lineGetNumberCalls

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Use the lineGetNumberCalls function to retrieve all three call counts for the given line. The sum of the three values represents the total call count. It retrieves exactly the same values as the TAPI LINEADDRESSSTATUS structure. This function exists to enable applications to get the call count more quickly.

LONG WINAPI lineGetNumberCalls(
  HLINE hLine,
  LPDWORD lpdwNumActiveCalls,
  LPDWORD lpdwNumOnHoldCalls,
  LPDWORD lpdwNumOnHoldPendCalls
);

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 in the Windows CE SDK.
  • lpdwNumActiveCalls
    Points to a DWORD indicating the active call count.
  • lpdwNumOnHoldCalls
    Points to a DWORD indicating the number of calls on hold.
  • lpdwNumOnHoldPendCalls
    Points to a DWORD indicating the number of on hold calls pending conference or transfer.

Return Values

The lineGetNumberCalls function returns zero if the function completed successfully, and returns 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 function is synchronous. No LINE_REPLY message is sent.

Requirements

Pocket PC Platforms: Pocket PC 2002 and later
OS Versions: Windows CE 3.0 and later
Header: extapi.h
Library: cellcore.lib

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