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4/8/2010

Use the lineSetCallWaitingStatefunction to set call waiting for a given set of media modes.

Syntax 

LONG WINAPI lineSetCallWaitingState (
  HLINE 
hLine,
  DWORD 
dwClasses,
  DWORD 
dwState
);

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.

dwClasses

Indicates which line capability classes to enable or disable. See the Line Capability Classesconstants for possible values.

dwState

Points to a DWORD indicating the call waiting state. Possible values are listed in the following table.

Value Description

LINECALLWAITING_ENABLED

Call waiting is enabled.

LINECALLWAITING_DISABLED

Call waiting is disabled.

Return Value

Returns a positive request identifier if the function is completed asynchronously, or a negative error number if an error occurs. The dwParam2parameter of the corresponding LINE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. The following are possible return values:

  • LINEERR_INVALLINEHANDLE

  • LINEERR_NOMEM

  • LINEERR_OPERATIONUNAVAIL

  • LINEERR_OPERATIONFAILED

  • LINEERR_RESOURCEUNAVAIL

  • LINEERR_INVALPOINTER

  • LINEERR_INVALPARAM

  • LINEERR_UNINITIALIZED

Remarks

This is a privileged function.

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