c#可以实现连接和断开宽带的拨号程序吗？

ADSL自动拨号类,前提是在系统中已经有了一个宽带拨号连接
调用代码:
RASDisplay ras = new RASDisplay();
ras.Disconnect();//断线
ras.Connect("adsl");//拨号


using System;
using System.Runtime.InteropServices;
public struct RASCONN
{
public int dwSize;
public IntPtr hrasconn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=257)]
public string szEntryName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=17)]
public string szDeviceType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=129)]
public string szDeviceName;
}

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
public struct RasStats
{
public int dwSize;
public int dwBytesXmited;
public int dwBytesRcved;
public int dwFramesXmited;
public int dwFramesRcved;
public int dwCrcErr;
public int dwTimeoutErr;
public int dwAlignmentErr;
public int dwHardwareOverrunErr;
public int dwFramingErr;
public int dwBufferOverrunErr;
public int dwCompressionRatioIn;
public int dwCompressionRatioOut;
public int dwBps;
public int dwConnectionDuration;
}

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
public struct RasEntryName
{
public int dwSize;
//[MarshalAs(UnmanagedType.ByValTStr,SizeConst=(int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
public string szEntryName;
//#if WINVER5
// public int dwFlags;
// [MarshalAs(UnmanagedType.ByValTStr,SizeConst=260+1)]
// public string szPhonebookPath;
//#endif
}
public class RAS

{


[DllImport("Rasapi32.dll", EntryPoint="RasEnumConnectionsA",
SetLastError=true)]

internal static extern int RasEnumConnections
(
ref RASCONN lprasconn, // buffer to receive connections data
ref int lpcb, // size in bytes of buffer
ref int lpcConnections // number of connections written to buffer
);


[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
internal static extern uint RasGetConnectionStatistics(
IntPtr hRasConn, // handle to the connection
[In,Out]RasStats lpStatistics // buffer to receive statistics
);
[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasHangUp(
IntPtr hrasconn // handle to the RAS connection to hang up
);

[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasEnumEntries (
string reserved, // reserved, must be NULL
string lpszPhonebook, // pointer to full path and
// file name of phone-book file
[In,Out]RasEntryName[] lprasentryname, // buffer to receive
// phone-book entries
ref int lpcb, // size in bytes of buffer
out int lpcEntries // number of entries written
// to buffer
);

[DllImport("wininet.dll",CharSet=CharSet.Auto)]
public extern static int InternetDial(
IntPtr hwnd,
[In]string lpszConnectoid,
uint dwFlags,
ref int lpdwConnection,
uint dwReserved
);

public RAS()
{

}


}
public enum DEL_CACHE_TYPE //要删除的类型。
{
File,//表示internet临时文件
Cookie //表示Cookie
};
public class RASDisplay
{
[DllImport("wininet.dll",CharSet=CharSet.Auto)]
public static extern bool DeleteUrlCacheEntry(
DEL_CACHE_TYPE type
);
private string m_duration;
private string m_ConnectionName;
private string[] m_ConnectionNames;
private double m_TX;
private double m_RX;
private bool m_connected;
private IntPtr m_ConnectedRasHandle;

RasStats status = new RasStats();
public RASDisplay()
{
m_connected = true;

RAS lpras = new RAS();
RASCONN lprasConn = new RASCONN();

lprasConn.dwSize = Marshal.SizeOf(typeof(RASCONN));
lprasConn.hrasconn = IntPtr.Zero;

int lpcb = 0;
int lpcConnections = 0;
int nRet = 0;
lpcb = Marshal.SizeOf(typeof(RASCONN));


nRet = RAS.RasEnumConnections(ref lprasConn, ref lpcb, ref
lpcConnections);


if(nRet != 0)

{
m_connected = false;
return;

}

if(lpcConnections > 0)
{


//for (int i = 0; i < lpcConnections; i++)

//{
RasStats stats = new RasStats();

m_ConnectedRasHandle = lprasConn.hrasconn;
RAS.RasGetConnectionStatistics(lprasConn.hrasconn, stats);


m_ConnectionName = lprasConn.szEntryName;

int Hours = 0;
int Minutes = 0;
int Seconds = 0;

Hours = ((stats.dwConnectionDuration /1000) /3600);
Minutes = ((stats.dwConnectionDuration /1000) /60) - (Hours * 60);
Seconds = ((stats.dwConnectionDuration /1000)) - (Minutes * 60) - (Hours * 3600);


m_duration = Hours + " hours " + Minutes + " minutes " + Seconds + " secs";
m_TX = stats.dwBytesXmited;
m_RX = stats.dwBytesRcved;


//}


}
else
{
m_connected = false;
}


int lpNames = 1;
int entryNameSize = 0;
int lpSize = 0;
RasEntryName[] names = null;

entryNameSize=Marshal.SizeOf(typeof(RasEntryName));
lpSize=lpNames*entryNameSize;

names=new RasEntryName[lpNames];
names[0].dwSize=entryNameSize;

uint retval = RAS.RasEnumEntries(null,null,names,ref lpSize,out lpNames);

//if we have more than one connection, we need to do it again
if(lpNames > 1)
{
names=new RasEntryName[lpNames];
for(int i=0;i<names.Length;i++)
{
names[i].dwSize=entryNameSize;
}

retval = RAS.RasEnumEntries(null,null,names,ref lpSize,out lpNames);

}
m_ConnectionNames = new string[names.Length];


if(lpNames>0)
{
for(int i=0;i<names.Length;i++)
{

m_ConnectionNames[i] = names[i].szEntryName;

}
}
}

public string Duration
{
get
{
return m_connected ? m_duration : "";
}
}

public string[] Connections
{
get
{
return m_ConnectionNames;
}
}

public double BytesTransmitted
{
get
{
return m_connected ? m_TX : 0;
}
}
public double BytesReceived
{
get
{
return m_connected ? m_RX : 0;

}
}
public string ConnectionName
{
get
{
return m_connected ? m_ConnectionName : "";
}
}
public bool IsConnected
{
get
{
return m_connected;
}
}

public int Connect(string Connection)
{
int temp = 0;
uint INTERNET_AUTO_DIAL_UNATTENDED = 2;
int retVal = RAS.InternetDial(IntPtr.Zero,Connection,INTERNET_AUTO_DIAL_UNATTENDED,ref temp,0);
return retVal;
}
public void Disconnect()
{
RAS.RasHangUp(m_ConnectedRasHandle);
}
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

最简单的方法：使用RasDial命令
RasDial是Windows自带的命令，使用非常简单。实际使用是可将下面代码保存为一个批处理文件，然后直接运行或在程序里进行调用。

rasdial.exe /disconnect '断开连接
del "C:/Documents and Settings/hyuqin/Cookies/*.*" /Q '清除Cookie
rasdial.exe 连接名 连接账户 连接密码 '重新拨号

 

 

在c#中实现ADSL拨号连接有两种方法：

1、使用windows的api函数来实现（当然是RAS函数）。// 上面的代码

2、调用windows的拨号连接来实现。这两种方

式各有利弊。方法一中有用户拨号界面的开发，方法二则不需要，下面是方法二的实现，实现的原理是在另一进程中调用windows的

rasphone.exe。rasphone是windows的拨号连接程序。
using System.Diagnostics; //先引入namespace
using Microsoft.Win32;
//从注册表中取出系统可用的拨号连接
RegistryKey UserKey = Registry.CurrentUser;
RegistryKey Key = UserKey.OpenSubKey(@"RemoteAccess/Profile");
string[] KeysList = Key.GetSubKeyNames();
string Connection＝KeysList[0]; //这里假设只有一个拨号连接，也许有多个了，Connection变量下面用.

//1.得到rasphone.exe的全路径
string WinDir = Environment.GetFolderPath(Environment.SpecialFolder.System);
string file = @"/rasphone.exe ";
string FileName = WinDir + file;
//2.在进程中调用，变量Connection为windows中的adsl连接的名称，在网上邻居－> 属性中可以看到，也就是上面取到的
string args="";
args = "-d " +"/"" + Connection +"/""; //注意当连接时用这句
// args = "-h " +"/"" + Connection + "/""; //注意当断开时用这句
Process myProcess = new Process();
ProcessStartInfo Adsl = new ProcessStartInfo();
Adsl.FileName = FileName;
myProcess.StartInfo = Adsl;
Adsl.Arguments = args;
myProcess.Start();
这样就会出现拨号连接的窗口。

 

rasphone的用法可以用rasphone －h 看到。
在好多地方看到可以用rasphone "-ld " +"/"" + Connection +"/"" 实现自动拨号，但是我测试却报如下的错误，不知为何？

 

出现拨号连接的窗口是不会自动拨号的，实现此处的自动拨号在后面研究

 

rasdial.exe /disconnect '断开连接
del "C:/Documents and Settings/hyuqin/Cookies/*.*" /Q '清除Cookie
rasdial.exe 连接名 连接账户 连接密码 '重新拨号

class AutoDialer
{
public void Connect(string connectionName, string user, string pass)
{
string arg = string.Format("rasdial /"{0}/" {1} {2}", connectionName, user, pass);
InvokeCmd(arg);
}

public void Disconnect(string connectionName)
{
string arg = string.Format("rasdial /"{0}/" /disconnect", connectionName);
InvokeCmd(arg);
}

private static string InvokeCmd(string cmdArgs)
{
Process p = new Process();
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.CreateNoWindow = true;
p.Start();

p.StandardInput.WriteLine(cmdArgs);
p.StandardInput.WriteLine("exit");

return p.StandardOutput.ReadToEnd();
}
}