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rasdial (rasapi32)
 
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Summary
The RasDial function establishes a RAS connection between a RAS client and a RAS server. The connection data includes callback and user-authentication information.

C# Signature:

[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
static extern uint RasDial([In]RASDIALEXTENSIONS lpRasDialExtensions, [In]string lpszPhonebook, [In]RASDIALPARAMS lpRasDialParams, uint dwNotifierType, Delegate lpvNotifier, ref IntPtr lphRasConn);

VB Signature:

     VB.NET,   :)

User-Defined Types:

    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    internal struct RASEAPINFO
    {
        public int sizeOfEapData;
        public IntPtr eapData;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal class RASDIALEXTENSIONS
    {
        public readonly int dwSize = Marshal.SizeOf(typeof(RASDIALEXTENSIONS));
        public uint dwfOptions = 0;
        public int hwndParent = 0;
        public int reserved = 0;
        public int reserved1 = 0;
        public RASEAPINFO RasEapInfo = new RASEAPINFO();
    }

    [StructLayout(LayoutKind.Sequential,CharSet = CharSet.Auto)]
    internal class RASDIALPARAMS
    {
        public int dwSize = Marshal.SizeOf(typeof(RASDIALPARAMS));
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.RAS_MaxEntryName+1)]
        public string szEntryName = null;
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.RAS_MaxPhoneNumber+1)]
        public string szPhoneNumber = null;
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.RAS_MaxCallbackNumber+1)]
        public string szCallbackNumber = null;
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.UNLEN+1)]
        public string szUserName = null;
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.PWLEN+1)]
        public string szPassword = null;
        [MarshalAs(UnmanagedType.ByValTStr,SizeConst =
            (int) RasFieldSizeConstants.DNLEN+1)]
        public string szDomain = null;
        public int dwSubEntry = 0;
        public int dwCallbackId = 0;
    }

Notes:

Tips & Tricks:

Sample Code:

Alternative Managed API:

http://www.codeplex.com/DotRas - The RasDialer component in the project exposes the functionality available through the RasDial API.

Documentation

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