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发表于 2003-10-25 00:48:00
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谢谢周老师，不过这个问题我自己查了将近一个月的MSDN，终于搞定了。
' X3 ?) ?6 B0 R- d; q有一个RasDial拨号函数的定义如下：
) M2 R- \: g; \- ]' ZDWORD RasDial(
3 y6 J7 z: q$ z* J: e7 s9 K& mLPRASDIALEXTENSIONS dialExtensions, 6 _1 r/ z3 Q( x1 Z+ ^
LPTSTR phoneBookPath ,
, Q, X4 T ] [, x; F o/ s1 OLPRASDIALPARAMS rasDialParam , S4 i" j4 H7 \$ f/ |# b5 p
DWORD NotifierType, * J0 h8 A" z/ f! M( l3 }
LPVOID notifier, % e0 f0 q' a/ c/ K( u% D$ S
LPHRASCONN pRasConn );4 p X9 a- L, @- L
6 j, e& T) z* t i4 q6 N我的MSDN的解说如下：2 c) G( ?) I, T( l2 S
Parameters
# M2 h, Z1 k$ m3 h" Y- adialExtensions , k% \: R3 \1 [* r9 h1 T4 j
This parameter is ignored and should be set to NULL. On Windows CE, RasDial always uses the default behaviors for the RASDIALEXTENSIONS options. 7 D4 H9 D0 }; H/ i4 F
phoneBookPath
6 ? p, i4 d) d/ q- ^This parameter is ignored and should be set to NULL. Dial-up networking stores phone-book entries in the registry rather than in a phone-book file. 7 Z0 O& f; @) E$ Q( [9 C
rasDialParam
$ N# l7 z- Y. x( nPointer to a RASDIALPARAMS structure that specifies calling parameters for the RAS connection. q- J0 ?5 P% y# q' ]
The caller must set the RASDIALPARAMS structure’s dwSize member to the sizeof(RASDIALPARAMS) to identify the version of the structure being passed. : {) E8 E! A% {( W. @/ p* i
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NotifierType 3 E- v( `$ `; v. p& m8 D$ u# h
Specifies the nature of the notifier parameter. If notifier is NULL, NotifierType is ignored. If notifier is not NULL, set NotifierType to the following value: - ]6 Z# U* A; T0 Z# U: @9 y
Value Description
: {7 g1 M$ }' S8 u2 P/ F# _6 I, ?0xFFFFFFFF
3 O; @" G3 r( H4 ~0xFFFFFFFF The notifier parameter is a handle to a window to receive progress notification messages. In a progress notification message, wParam indicates the connection state (rasconnstate) which the RAS connection is about to enter, while lParam indicates whether or not an error occurred. 1 ^" [" L5 T e6 N) p8 j
The progress notification message uses the WM_RASDIALEVENT message code. 5 F7 l& E: I! X/ k9 O8 T
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notifier 7 F0 t& R" R/ O' W
Pointer to a window handle to receive RasDial event notifications. If this parameter is not NULL, RasDial sends the window a message for each RasDial event. Additionally, the RasDial call operates asynchronously: RasDial returns immediately, before the connection is established, and uses the window to communicate its progress.
$ x8 E% E; @! k- FIf notifier is NULL, the RasDial call operates synchronously: RasDial does not return until the connection attempt has completed successfully or failed.
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If notifier is not NULL, notifications to the window can occur at any time after the initial call to RasDial. Notifications end when one of the following events occurs: % o" i. }4 e, H7 Z# X. X
, h4 _, I7 t$ H2 C/ r! hThe connection is established. In other words, the RAS connection state is RASCS_Connected. + S$ K6 o3 |% V: ^
The connection fails. In other words, dwError is nonzero.
1 Z5 ]* R% e5 I8 w. M/ WRasHangUp is called on the connection. ( T6 @1 x& H" }; j) p: j. ]
The callback notifications are made in the context of a thread captured during the initial call to RasDial. - a, F! b1 \% Z& @# X. v
7 y+ b* v! S) v$ J0 ipRasConn
+ ^: W" h' f7 C$ b) b4 w" rPointer to a variable of type HRASCONN. You must set the HRASCONN variable to NULL before calling RasDial. If RasDial succeeds, it stores a handle to the RAS connection into pRasConn. ) q: ~; K9 A/ M5 ^* S& H
Return Values
+ t! ~$ M& K& Z) iZero indicates success. In addition, the function stores a handle to the RAS connection into the variable pointed to by pRasConn. A nonzero error value, either from the set listed in the RAS header file or ERROR_NOT_ENOUGH_MEMORY, indicates failure. " z8 ] u. R- z# n/ N
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Include Raserror.h for definitions of the RAS error codes.
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Remarks8 {3 w/ @1 N" }+ Y. a
The szCallBackNumber and szPhoneNumber members of the structure pointed to by rasDialParam are not used and should be set to NULL.) Q T8 L' _. W; f$ ]" N
J* r1 F' k& P, XRasDial will not automatically display the logon dialog box. This is currently done through the Remote Networking application. Applications are responsible for getting the information from the user." H5 X: R* H; j# j
+ V! d% z$ P% t mErrors that occur after the immediate return can be detected by RasGetConnectStatus. Data is available until an application calls RasHangUp to hang up the connection.
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) ?' Z, O ?$ Z8 A, t- l3 p! `An application must eventually call RasHangUp whenever a non-NULL connection handle is stored into pRasConn. This applies even if RasDial returns a nonzero (error) value.
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An application can safely call RasHangUp from a RasDial notifier handler. If this is done, however, the hangup does not occur until the routine returns.
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' {% u& N: L7 O8 H) f/ F3 sThe window handle-based notification only works if the underlying configuration supports the PostMessage function. PostMessage is exposed through the msgque component, which is a part of the GWES module. Event notification through a window handle can only work if GWES is part of the underlying configuration.
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看了好久才算是略略通了一点，要实现我原先预期的效果，首先要用RasDial函数进行拨号) g+ L2 T9 t4 @, T& M# M* D
DWORD dwRet = RasDial(NULL, NULL, &RasDialParams, 0L, (RASDIALFUNC)RasDialFunc, &hRasConn);: A$ p# l$ H- k _- L
第五个参数是个回调函数，一般都定义如下：
4 |, b0 P+ z5 f; m! bvoid WINAPI CDialerDlg::RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError)
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CDialerDlg * RasDlg = (CDialerDlg*)AfxGetApp()->m_pMainWnd;
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RasDlg-> ostMessage(WM_RASDIALEVENT,(WPARAM)rasconnstate,(LPARAM)dwError);5 y0 s8 P' @8 g
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这个回调函数将会把拨号的状态POST到各个窗口句柄。
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发表于 2003-9-21 10:56:00
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