IWMPPlaylist::attributeCount property

[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The attributeCount property gets the number of attributes associated with a playlist.

Syntax

public System.Int32 attributeCount {get; set;}

Public ReadOnly Property attributeCount As System.Int32

Property value

A System.Int32 that is the number of attributes associated with the playlist.

Remarks

Because playlists can come from many different sources, they can have several different sets of attributes. This property gets the total number of attributes associated with a particular playlist so that other members of the IWMPPlaylist interface can access them.

Before using this property, you must have read access to the library. For more information, see Library Access.

For more information about attributes supported by Windows Media Player, see the Attribute Reference.

Examples

The following example illustrates how various properties and methods of the IWMPPlaylist and IWMPMedia interfaces are used by filling a treeview control with nodes for the current playlist, playlist attributes, media items in the playlist, and media item attributes. The AxWMPLib.AxWindowsMediaPlayer object is represented by the variable named player.

WMPLib.IWMPPlaylist playlist = player.currentPlaylist;
WMPLib.IWMPMedia media;
string name;

// Demonstrates setItemInfo()
playlist.setItemInfo("custom playlist attribute", "changed");
playlist.get_Item(0).setItemInfo("new custom attribute", "5");

// Create a tree node for each playlist attribute and a subnode for the item info of that attribute.
System.Windows.Forms.TreeNode playlistRootNode = new System.Windows.Forms.TreeNode("Playlist Attributes");

for (int i = 0; i < playlist.attributeCount; ++i)
{
    // Add a tree node for each playlist attribute.
    string attribute = playlist.get_attributeName(i);
    playlistRootNode.Nodes.Add(new System.Windows.Forms.TreeNode(attribute));

    // Add a subnode for the item info for that attribute.
    string info = playlist.getItemInfo(attribute);
    playlistRootNode.Nodes[i].Nodes.Add(new System.Windows.Forms.TreeNode(info));
}

// Add the playlist root node to the tree
displayAttributes.Nodes.Add(playlistRootNode);

// Add nodes for each media item and subnodes for each attribute of that item.
System.Windows.Forms.TreeNode mediaRootNode = new System.Windows.Forms.TreeNode("Media Items in the Playlist");
for(int i = 0; i < playlist.count; i++)
{
    // Get the media item
    media = playlist.get_Item(i);

    // Add a tree node for each media item in the playlist.
    mediaRootNode.Nodes.Add(new System.Windows.Forms.TreeNode(media.name));

    // Add a child node for each attribute of the media item
    for(int j = 0; j < media.attributeCount; j++)
    {
        name = media.getAttributeName(j);
        mediaRootNode.Nodes[i].Nodes.Add(new System.Windows.Forms.TreeNode(name + ": " + media.getItemInfo(name)));
    }
}

// Add the media root node to the tree
displayAttributes.Nodes.Add(mediaRootNode);

Dim playlist As WMPLib.IWMPPlaylist = player.currentPlaylist
Dim Media As WMPLib.IWMPMedia
Dim name As String

' Demonstrates setItemInfo()
playlist.setItemInfo("custom playlist attribute", "changed")
playlist.Item(0).setItemInfo("new custom attribute", "5")

' Create a tree node for each playlist attribute and a subnode for the item info of that attribute.
Dim playlistRootNode As System.Windows.Forms.TreeNode = New System.Windows.Forms.TreeNode("Playlist Attributes")

For i As Integer = 0 To (playlist.attributeCount - 1) Step 1

    ' Add a tree node for each playlist attribute.
    Dim attribute As String = playlist.attributeName(i)
    playlistRootNode.Nodes.Add(New System.Windows.Forms.TreeNode(attribute))

    ' Add a subnode for the item info for that attribute.
    Dim info As String = playlist.getItemInfo(attribute)
    playlistRootNode.Nodes(i).Nodes.Add(New System.Windows.Forms.TreeNode(info))

Next i

' Add the playlist root node to the tree
displayAttributes.Nodes.Add(playlistRootNode)

' Add nodes for each media item and subnodes for each attribute of that item.
Dim mediaRootNode As System.Windows.Forms.TreeNode = New System.Windows.Forms.TreeNode("Media Items in the Playlist")

For i As Integer = 0 To (playlist.count - 1) Step 1

    ' Get the media item
    Media = playlist.Item(i)

    ' Add a tree node for each media item in the playlist.
    mediaRootNode.Nodes.Add(New System.Windows.Forms.TreeNode(Media.name))

    ' Add a child node for each attribute of the media item
    For j As Integer = 0 To (Media.attributeCount - 1) Step 1

        name = Media.getAttributeName(j)
        mediaRootNode.Nodes(i).Nodes.Add(New System.Windows.Forms.TreeNode(name + ": " + Media.getItemInfo(name)))

    Next j

Next i

' Add the media root node to the tree
displayAttributes.Nodes.Add(mediaRootNode)

Requirements

Requirement	Value
Version	Windows Media Player 9 Series or later
Namespace	WMPLib
Assembly	Interop.WMPLib.dll (Interop.WMPLib.dll.dll)

See also

IWMPPlaylist Interface (VB and C#)