原帖地址：http://www.cnblogs.com/guozk/archive/2010/04/07/1705951.html

 

在网络编程中,有时候会需要重新拨号建立网络连接(如Ad点击软件通过重新拨号形成有效点击) ,下面介绍两种程序中拨号的方法.

1、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

2、封装为类，灵活调用
上面提到的方法虽然很简单，但并非标准的实现方法，使用时会受到一些限制，此时最好的办法就是将实现代码封装为类库。下面这个类库是网上一位朋友提供的,直接调用就行.

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);
    }
}

调用方法:

RASDisplay ras = new RASDisplay();
ras.Disconnect();//断开连接
ras.Connect("ADSL");//重新拨号

 

 

哦，我晕。原来这样子就可以了。。
就不用弹框框了。。无语啊
1、右击“网上邻居”--属性；
2、在随后出现的“宽带连接”窗口中，右击宽带连接，单击“属性”；
3、在随后出现的属性对话框中，单击“选项”；
4、把随后出现的“提示名称、密码和证书等”前面的对号去掉，点“确定”退出；