Creating a Nested Playlist
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Creating a Nested Playlist
You can use the server object model to create, retrieve, and modify a nested playlist. The following examples illustrate how to create one. For more information about nested playlists, see Nested Playlist Object.
Visual Basic .NET Example
Imports Microsoft.WindowsMediaServices.Interop Imports interop_msxml Private Sub CreateNested() ' Declare variables. Dim Server As WMSServer Dim Playlist As IXMLDOMDocument Dim ElementSmil As IXMLDOMElement Dim ElementMedia As IXMLDOMElement Dim ProcInst As IXMLDOMNode Dim Root As IXMLDOMNode Dim Node As IXMLDOMNode Try ' Create the WMSServer object. Server = New WMSServer() ' Create a new playlist. Playlist = Server.CreatePlaylist ' Create the processing instruction node. ProcInst = Playlist.createNode( _ DOMNodeType.NODE_PROCESSING_INSTRUCTION, _ "wsx", _ "") ' Add the processing instruction to the file structure. Playlist.appendChild(ProcInst) ProcInst.text = "version = '1.0'" ' Create the root node and add it to the playlist. ElementSmil = Playlist.createElement("smil") Root = Playlist.appendChild(ElementSmil) ' Create a media element and assign a src attribute ' that identifies another playlist. ElementMedia = Playlist.createElement("media") ElementMedia.setAttribute("src", "c:\wmpub\wmroot\playlist.wsx") ' Add the media element to the root node. Node = Root.appendChild(ElementMedia) ' Save the playlist. Playlist.save("c:\wmpub\wmroot\nestedplaylist.wsx") Catch Err As Exception ' TODO: Exception handler goes here. Finally ' TODO: Clean-up code goes here. End Try End Sub
C# Example
using Microsoft.WindowsMediaServices.Interop; using interop_msxml; // Declare the playlist, element, and node variables. IXMLDOMDocument playlist; IXMLDOMElement element_smil, element_media; IXMLDOMNode proc_inst, root, node; try { // Create new server and playlist objects. WMSServer server = new WMSServerClass(); playlist = (IXMLDOMDocument)server.CreatePlaylist(); // Create the processing instruction node. proc_inst = playlist.createNode(DOMNodeType. NODE_PROCESSING_INSTRUCTION, "wsx", ""); // Add the processing instruction to the file structure. playlist.appendChild(proc_inst); proc_inst.text = "version = 1.0"; // Create and add the root node of the playlist. element_smil = playlist.createElement("smil"); root = playlist.appendChild(element_smil); // Create a media element and assign a src attribute // that identifies another playlist. element_media = playlist.createElement("media"); element_media.setAttribute("src", "c:\\wmpub\\wmroot\\playlist.wsx"); node = root.appendChild(element_media); // Save the playlist. playlist.save("c:\\wmpub\\wmroot\\nestedplaylist.wsx"); } catch { // TODO: Exception handler goes here. } finally { // TODO: Clean-up code goes here. }
C++ Example
// Include header files. #include <windows.h> #include <atlbase.h> // Includes CComBSTR and CComVariant. #include "wmsserver.h" // Declare variables and interfaces. IWMSServer *pServer; IXMLDOMDocument *pPlaylist; IXMLDOMElement *pElement_Smil, *pElement_Media; IXMLDOMNode *pProc_Inst, *pRoot, *pNode; CComBSTR bstrName, bstrNamespaceURI, bstrVersion; CComVariant varPath; HRESULT hr; // Initialize the COM library and retrieve a pointer // to an IWMSServer interface. hr = CoInitialize(NULL); if (FAILED(hr))goto EXIT; hr = CoCreateInstance(CLSID_WMSServer, NULL, CLSCTX_ALL, IID_IWMSServer, (void **)&pServer); if (FAILED(hr))goto EXIT; // Create the playlist object. hr = pServer->CreatePlaylist(&pPlaylist); if (FAILED(hr))goto EXIT; // Create the processing instruction node. bstrName = "wsx"; bstrNamespaceURI = ""; hr = pPlaylist->createNode((CComVariant)NODE_PROCESSING_INSTRUCTION, bstrName, bstrNamespaceURI, &pProc_Inst); if (FAILED(hr))goto EXIT; // Add the processing instruction to the file structure. hr = pPlaylist->appendChild(pProc_Inst, NULL); if (FAILED(hr))goto EXIT; bstrVersion = "version = 1.0"; pProc_Inst->put_text(bstrVersion); // Create and add the root node of the playlist. bstrName = "smil"; hr = pPlaylist->createElement(bstrName, &pElement_Smil); if (FAILED(hr))goto EXIT; hr = pPlaylist->appendChild(pElement_Smil, &pRoot); if (FAILED(hr))goto EXIT; // Create a media element and assign a src attribute // that identifies another playlist. bstrName = "media"; hr = pPlaylist->createElement(bstrName, &pElement_Media); if (FAILED(hr))goto EXIT; bstrName = "src"; varPath = "c:\\wmpub\\wmroot\\playlist.wsx"; hr = pElement_Media->setAttribute(bstrName, varPath); if (FAILED(hr))goto EXIT; // Add the media element to the root node. hr = pRoot->appendChild(pElement_Media, &pNode); if (FAILED(hr))goto EXIT; // Save the playlist. varPath = "c:\\wmpub\\wmroot\\nestedplaylist.wsx"; hr = pPlaylist->save(varPath); if (FAILED(hr))goto EXIT; EXIT: // TODO: Release temporary objects and uninitialize COM.
The preceding examples create the following playlist.
<?wsx version = '1.0' ?> <smil> <media src="c:\wmpub\wmroot\playlist.wsx"/> </smil>
See Also (General)
See Also (Visual Basic .NET)
- IWMSServer Object (Visual Basic .NET)
- IXMLDOMDocument Object (Visual Basic .NET)
- IXMLDOMElement Object (Visual Basic .NET)
- IXMLDOMNode Object (Visual Basic .NET)
See Also (C#)
- IWMSServer Object (C#)
- IXMLDOMDocument Object (C#)
- IXMLDOMElement Object (C#)
- IXMLDOMNode Object (C#)
See Also (C++)
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