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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。
; ?* ^/ P4 J: h# P+ P有一个RasDial拨号函数的定义如下：, E f- `# g) M& n1 n
DWORD RasDial(
; V: {' Y+ A2 a" cLPRASDIALEXTENSIONS dialExtensions, $ A6 X7 b( n7 M# V' q+ {3 A
LPTSTR phoneBookPath , 4 ^4 U+ C- q n I1 \% s# O2 n
LPRASDIALPARAMS rasDialParam , 7 L$ o3 F6 C' w+ ~8 |- O
DWORD NotifierType,
# \/ Z. q' Q0 V, e# K8 M3 _4 s. oLPVOID notifier,
( F2 I" t$ ?0 A) e: g( l8 ?: k8 ELPHRASCONN pRasConn );
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我的MSDN的解说如下：
) y1 s8 i7 J1 l4 c+ o! gParameters: i% C% ]6 D, H' k! n
dialExtensions - x& h, f7 p }. c
This parameter is ignored and should be set to NULL. On Windows CE, RasDial always uses the default behaviors for the RASDIALEXTENSIONS options.
4 m! n) W1 L* `6 m2 R6 sphoneBookPath
: x! j; ^' G! h5 @# c3 lThis 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.
; z+ T3 w; H% IrasDialParam
5 m; s. U8 N" {) ^Pointer to a RASDIALPARAMS structure that specifies calling parameters for the RAS connection. 6 P. M6 M5 K, ^( e
The caller must set the RASDIALPARAMS structure’s dwSize member to the sizeof(RASDIALPARAMS) to identify the version of the structure being passed. ( Q( I$ j! E" g# l
8 b- V( M) R# ONotifierType
m; N2 v; n: f" s1 Y! X- @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: # S! B; F( }& P5 a6 \
Value Description
1 B% Q. i2 M! M7 f, ^! @! L" T0xFFFFFFFF! i% B6 n$ v9 P$ S5 G% q
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.
- N" v! z; o3 Z The progress notification message uses the WM_RASDIALEVENT message code.
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5 z% C3 y( H% _2 B6 F" V- ?8 ]: {/ z; e7 b2 L! x0 s+ u
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* R7 O+ ]% `8 ]: e9 enotifier
' e& `6 ^( J3 RPointer 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.
x+ B- k# b; V- f7 l5 I9 E$ bIf 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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% g+ B( W$ A% ~! {& b' @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:
% S0 a% A. G( r( ?0 X! N9 u& t
% O! X1 O4 i3 {+ \( N8 VThe connection is established. In other words, the RAS connection state is RASCS_Connected.
8 W9 _* O9 {/ t- O! aThe connection fails. In other words, dwError is nonzero. 8 {% _: t S( Q7 w8 l3 Z, Z
RasHangUp is called on the connection.
9 y/ @/ ?0 ^3 C& v3 Q; H* vThe callback notifications are made in the context of a thread captured during the initial call to RasDial.
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0 O# |8 a( P% C6 @9 A! ~8 a6 spRasConn * a9 F, @8 x! z! ^. D$ o% ~$ ^+ p9 T
Pointer 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.
! W. I3 m# G4 w3 |* @6 w( QReturn Values
9 P( V7 g% _4 U7 J3 t7 CZero 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. - s' z6 V: p8 k9 u J
% W6 C u p- ~
Include Raserror.h for definitions of the RAS error codes.4 q9 z! Q) @# V1 N, \
5 p+ j+ H8 m" h4 c* yRemarks
, z$ ]' l( g# w. R. ZThe szCallBackNumber and szPhoneNumber members of the structure pointed to by rasDialParam are not used and should be set to NULL.
' k, h$ l/ X! {# ]6 Z$ \6 ?5 x8 h2 s9 |7 [% I
RasDial 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.
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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.
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' R! f. C2 Y% X, `9 a5 ]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. : b/ @" k1 u9 i) e, s) E
7 R5 h1 D0 H: C, E# T7 [" j' TAn application can safely call RasHangUp from a RasDial notifier handler. If this is done, however, the hangup does not occur until the routine returns.
# \+ r$ e [ }# l4 o) f( c
9 ?! N9 {$ Y# }+ }- | mThe 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.
) X3 Z$ _+ ~, O `
' S- [0 _ e* x$ N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& q# q0 a/ T2 U/ q" ?% ^9 `
DWORD dwRet = RasDial(NULL, NULL, &RasDialParams, 0L, (RASDIALFUNC)RasDialFunc, &hRasConn);3 A7 r& P* f/ k$ e& \. H. X
第五个参数是个回调函数，一般都定义如下：) Y' O z9 h9 P w" j
void WINAPI CDialerDlg::RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError)
! t% _3 S$ _) @{' C8 }, V. A# ]5 {
CDialerDlg * RasDlg = (CDialerDlg*)AfxGetApp()->m_pMainWnd;
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RasDlg-> ostMessage(WM_RASDIALEVENT,(WPARAM)rasconnstate,(LPARAM)dwError);; C& d9 e* E& M* k8 n0 v$ E" y) u
}
+ @# k# R: T% y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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