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4/8/2010

Use the lineGetCallWaitingStatefunction to retrieve the list of media modes for which call waiting is enabled.

Syntax 

LONG WINAPI lineGetCallWaitingState(
  HLINE 
hLine,
  LPDWORD 
lpdwClasses
);

Parameters

hLine

The line device handle. The line device handle must have been previously obtained by a call to lineOpenwith the proper TAPI device ID specified and a device-specific extension version successfully negotiated with lineNegotiateExtVersion.

lpdwClasses

Points to a DWORD indicating which line capability classes are enabled for call waiting. See the Line Capability Classesconstants for possible values.

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. Not implemented for CDMA.

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

See Also