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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。
- [% y3 J. O6 E0 s有一个RasDial拨号函数的定义如下：2 Z [9 W8 `% \( S- v- T6 Q4 N M
DWORD RasDial(
: g5 h) B! |- Q5 JLPRASDIALEXTENSIONS dialExtensions, 5 H7 |: p" ~+ Y6 T
LPTSTR phoneBookPath ,
' K# { y6 q+ O! Y* A, oLPRASDIALPARAMS rasDialParam , 7 b+ M) O5 g' o2 _3 X
DWORD NotifierType,
5 R; a& I" E. M8 C9 ~1 ]LPVOID notifier,
# Q2 J" {% p9 ^& M& K6 MLPHRASCONN pRasConn );5 k& r# u5 X7 p2 b/ C5 c
+ O. \5 W! `' G- E3 }我的MSDN的解说如下：- x7 f' |, i3 ^. w1 J$ U
Parameters
9 s; x! ^# M- N- |) v3 L$ \; d8 ~$ pdialExtensions
# x! D. H2 I7 o9 e. s6 }This parameter is ignored and should be set to NULL. On Windows CE, RasDial always uses the default behaviors for the RASDIALEXTENSIONS options. - v, u$ M0 q/ q# N8 b
phoneBookPath
2 \% x8 o& k9 I% G- e+ E) KThis 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. 6 p3 t, }" y' s4 ~
rasDialParam ) e4 V) X6 J& A/ [# H
Pointer to a RASDIALPARAMS structure that specifies calling parameters for the RAS connection.
% v) s7 y5 w4 e6 tThe caller must set the RASDIALPARAMS structure’s dwSize member to the sizeof(RASDIALPARAMS) to identify the version of the structure being passed. ' H' c8 b* P9 j/ R: _* ^
0 y# {1 t$ D. P9 b4 ENotifierType 7 j1 Y2 G- W( s0 v. \4 ^6 T
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: + {; S3 C8 f- o6 G- [4 a8 |
Value Description 8 A0 }+ H' {/ f$ h
0xFFFFFFFF/ ?/ K, H1 |# E6 Q3 v
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.
) U9 ^( `2 v, `- r" ` The progress notification message uses the WM_RASDIALEVENT message code. 2 t; K. v2 K4 Q6 M* I
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) B% x" o( Q" J+ ~: p! h) Cnotifier $ I2 @4 o) ]8 r7 G$ N5 \0 I" L5 k
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. 2 F! ^6 I: h# R# F: d0 v' l
If 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: . @, ~1 o% j9 p) x+ V2 ?8 s
, x7 T1 L5 a6 ^, X. T# v# O2 O+ MThe connection is established. In other words, the RAS connection state is RASCS_Connected. 8 n! p+ l4 G {5 p3 @- w K
The connection fails. In other words, dwError is nonzero.
% j! m, b6 w, \6 JRasHangUp is called on the connection.
# L% p1 Z/ B; ]5 z+ ^- T! ^7 L8 _The callback notifications are made in the context of a thread captured during the initial call to RasDial.
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pRasConn
( {; L& G$ i2 R( `& c" aPointer 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. # _* r M1 W6 |4 |0 A
Return Values
! p- e. I( [% z5 q0 x, A9 aZero 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. 6 G5 D8 s, M/ l) S
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Include Raserror.h for definitions of the RAS error codes.3 V3 C" C, N: }3 _* F7 `
6 J, x' [% d9 }6 M0 ZRemarks
# }. D' P/ @! N3 {& lThe szCallBackNumber and szPhoneNumber members of the structure pointed to by rasDialParam are not used and should be set to NULL.
/ T# b' Z1 m/ U. G. \$ `# S
, p M, t D: ~$ iRasDial 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.8 R+ [; R% Q7 Z, m
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Errors that occur after the immediate return can be detected by RasGetConnectStatus. Data is available until an application calls RasHangUp to hang up the connection. * w% k' F" ]8 U" }) l4 \
8 T) X7 H2 f' J( bAn 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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5 T* I. x0 K2 }4 B) nThe 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. 6 N$ p7 w( k2 ]: K3 `/ D
# l$ L; o# `: S7 p7 r
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/ p& n& L! H# _5 i* A
DWORD dwRet = RasDial(NULL, NULL, &RasDialParams, 0L, (RASDIALFUNC)RasDialFunc, &hRasConn);
) h. \5 N& d$ `: H( _第五个参数是个回调函数，一般都定义如下：9 o" H4 V$ E) Q( u
void WINAPI CDialerDlg::RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError)5 r7 c: T/ ^/ k, i* r+ T9 t. O
{' O3 U& m" \3 b/ [7 _, B
CDialerDlg * RasDlg = (CDialerDlg*)AfxGetApp()->m_pMainWnd;+ o; _) E9 \: }: j s1 i+ I: c
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RasDlg-> ostMessage(WM_RASDIALEVENT,(WPARAM)rasconnstate,(LPARAM)dwError);
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6 M0 L% h# s* t' I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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