Windows Media Player 11 SDK About CD Burning 

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About CD Burning

The Windows Media Player 11 SDK introduces new functionality for creating CDs. This process is called burning.

To enumerate the CD drives on the user's computer, use the IWMPCdromCollection interface. You retrieve a pointer to this interface by calling IWMPCore::get_cdromCollection. By using the count and item methods, you can iterate the collection to retrieve an IWMPCdrom interface pointer for each CD drive on the user's computer. The IWMPCdrom interface represents an individual CD drive.

Before you begin burning a CD, you must first call QueryInterface through an IWMPCdrom pointer to retrieve a pointer to the IWMPCdromBurn interface. By using the isAvailable method, you can determine whether a particular CD drive can burn CDs, whether there is a CD in the drive, and how the CD can be used.

To specify the items to burn to CD, you must create a playlist. Windows Media Player represents playlists by using the IWMPPlaylist interface. You can create this playlist any way you like. For example, you might simply retrieve a playlist from the library by calling IWMPMediaCollection::getByAlbum. After you create the playlist that you want to burn to CD, you must call the IWMPCdromBurn::put_burnPlaylist method and pass the playlist pointer as an argument. This sets your playlist as the one that Windows Media Player will copy to the CD.

If you retrieve a playlist from the library, any changes you make to the playlist will be reflected in the user's library. To avoid this, call IWMPPlaylist::setItemInfo, passing the attribute name "Temporary" and the value "true". This converts your playlist instance to a temporary playlist, which can be edited without changing the original playlist.

Each time you set a new playlist for burning, or make changes to an existing burn playlist, you must call IWMPCdromBurn::refreshStatus to update the status information. This ensures that Windows Media Player does the processing necessary to provide you with accurate status information for the CD burning operation.

To specify the type of CD to burn, call IWMPCdromBurn::put_burnFormat. Windows Media Player enables you to burn two types of CDs: audio CDs and data CDs. The WMPBurnFormat enumeration defines the CD types.

You can specify a volume label for the CD by calling IWMPCdromBurn::put_label.

When you are ready to begin burning the CD, call IWMPCdromBurn::startBurn. You can monitor the progress of the burning operation by periodically calling IWMPCdromBurn::get_burnProgress. This method retrieves a progress value for the entire burning operation. The value retrieved is a number that represents the percentage of burning completed. You can monitor the state of the burning operation by handling the IWMPEvents3::CdromBurnStateChange event, which uses the WMPBurnState enumeration to indicate the current state. You should be careful to compare the IWMPCdromBurn pointer (provided by the event) to the pointer that represents your burning operation to ensure that the event was raised by your operation. You can stop the burning operation by calling IWMPCdromBurn::stopBurn.

There are two events that you can handle to receive error notifications about your burning operation. The IWMPEvents3::CdromBurnError event is raised when a generic error occurs. IWMPEvents3::CdromBurnMediaError is raised when a particular media item causes an error during burning. Like the CdromBurnStateChange event, each of these events provides an IWMPCdromBurn pointer that represents the burning operation that raised the event. The CdromBurnMediaError event provides an IDispatch pointer that represents the media item that raised the event. You can call QueryInterface through this pointer to retrieve an IWMPMedia pointer.

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