AutoDial Connection Operations
When an attempt to connect to a network address fails because the host cannot
be reached, the system searches the AutoDial mapping database for the address.
If the address is in the database, the system initiates an AutoDial operation
for the
RASAUTODIALENTRY, if any, that corresponds to the local TAPI dialing location.
The Win32 API provides functions that enable you to set and query AutoDial
parameters that control AutoDial connections. You can call the
RasSetAutodialEnable function to enable or disable the AutoDial feature for a specified TAPI
dialing location. The
RasGetAutodialEnable function indicates whether the AutoDial feature is enabled for a specified
TAPI dialing location. For more information about TAPI dialing locations, see the
TAPI documentation. You can call the
RasSetAutodialParam function to set other AutoDial connection parameters. For example, you can
disable AutoDial connections for the current logon session. Call the
RasGetAutodialParam function to determine the current value of the AutoDial connection parameters.
The system provides a default user interface for AutoDial dialing operations.
However, you can create an AutoDial dynamic-link library (DLL) to provide a
custom user interface for AutoDial dialing operations involving specified
phone-book entries. Your AutoDial DLL must export both an ANSI and a Unicode version of
a
RASADFunc AutoDial handler.
To enable your custom AutoDial handler for a phone-book entry, call the
RasSetEntryProperties function to set the properties for that entry. The
szAutodialDll and
szAutodialFunc members of the
RASENTRY structure passed to
RasSetEntryProperties specify the name of your AutoDial DLL and the name of your
RASADFunc function, excluding the "A" or "W" suffix.
When the system starts an AutoDial operation for a phone-book entry with a
custom AutoDial handler, it calls the specified
RASADFunc. The RASADFunc function receives a pointer to a
RASADPARAMS structure that indicates the location and parent window for the window of
your user interface. Your
RASADFunc can start a thread to perform the custom dialing operation. The
RASADFunc function returns TRUE to indicate that it took over the dialing, or FALSE to
allow the system to perform the dialing. Your custom dialing operation must use
the
RasDial function to do the actual dialing. When the dialing operation has been
completed, the custom dialing operation indicates success or failure by setting the
variable pointed to by the
lpdwRetCode parameter passed to
RASADFunc.
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