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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。
5 O' P& d, i' F有一个RasDial拨号函数的定义如下：6 `1 @% H1 J' m6 c' a2 {
DWORD RasDial(
k( p' w+ h8 ^: T3 @. s, n. gLPRASDIALEXTENSIONS dialExtensions,
* v& x# y# h& Z' FLPTSTR phoneBookPath , 3 m! T6 h6 V: \& p4 Q N
LPRASDIALPARAMS rasDialParam ,
9 [# ?. B0 x0 A" L$ WDWORD NotifierType,
$ T% v; c! ^# d: w; y* {9 o) oLPVOID notifier,
) d0 ` d8 Z; J W9 FLPHRASCONN pRasConn );) h; q) q" y. s& j: q$ L c2 l3 ` Y
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我的MSDN的解说如下：
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dialExtensions
7 ]6 ~3 g+ l) a# P' nThis parameter is ignored and should be set to NULL. On Windows CE, RasDial always uses the default behaviors for the RASDIALEXTENSIONS options. ' F/ `0 q# t4 L
phoneBookPath
6 J) Q' T' X# u, xThis 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. 0 t4 s- f5 t$ _( j
rasDialParam 3 J8 q" Y" Q# i! s6 ~% F; p0 B& e
Pointer to a RASDIALPARAMS structure that specifies calling parameters for the RAS connection.
9 p- v G+ M9 G6 q4 L# ^. cThe caller must set the RASDIALPARAMS structure’s dwSize member to the sizeof(RASDIALPARAMS) to identify the version of the structure being passed.
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5 ?. a G, P* s7 B' V3 bNotifierType
. a# v' d* p5 q! B# w7 a" @( wSpecifies the nature of the notifier parameter. If notifier is NULL, NotifierType is ignored. If notifier is not NULL, set NotifierType to the following value:
* M/ R" k; J( Y3 B3 ^Value Description
) b* E' V9 }7 }" \- ?+ g- @6 @$ c0xFFFFFFFF* p5 U' M% z4 s9 J1 F
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. 4 ^2 v! H! k3 `( B8 g6 u5 G# v
The progress notification message uses the WM_RASDIALEVENT message code. * I Z/ ~+ y) F8 K: h7 V
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7 k( o% O, B0 m. B/ [notifier - a4 ~3 J* i3 V* C
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. $ N6 x9 b' \8 o" m, y; {7 ^
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:
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; p! K6 x) g, o2 s: GThe connection is established. In other words, the RAS connection state is RASCS_Connected. : E' U- b, g0 _0 _/ Q% ~
The connection fails. In other words, dwError is nonzero.
! B1 V g6 v( L! p4 ^+ z0 PRasHangUp is called on the connection.
8 t9 c& A9 v8 {9 U, I; T+ g9 rThe callback notifications are made in the context of a thread captured during the initial call to RasDial. ' W8 l8 k% I7 R2 \( z" j
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pRasConn : w$ x; ]: D4 u6 P: [
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. 4 x/ S5 j# e& _/ E1 S4 Z' r! ?* {& ?/ n
Return Values+ l9 z+ {, ^2 W
Zero 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. , G# s- j2 O z7 l3 S
% Y( Q/ {- E* W- k2 NInclude Raserror.h for definitions of the RAS error codes.
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Remarks6 F. w$ R0 i( L* j/ O+ }
The szCallBackNumber and szPhoneNumber members of the structure pointed to by rasDialParam are not used and should be set to NULL.
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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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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. ! v, t9 R! \1 m
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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. ( l# i# Q+ p1 c* C
3 K5 m9 h+ l( S$ t( H: @% D2 bThe 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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. A% C9 \7 c+ W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- @' K W' T; p3 {, D- t5 L
DWORD dwRet = RasDial(NULL, NULL, &RasDialParams, 0L, (RASDIALFUNC)RasDialFunc, &hRasConn);$ S) A q/ h5 a) T9 u& C
第五个参数是个回调函数，一般都定义如下：
( _! C0 C0 {& Kvoid WINAPI CDialerDlg::RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError)
" ?! p$ }8 n& y! P `{
% n0 D4 S2 Z! U* H0 | CDialerDlg * RasDlg = (CDialerDlg*)AfxGetApp()->m_pMainWnd;& F! ?: k4 j* p/ |+ P# b* N
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RasDlg-> ostMessage(WM_RASDIALEVENT,(WPARAM)rasconnstate,(LPARAM)dwError);1 T! `& ^& M: ]& m6 f% Z* T! x( m" g
}
( f) a# L. |, j6 R: i' m这个回调函数将会把拨号的状态POST到各个窗口句柄。 J* \- J6 c: {& ?6 R: b$ d
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