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RasDialming令
RasDial是Windows自带的ming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++)
//{
names.dwSize = entryNameSize;
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.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 = names.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
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