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IWMDMDevice::GetSerialNumber

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The GetSerialNumber method retrieves a serial number that uniquely identifies the device.

Syntax

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

Parameters

pSerialNumber

[out]  Pointer to a WMDMID structure containing the serial number information.

abMac[WMDM_MAC_LENGTH]

[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
S_OK The method succeeded.
E_INVALIDARG The pSerialNumber parameter is an invalid or NULL pointer.
WMDM_E_NOTSUPPORTED The device does not support serial numbers.
E_FAIL An unspecified error occurred.

Remarks

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

After calling this method, an application can calculate the message authentication code (MAC) values of parameters and compare them with output MAC values to ensure that the parameters have not been tampered with. For guidance on how to do this, see the example code in the Remarks section under IWMDMStorage::GetRights.

Requirements

Header: Defined in wmdm.idl.

Library: mssachlp.lib

See Also