Mandatory and Optional Interfaces

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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