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IMDSPDevice::GetSerialNumber

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The GetSerialNumber method retrieves the serial number that uniquely identifies the device. This method is optional. When transferring protected content, Windows Media Device Manager uses IMDSPStorageGlobals::GetSerialNumber. For more information, see the second table under Implementing Service Providers.

Syntax

HRESULT GetSerialNumber(
  PWMDMID  pSerialNumber,
  BYTE  abMac[WMDM_MAC_LENGTH]
);

Parameters

pSerialNumber

[out]  Pointer to a WMDMID structure that receives the serial number for the device. This parameter is included in the output message authentication code.

abMac

[in, out]  Array of eight bytes containing the message authentication code for the parameter data of this method. (WMDM_MAC_LENGTH is defined as 8.)

Return Values

The method returns an HRESULT. All the interface methods in Windows Media Device Manager and service provider can return any of the following classes of error codes:

  • Standard COM error codes
  • Windows error codes converted to HRESULT values
  • Windows Media Device Manager error codes

For a complete list of possible error codes, see Error Codes.

Possible values include, but are not limited to, those in the following table.

Return code Description
E_INVALIDARG The pSerialNumber parameter is an invalid or NULL pointer.
WMDM_E_NOTCERTIFIED The caller is not authorized, and calls to other service provider interfaces will also fail and return this code.
WMDM_E_NOTSUPPORTED This device does not support serial numbers.
E_FAIL An unspecified error occurred.

Remarks

Not all media devices support serial numbers. To determine whether the device supports serial numbers, always check the return code when calling this method. If a media device does support serial numbers, the serial number of the media device is guaranteed to be unique.

Requirements

Header: Defined in wmsp.idl.

Library: mssachlp.lib

See Also