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            &nbsp&nbsp//设置指定拨号连接的拨号参数 <br>
            &nbsp&nbspdwResult := RasSetEntryDialParams( '',@RASDIALPARAMSData,RemovePWD 
            ); <br>
            &nbsp&nbsp <br>
            &nbsp&nbspif dwResult &lt;&gt; 0 then //设置指定拨号连接的拨号参数失败 <br>
            &nbsp&nbspmemo1.lines.add( '设置'+StrPAS(RASDIALPARAMSData.szEntryName 
            )+'拨号参数失败:' + GetRasError( dwResult )) <br>
            &nbsp&nbspelse <br>
            &nbsp&nbspbegin//显示指定拨号连接的拨号参数 <br>
            &nbsp&nbspmemo1.lines.add( StrPAS(RASDIALPARAMSData.szEntryName )+'拨号参数设置成功'); 
            <br>
            &nbsp&nbspmemo1.lines.add( '用户名称:' + StrPAS(RASDIALPARAMSData.szUserName 
            )); <br>
            &nbsp&nbspmemo1.lines.add( '用户密码:' + StrPAS(RASDIALPARAMSData.szPassword 
            )); <br>
            &nbsp&nbspmemo1.lines.add( '域 名:' + StrPAS(RASDIALPARAMSData.szDomain 
            )); <br>
            &nbsp&nbspmemo1.lines.add( '回叫号码:' + StrPAS(RASDIALPARAMSData.szCallbackNumber 
            )); <br>
            &nbsp&nbspmemo1.lines.add( '拨号号码:' + StrPAS(RASDIALPARAMSData.szPhoneNumber 
            )); <br>
            &nbsp&nbspend; <br>
            &nbsp&nbspend; <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp四、用指定的拨号连接拨号、挂断指定的拨号连接 <br>
            &nbsp&nbsp  1、用指定的拨号连接拨号 <br>
            &nbsp&nbsp    拨号有两种方法,一种是调用拨号网络中的拨号程序,就象用户自己用鼠标双击拨号连接名称一 样,用户可以修改拨号号码、用户名称和用户密码,最后由拨号网络来完成拨号过程;另一个方法则 
            是调用RasAPI函数. <br>
            &nbsp&nbsp(1)用拨号网络中的拨号程序 <br>
            &nbsp&nbsp       在程序中可以用如下代码: <br>
            &nbsp&nbsp       winexec('rundll32.exe rnaui.dll,RnaDial 169',SW_SHOWNORMAL); 
            <br>
            &nbsp&nbsp       其中字符串中的最后一个参数"169"为拨号连接的名称。 <br>
            &nbsp&nbsp(2)用RasAPI函数拨号 用拨号连接拨号的RasAPI函数为RasDial,其函数原型为: <br>
            &nbsp&nbspfunction RasDial( <br>
            &nbsp&nbsppRasDialExtensions : LPRASDIALEXTENSIONS;//在WIN9X下无用,可设置为NIL 
            <br>
            &nbsp&nbsplpszPhonebook : PChar;//电话本名称,在Win9X下无作用,可为空字符串 <br>
            &nbsp&nbsplpRasDialParams : LPRASDIALPARAMS;//拨号参数 <br>
            &nbsp&nbspdwNotifierType : DWORD;//消息通知方式 <br>
            &nbsp&nbsphandle : TRasDialFunc;//消息处理事件 <br>
            &nbsp&nbspvar lphRasConn : DWORD//返回的成功连接的连接句柄 <br>
            &nbsp&nbsp) : DWORD; stdcall; <br>
            &nbsp&nbspfunction RasDial;external RasApiDll name 'RasDialA'; <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp    参数pRASDIALPARAMS的说明同RasGetEntryDialParams. <br>
            &nbsp&nbsp    参数dwNotifierType表示消息通知方式.在拨号过程中,系统发出拨号事件消息可以通知拨号 进度,因而需要提供接受消息的方式和处理消息的函数.当其值为$FFFFFFFF时,则参数handle被 
            视为一个窗口的句柄,事件消息被发生该窗口处理;当其值为0时,handle被视为TRasDialFunc类型 的函数的指针;当其值为1时,handle被视为TRasDialFunc1类型的函数的指针. 
            <br>
            &nbsp&nbsp    参数handle表示消息处理函数指针,其类型可以THandle、TRasDialFunc、TRasDialFunc1.当该 
            参数不为NULL或NIL时,其代表的消息处理函数指针将接受拨号进度通知消息;为NIL时,拨号过程由异步方式变为同步方式,直到拨号过程成功或失败后RasDial函数才返回.详细可参见Delphi帮助文件中关于RasDial函数的帮助。 
            <br>
            &nbsp&nbsp    当拨号连接成功时,lphRasConn将表示其连接句柄. <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp    函数返回值为0表示执行成功;否则为错误代码. <br>
            &nbsp&nbsp    下面是一个应用例子,按指定的拨号参数拨号. <br>
            &nbsp&nbsp <br>
            &nbsp&nbspvar <br>
            &nbsp&nbspRASDIALPARAMSData : RASDIALPARAMS; <br>
            &nbsp&nbspdwResult : DWord; <br>
            &nbsp&nbspRasCon : DWord; <br>
            &nbsp&nbspbegin <br>
            &nbsp&nbsp//指定拨号连接的拨号参数 <br>
            &nbsp&nbspwith RASDIALPARAMSData do <br>
            &nbsp&nbspbegin <br>
            &nbsp&nbspdwSize := sizeof( RASDIALPARAMS );//结构大小 <br>
            &nbsp&nbspszEntryName := '163';//指定拨号连接的名称 <br>
            &nbsp&nbspszUserName := 'MyName';//指定用户名称 <br>
            &nbsp&nbspszPassword := 'MyPassword';//指定用户密码 <br>
            &nbsp&nbspszDomain := 'MyDomain';//指定域名 <br>
            &nbsp&nbspszCallbackNumber := '';//指定回叫号码 <br>
            &nbsp&nbspszPhoneNumber := '';//指定拨号号码 <br>
            &nbsp&nbspend; <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp//用指定的拨号参数拨号,采用同步拨号方式 <br>
            &nbsp&nbspdwResult := RasDial( NIL,'',@RASDIALPARAMSData,0,NIL,RasCon 
            ); <br>
            &nbsp&nbsp <br>
            &nbsp&nbspif dwResult &lt;&gt; 0 then //设置指定拨号连接的拨号参数失败 <br>
            &nbsp&nbspmemo1.lines.add( '用'+StrPAS(RASDIALPARAMSData.szEntryName 
            )+'拨号失败:' <br>
            &nbsp&nbsp+ GetRasError( dwResult )) <br>
            &nbsp&nbspelse <br>
            &nbsp&nbspmemo1.lines.add( '用'+StrPAS(RASDIALPARAMSData.szEntryName 
            )+'拨号成功!' ); <br>
            &nbsp&nbspend; <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp  2、挂断指定的拨号连接 <br>
            &nbsp&nbsp    挂断拨号连接的RasAPI函数为RasHangUp,其函数原型为: <br>
            &nbsp&nbspfunction RasHangUp( <br>
            &nbsp&nbsphRasConn : DWORD//要挂断的拨号连接的句柄 <br>
            &nbsp&nbsp) : DWORD; stdcall; <br>
            &nbsp&nbspfunction RasHangUp;external RasApiDll name 'RasHangUpA'; 
            <br>
            &nbsp&nbsp    函数返回值为0表示执行成功;否则为错误代码. <br>
            &nbsp&nbsp    下面是一个应用例子,挂断由RasDial建立的拨号连接. <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp//挂断由RasDial建立的拨号连接 <br>
            &nbsp&nbspdwResult := RasHangUp( RasCon ); <br>
            &nbsp&nbspif dwResult &lt;&gt; 0 then //挂断失败 <br>
            &nbsp&nbspmemo1.lines.add( '挂断失败:' + GetRasError( dwResult )) <br>
            &nbsp&nbspelse <br>
            &nbsp&nbspmemo1.lines.add( '挂断成功!'); <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp五、获取当前活动的连接及其连接状态 <br>
            &nbsp&nbsp  1、获取当前活动的连接 <br>
            &nbsp&nbsp    获取当前活动的连接的RasAPI函数为RasEnumConnections,其函数原型为: <br>
            &nbsp&nbspfunction RasEnumConnections( var lprasc <br>
            &nbsp&nbsp <br>
            &nbsp&nbsp</font></td>
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<br>
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