按任何特定顺序发生。 此外，并非每个状态都必然在一系列事件期间发生。 不应编写依赖于状态顺序的代码。

示例

以下示例演示了在标签中显示当前播放状态的 PlayStateChange 事件的事件处理程序。 AxWMPLib.AxWindowsMediaPlayer 对象由名为 player 的变量表示。

// Add a delegate for the PlayStateChange event.
player.PlayStateChange += new AxWMPLib._WMPOCXEvents_PlayStateChangeEventHandler(player_PlayStateChange);

private void player_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
{
    // Test the current state of the player and display a message for each state.
    switch (e.newState)
    {
        case 0:    // Undefined
            currentStateLabel.Text = "Undefined";
            break;

        case 1:    // Stopped
            currentStateLabel.Text = "Stopped";
            break;

        case 2:    // Paused
            currentStateLabel.Text = "Paused";
            break;

        case 3:    // Playing
            currentStateLabel.Text = "Playing";
            break;

        case 4:    // ScanForward
            currentStateLabel.Text = "ScanForward";
            break;

        case 5:    // ScanReverse
            currentStateLabel.Text = "ScanReverse";
            break;

        case 6:    // Buffering
            currentStateLabel.Text = "Buffering";
            break;

        case 7:    // Waiting
            currentStateLabel.Text = "Waiting";
            break;

        case 8:    // MediaEnded
            currentStateLabel.Text = "MediaEnded";
            break;

        case 9:    // Transitioning
            currentStateLabel.Text = "Transitioning";
            break;

        case 10:   // Ready
            currentStateLabel.Text = "Ready";
            break;

        case 11:   // Reconnecting
            currentStateLabel.Text = "Reconnecting";
            break;

        case 12:   // Last
            currentStateLabel.Text = "Last";
            break;

        default:
            currentStateLabel.Text = ("Unknown State: " + e.newState.ToString());
            break;
    }
}

Public Sub player_PlayStateChange(ByVal sender As Object, ByVal e As AxWMPLib._WMPOCXEvents_PlayStateChangeEvent) Handles player.PlayStateChange

    ' Test the current state of the player, display a message for each state.
    Select Case e.newState

        Case 0 ' Undefined
            currentStateLabel.Text = "Undefined"

        Case 1 ' Stopped
            currentStateLabel.Text = "Stopped"

        Case 2 ' Paused
            currentStateLabel.Text = "Paused"

        Case 3 ' Playing
            currentStateLabel.Text = "Playing"

        Case 4 ' ScanForward
            currentStateLabel.Text = "ScanForward"

        Case 5 ' ScanReverse
            currentStateLabel.Text = "ScanReverse"

        Case 6 ' Buffering
            currentStateLabel.Text = "Buffering"

        Case 7 ' Waiting
            currentStateLabel.Text = "Waiting"

        Case 8 ' MediaEnded
            currentStateLabel.Text = "MediaEnded"

        Case 9 ' Transitioning
            currentStateLabel.Text = "Transitioning"

        Case 10 ' Ready
            currentStateLabel.Text = "Ready"

        Case 11 ' Reconnecting
            currentStateLabel.Text = "Reconnecting"

        Case 12 ' Last
            currentStateLabel.Text = "Last"

        Case Else
            currentStateLabel.Text = ("Unknown State: " + e.newState.ToString())

    End Select

End Sub

要求

要求	值
版本	Windows 媒体播放器 9 系列或更高版本
命名空间	AxWMPLib
程序集	AxInterop.WMPLib.dll (AxInterop.WMPLib.dll.dll)

另请参阅

AxWindowsMediaPlayer 对象 (VB 和 C#)

AxWindowsMediaPlayer.playState (VB 和 C#)