lineGetNumberCalls (Windows Embedded CE 6.0)

1/6/2010

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.

Syntax

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.

• 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 Value

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 function is synchronous. No LINE_REPLY message is sent.

This is a privileged function.

For CDMA, lineGetNumberCalls returns 0 or 1 for the number of calls. The network does not report that there are multiple calls.

Requirements

See Also

Reference

Extended TAPI Functions