IWMDMDeviceControl::Play
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The Play method begins playing at the current seek position. If the IWMDMDeviceControl::Seek method has not been called, then playing begins at the beginning of the first file, and the play length is not defined.
Syntax
HRESULT Play();
Parameters
This method takes no parameters.
Return Values
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
| S_OK | The method succeeded. |
| E_BUSY | The device is busy. |
| WMDM_E_NOTSUPPORTED | The play function is not implemented on this device. |
| E_FAIL | An unspecified error occurred. |
Remarks
This method is used to invoke both device playback (playing an audio track on a storage medium of the media device) and streaming audio playback (streaming audio data from the user's computer to the media device, where it is played). The IWMDMDeviceControl::Seek method determines the form of playback that occurs.
Some devices do not support either device playback or streaming audio playback. Before attempting to start playback of a particular type, the IWMDMDeviceControl::GetCapabilities method must be called. If unsupported playback is attempted, this method returns WMDM_E_NOTSUPPORTED.
To determine before invoking the play operation whether an audio format can be played by the media device, you can call the IWMDMDevice::GetFormatSupport method.
Requirements
Header: Defined in wmdm.idl.
Library: mssachlp.lib
See Also