A RasDialFunc2 function is an application-defined or library-defined callback function that the RasDial function calls when a change of state occurs during a remote access connection process. A RasDialFunc2 function is similar to the RasDialFunc1 callback function, except that it provides additional information for multilink connections.
DWORD WINAPI RasDialFunc2(
DWORD dwCallbackId, |
// user-defined value specified in RasDial call |
DWORD dwSubEntry, |
// subentry index in multilink connection |
HRASCONN hrasconn, |
// handle to RAS connection |
UINT unMsg, |
// type of event that has occurred |
RASCONNSTATE rascs, |
// connection state about to be entered |
DWORD dwError, |
// error that may have occurred |
DWORD dwExtendedError |
// extended error information for some errors |
); |
The RasDial function calls RasDialFunc2 with dwError set to zero upon entry to each connection state. If an error occurs within a state, RasDial calls RasDialFunc2 again with a nonzero dwError value.
In some error cases, the dwExtendedError parameter contains extended
error information.
The contents of dwExtendedError are defined for values of dwError as follows:
dwError |
dwExtendedError |
ERROR_SERVER_NOT_RESPONDING |
Specifies the NetBIOS error that occurred. |
ERROR_NETBIOS_ERROR |
Specifies the NetBIOS error that occurred. |
ERROR_AUTH_INTERNAL |
Specifies an internal diagnostics code. |
ERROR_CANNOT_GET_LANA |
Specifies a routing error code, which is a RAS error. |
If the RasDialFunc2 function returns a nonzero value, RasDial continues to send callback notifications.
If the RasDialFunc2 function returns zero, RasDial stops sending callback notifications for all subentries.
A RasDial connection operation is suspended during a call to a RasDialFunc2 callback function. For that reason, your RasDialFunc2 implementation should generally return as quickly as possible. There are two exceptions to that rule. Asynchronous (slow) devices such as modems often have time-out periods measured in seconds rather than milliseconds; a less-than-prompt return from a RasDialFunc2 function is generally not a problem. The prompt return requirement also does not apply when dwError is nonzero, indicating that an error has occurred. It is safe, for example, to put up an error dialog box and wait for user input.
Your RasDialFunc2 implementation should not depend on the order or occurrence of particular RASCONNSTATE connection states, because this may vary between platforms.
Do not call the RasDial function from within a RasDialFunc2 callback function. You can call the RasGetConnectStatus, RasEnumEntries, RasEnumConnections, RasGetErrorString, and RasHangUp functions from within the callback function. For example, calling RasGetConnectStatus from within a callback function would be useful for determining the name and type of the connecting device.
Note that, for convenience, RasHangUp can be called from within a RasDialFunc2 callback function. However, much of the hang-up processing occurs after the RasDialFunc2 callback function has returned.
RasDialFunc2 is a placeholder for the application-defined or library-defined function name.
RasDial, RasDialFunc, RasDialFunc1, RASCONNSTATE, RasEnumConnections, RasEnumEntries, RasGetConnectStatus, RasGetErrorString, RasHangUp
file: /Techref/os/win/api/win32/func/src/f70_3.htm, 8KB, , updated: 2000/4/7 12:19, local time: 2024/8/23 15:40,
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