lineGetNumberCalls
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4/8/2010
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
| Header | extapi.h |
| Library | cellcore.lib |
| Windows Embedded CE | Windows CE 3.0 and later |
| Windows Mobile | Pocket PC 2002 and later, Smartphone 2002 and later |