PHONEEVENT

This type is a callback function implemented by TAPI and supplied to the service provider as a parameter to TSPI_phoneOpen. The service provider calls this function to report events that occur on the phone.

PHONEEVENT Phone_Event; 
void(
  CALLBACK *Phone_Event)(
  HTAPIPHONE htPhone,       
  DWORD dwMsg,              
  DWORD dwParam1,           
  DWORD dwParam2,           
  DWORD dwParam3            
);

Parameters

htPhone

The TAPI handle for the phone on which the event occurred.

dwMsg

Specifies the kind of event that is being reported. Interpretation of the other parameters is done in different ways according to the context indicated by dwMsg.

dwParam1

A parameter for the message.

dwParam2

A parameter for the message.

dwParam3

A parameter for the message.

Return Values

No return value.

Remarks

The call state when calling this function can be any state.

The service provider passes the HTAPIPHONE value supplied to TSPI_phoneOpen as the htPhone parameter. It includes the message identifier and parameters specific to the event.

The sets of messages that can be passed to this procedure differ slightly from the messages to the corresponding callback at the TAPI level. In particular, completion of asynchronously executing requests is reported through the ASYNC_COMPLETION callback instead of this one.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 2.0 or later.
  Header: Declared in Tspi.h.

See Also

ASYNC_COMPLETION, TSPI_lineOpen