adsl 自动拨号类 源码

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.SequentialCharSet=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.SequentialCharSet=CharSet.Auto）]
public struct RasEntryName
{
public int dwSize;
//[Ma