C# Signature:
[DllImport("rasapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern int RasEnumConnections(
[In, Out] RASCONN[] rasconn,
[In, Out] ref int cb,
[Out] out int connections);
VB Signature:
TODO
User-Defined Types:
const int RAS_MaxEntryName = 256;
const int RAS_MaxDeviceType = 16;
const int RAS_MaxDeviceName = 128;
const int MAX_PATH = 260;
const int ERROR_BUFFER_TOO_SMALL = 603;
const int ERROR_SUCCESS = 0;
[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
public struct RASCONN
{
public int dwSize;
public IntPtr hrasconn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxEntryName)]
public string szEntryName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceType)]
public string szDeviceType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceName)]
public string szDeviceName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
public string szPhonebook;
public int dwSubEntry;
public Guid guidEntry;
public int dwFlags;
public Guid luid;
}
Notes:
I don't known why SizeConst = RAS_MaxEntryName, not SizeConst = RAS_MaxEntryName + 1 as in ras.h, but this work.
(also szDeviceType and szDeviceName shall be + 1).
Check my English, please
Sample Code:
This is main concept only:
// create 1 item array.
RAW.RASCONN[] connections = new RAW.RASCONN[1];
connections[0].dwSize = Marshal.SizeOf(typeof(RAW.RASCONN));
//Get entries count
int connectionsCount = 0;
int cb = Marshal.SizeOf(typeof(RAW.RASCONN));
int nRet = RAW.RasEnumConnections(connections, ref cb, out connectionsCount);
if (nRet != RAW.ERROR_SUCCESS && nRet != RAW.ERROR_BUFFER_TOO_SMALL)
throw new Win32Exception(nRet);
if (connectionsCount == 0)
return;
// create array with specified entries number
connections = new RAW.RASCONN[connectionsCount];
for (int i = 0; i < connections.Length; i++)
{
connections[i].dwSize = Marshal.SizeOf(typeof(RAW.RASCONN));
}
nRet = RAW.RasEnumConnections(connections, ref cb, out connectionsCount);
if (nRet != RAW.ERROR_SUCCESS)
throw new Win32Exception((int)nRet);
An alternative sample (Windows Vista or later) based on http://msdn.microsoft.com/en-us/library/aa377284(VS.85).aspx
int cb = 0, connectionCount;
if (RAW.RasEnumConnections(null, ref cb, out connectionCount) == RAW.ERROR_BUFFER_TOO_SMALL)
{
if (connectionCount == 0) return;
RAW.RASCONN[] buffer = new RAW.RASCONN[conns];
buffer[0].dwSize = Marshal.SizeOf(typeof(RAW.RASCONN));
if (RasApi.RasEnumConnections(buffer, ref cb, out conns) == RAW.ERROR_SUCCESS)
{
// look through the buffer...
}
}
Alternative Managed API:
http://www.codeplex.com/DotRas
