lineCallbackFunc

The lineCallbackFunc function is a placeholder for the application-supplied function name.

VOID FAR PASCAL lineCallbackFunc(
  DWORD hDevice,             
  DWORD dwMsg,               
  DWORD dwCallbackInstance,  
  DWORD dwParam1,            
  DWORD dwParam2,            
  DWORD dwParam3             
);

Parameters

hDevice

A handle to either a line device or a call associated with the callback. The nature of this handle (line handle or call handle) can be determined by the context provided by dwMsg. Applications must use the DWORD type for this parameter because using the HANDLE type may generate an error.

dwMsg

A line or call device message.

dwCallbackInstance

Callback instance data passed back to the application in the callback. This DWORD is not interpreted by TAPI.

dwParam1

A parameter for the message.

dwParam2

A parameter for the message.

dwParam3

A parameter for the message.

Remarks

For information about parameter values passed to this function, see Line Device Messages.

All callbacks occur in the application's context. The callback function must reside in a DLL or application module.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 1.3 or later.
  Header: Declared in Tapi.h.