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PHONEEVENT callback function (tspi.h)

  • Article

Phone_Event 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.

The PHONEEVENT type defines a pointer to this callback function. Phone_Event is a placeholder for the application-defined function name.

Syntax

PHONEEVENT Phoneevent;

void Phoneevent(
  HTAPIPHONE htPhone,
  DWORD dwMsg,
  DWORD_PTR dwParam1,
  DWORD_PTR dwParam2,
  DWORD_PTR 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 value

None

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 Completion_Proc callback instead of this one.

Requirements

Requirement Value
Target Platform Windows
Header tspi.h

See also

Completion_Proc

TSPI_lineOpen