lineGetUSSD

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Use the lineGetUSSD function to read an Unstructured Supplementary Service Data (USSD) message.

LONG WINAPI lineGetUSSD(
  HLINE hLine,
  DWORD dwID,
  LPBYTE lpbUSSD,
  DWORD dwUSSDSize,
  LPDWORD lpdwFlags
);

Parameters

• hLine
  The line device handle. The line device handle must have been previously obtained by a call to lineOpen with the proper TAPI device ID specified and a device-specific extension version successfully negotiated with lineNegotiateExtVersion. For more information about lineNegotiateExtVersion and lineOpen, see the TAPI Functions API Reference topics on MSDN.
• dwID
  Indicates which USSD message to retrieve. The identifier is specified in the LINE_DEVSPECIFIC or LINE_USSD message that the application received.
• lpbUSSD
  Points to a buffer to which the USSD message will be copied.
• dwUSSDSize
  Indicates the size in bytes of the lpszUSSD buffer.
• lpdwFlags
  Points to a DWORD indicating special flags pertaining to this network-originated USSD message. Possible values are listed in the following table.

  Value	Description
  LINEUSSDFLAG_ACTIONREQUIRED	Network needs more USSD information sent back.
  LINEUSSDFLAG_ACTIONNOTNEEDED	Network does not need more USSD info.
  LINEUSSDFLAG_TERMINATED	Network has terminated USSD session.
  LINEUSSDFLAG_OTHERCLIENTRESPONDED	Network has terminated the USSD session because another client responded.
  LINEUSSDFLAG_UNSUPPORTED	Network does not support USSD.
  LINEUSSDFLAG_TIMEOUT	USSD session timed out.
  LINEUSSDFLAG_ENDSESSION	Network is terminating USSD session.

Return Values

Returns zero if the function completes successfully, or a negative error number if an error occurs. The following are possible return values:

LINEERR_RESOURCEUNAVAIL
LINEERR_INVALLINEHANDLE
LINEERR_STRUCTURETOOSMALL
LINEERR_INVALPOINTER
LINEERR_UNINITIALIZED
LINEERR_NOMEM
LINEERR_OPERATIONUNAVAIL
LINEERR_OPERATIONFAILED

Remarks

This is a privileged function.

This function is synchronous. No LINE_REPLY message is sent. Not implemented for CDMA.

Requirements

Pocket PC: Pocket PC 2002 and later.
Smartphone: Smartphone 2002 and later.
OS Versions: Windows CE 3.0 and later.
Header: Extapi.h.
Library: Cellcore.lib.

See Also

Extended TAPI Functions

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