Mandatory and Optional Interfaces

The following table describes the mandatory and optional interfaces and methods for service providers to implement. All the interfaces with one or more mandatory methods must be implemented. A mandatory method cannot return WMDM_E_NOTSUPPORTED or E_NOTIMPL.

Interface and method	Implementation option
IMDServiceProvider::EnumDevices	Mandatory.
IMDServiceProvider::GetDeviceCount	Mandatory.
IMDServiceProvider2::CreateDevice	Optional. This method must be implemented for PnP and Windows Explorer support.
IMDSPDevice::EnumStorage	Mandatory.
IMDSPDevice::GetDeviceIcon	Mandatory.
IMDSPDevice::GetFormatSupport	Mandatory.
IMDSPDevice::GetManufacturer	Mandatory.
IMDSPDevice::GetName	Mandatory.
IMDSPDevice::GetPowerSource	Optional.
IMDSPDevice::GetSerialNumber	Optional. For protected content transfer, Windows Media Device Manager uses IMDSPStorageGlobals::GetSerialNumber.
IMDSPDevice::GetStatus	Mandatory.
IMDSPDevice::GetType	Mandatory.
IMDSPDevice::GetVersion	Optional.
IMDSPDevice::SendOpaqueCommand	Optional.
IMDSPDevice2::GetCanonicalName	Optional.
IMDSPDevice2::GetFormatSupport2	Mandatory.
IMDSPDevice2::GetSpecifyPropertyPages	Optional.
IMDSPDevice2::GetStorage	Optional.
IMDSPDeviceControl Interface	Optional.
IMDSPEnumDevice::Clone	Mandatory.
IMDSPEnumDevice::Next	Mandatory.
IMDSPEnumDevice::Reset	Mandatory.
IMDSPEnumDevice::Skip	Mandatory.
IMDSPEnumStorage::Clone	Mandatory.
IMDSPEnumStorage::Next	Mandatory.
IMDSPEnumStorage::Reset	Mandatory.
IMDSPEnumStorage::Skip	Mandatory.
IMDSPObject::Close	Mandatory.
IMDSPObject::Delete	Mandatory.
IMDSPObject::Move	Optional.
IMDSPObject::Open	Mandatory.
IMDSPObject::Read	Mandatory (if Windows Media Player support is desired).
IMDSPObject::Rename	Optional.
IMDSPObject::Seek	Optional.
IMDSPObject::Write	Mandatory.
IMDSPObjectInfo Interface	Optional.
IMDSPRevoked Interface	Optional.
IMDSPStorage::CreateStorage	Mandatory only if dwAttributes is WMDM_FILE_ATTR_FILE.
IMDSPStorage::EnumStorage	Mandatory.
IMDSPStorage::GetAttributes	Mandatory.
IMDSPStorage::GetDate	Mandatory.
IMDSPStorage::GetName	Mandatory.
IMDSPStorage::GetRights	Optional.
IMDSPStorage::GetSize	Mandatory.
IMDSPStorage::GetStorageGlobals	Mandatory.
IMDSPStorage::SendOpaqueCommands	Optional.
IMDSPStorage::SetAttributes	Optional.
IMDSPStorage2::CreateStorage2	Mandatory.
IMDSPStorage2::GetAttributes2	Mandatory.
IMDSPStorage2::GetStorage	Optional.
IMDSPStorage2::SetAttributes2	Optional.
IMDSPStorage3 Interface	Optional. However, if the device parameter UseMetadataViews is set to 1, this interface must be implemented, and IMDSPStorage3::GetMetadata becomes mandatory, although IMDSPStorage3::SetMetadata is still optional.
IMDSPStorageGlobals::GetCapabilities	Mandatory.
IMDSPStorageGlobals::GetDevice	Mandatory.
IMDSPStorageGlobals::GetRootStorage	Mandatory.
IMDSPStorageGlobals::GetSerialNumber	Mandatory for PDDRM only. Optional otherwise.
IMDSPStorageGlobals::GetStatus	Mandatory.
IMDSPStorageGlobals::GetTotalBad	Mandatory.
IMDSPStorageGlobals::GetTotalFree	Mandatory.
IMDSPStorageGlobals::GetTotalSize	Mandatory.
IMDSPStorageGlobals::Initialize	Optional. This method should be implemented if the device supports this functionality. If this method is not implemented, IMDSPStorageGlobals::GetCapabilites must return WMDM_STORAGECAP_NOT_INITIALIZABLE in addition to any other flags.
IMDSPDevice3 IMDSPObject2 IMDSPStorage4	Required to support automatic synchronization with Windows Media Player

See Also

• Creating a Service Provider