使用C#实现ADSL自动拨号

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