pinvoke.net: Edit: iphlpapi.GetIfTable

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Summary: P/ invoque for GetIfTable iphlpapi function. Only C# example. You need also a MIB_IFROW structure

!!!!C# Signature:
        /// <summary>
        /// Get the information about the current Network adapter in the system
        /// </summary>
        /// <param name="pIfTable">A pointer to a buffer that receives the interface table as a MIB_IFTABLE structure</param>
        /// <param name="pdwSize">
        /// size of buffer
        /// On input, specifies the size in bytes of the buffer pointed to by the pIfTable parameter.
        /// On output, if the buffer is not large enough to hold the returned interface table,
        ///  the function sets this parameter equal to the required buffer size in bytes
        /// </param>
        /// <param name="bOrder">
        /// sort the table by index
        /// A Boolean value that specifies whether the returned interface table should be sorted 
        /// in ascending order by interface index. If this parameter is TRUE, the table is sorted.
        /// </param>
        /// <returns>
        /// If the function succeeds, the return value is 
        /// NO_ERROR = 0
        /// ERROR_INSUFFICIENT_BUFFER = 122
        /// </returns>
        [DllImport("Iphlpapi.dll", SetLastError=true)]
        public static extern uint GetIfTable(IntPtr pIfTable, ref uint pdwSize, bool bOrder);
!!!!VB Signature:
 Declare Function GetIfTable Lib "iphlpapi.dll" (TODO) As TODO
!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

!!!!Notes:
None.

!!!!Tips & Tricks:
Get if Table Wrapper Class
 /// <summary>
    /// Wrapper to unmanaged code. to use all in C# declarations
    /// </summary>
    public class IPHelperWrapper
    {
        #region  fields
        /// <summary>
        /// MIB_IFROW Declaration
        /// </summary>
        protected static IPHelperTraslation.MIB_IFROW netWorkInfoBlock;

/// <summary>
        /// MIB_IFROW structure array. Content the active networks connection
        /// </summary>
        public static IPHelperTraslation.MIB_IFROW[] mRows;
        #endregion

#region Wrapper Method
        /// <summary>
        /// Get the Active Interface networks in an array of MIB_IFROW.
        /// each network comes in a row. See MIB_IFROW in IPHelper Traslation for more 
        /// information about MIB_IFROW
        /// </summary>
        /// <returns>
        /// A array of MIB_IFROW structure
        /// </returns>
        public static IPHelperTraslation.MIB_IFROW[] GetNetworkInterfaceBlock()
        {

uint size = 0;
            IPHelperTraslation.GetIfTable(IntPtr.Zero, ref size, false);
            IntPtr buf = Marshal.AllocHGlobal((int)size);
            IPHelperTraslation.GetIfTable(buf, ref size, false);
            int numEntries = Marshal.ReadInt32(buf);
            int pRows = 4 + (int)buf;
            mRows = new IPHelperTraslation.MIB_IFROW[numEntries];
            for (int i = 0; i < numEntries; i++)
            {
                mRows[i] = (IPHelperTraslation.MIB_IFROW)Marshal.PtrToStructure((IntPtr)pRows, typeof(IPHelperTraslation.MIB_IFROW));
                pRows += Marshal.SizeOf(typeof(IPHelperTraslation.MIB_IFROW));
            }
            Marshal.FreeHGlobal(buf);
            return mRows;

}
        #endregion
    }

Documentation: GetIfTable@msdn on MSDN