RASの切断方法
に書いてあるとおり。
呼び出し
RasConn.CloseAllConnections();
—————–
using System;
using System.Runtime.InteropServices;
namespace Uchukamen.WZero3
{
/// <summary>
/// This class is based on code from "mikinder".
///
http://www.developersdex.com/vb/message.asp?p=2916&r=5643969 /// </summary>
class RasConn
{
const int MAX_PATH = 260;
const int RAS_MaxDeviceType = 16;
const int RAS_MaxPhoneNumber = 128;
const int RAS_MaxEntryName = 20;
const int RAS_MaxDeviceName = 128;
const int SUCCESS = 0;
const int ERROR_NOT_ENOUGH_MEMORY = 8;
const int RASBASE = 600;
const int ERROR_BUFFER_TOO_SMALL = RASBASE + 3;
const int ERROR_INVALID_SIZE = RASBASE + 32;
#region DllImport
//// — RASCONN data structure definition (refer to ras.h) —
//private const int RAS_MaxEntryName = 20;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct RASCONN
{
public int dwSize;
public IntPtr hrasconn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxEntryName + 1)]
public string szEntryName;
}
// ——————————————–
[DllImport("coredll.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern uint RasEnumConnections(
[In, Out] RASCONN[] rasconn,
[In, Out] ref int cb,
[Out] out int connections);
[DllImport("coredll.dll")]
private static extern uint RasHangUp(IntPtr pRasConn);
#endregion
/// <summary>
/// Returns all active RAS connections as an array of data structure RASCONN
/// </summary>
/// <returns></returns>
public static RASCONN[] GetAllConnections()
{
RASCONN[] tempConn = new RASCONN[1];
RASCONN[] allConnections = tempConn;
tempConn[0].dwSize = Marshal.SizeOf(typeof(RASCONN));
int lpcb = tempConn[0].dwSize;
int lpcConnections = 0;
uint ret = RasEnumConnections(tempConn, ref lpcb, out lpcConnections);
if (ret == ERROR_INVALID_SIZE)
{
throw new Exception("RAS: RASCONN data structure has invalid format");
}
else if (ret == ERROR_BUFFER_TOO_SMALL && lpcb != 0)
{
// first call returned that there are more than one connections
// and more memory is required
allConnections = new RASCONN[lpcb / Marshal.SizeOf(typeof(RASCONN))];
allConnections[0] = tempConn[0];
ret = RasEnumConnections(allConnections, ref lpcb, out lpcConnections);
}
// Check errors
if (ret != SUCCESS)
{
throw new Exception("RAS returns error: " + ret);
}
if (lpcConnections > allConnections.Length)
{
throw new Exception("RAS: error retrieving correct connection count");
}
else if (lpcConnections == 0)
{
// if there are no connections resize the data structure
allConnections = new RASCONN[0];
}
return allConnections;
}
/// <summary>
/// Closes all active RAS connections
/// </summary>
/// <returns></returns>
public static void CloseAllConnections()
{
RASCONN[] connections = GetAllConnections();
for (int i = 0; i < connections.Length; ++i)
{
RasHangUp(connections[i].hrasconn);
}
}
}
}
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