[DllImport("Wlanapi", EntryPoint = "WlanEnumInterfaces")]

        public static extern uint WlanEnumInterfaces([In] IntPtr hClientHandle, IntPtr pReserved, ref IntPtr ppInterfaceList);

     <DllImport("Wlanapi", EntryPoint := "WlanEnumInterfaces")> _

     Public Shared Function WlanEnumInterfaces(<[In]> ByVal hClientHandle As IntPtr, ByVal pReserved As IntPtr, ByRef ppInterfaceList As IntPtr) As UInteger

        if (WlanEnumInterfaces(handle, IntPtr.Zero, ref ptr) != 0)

     If WlanEnumInterfaces(handle, IntPtr.Zero, ptr) <> 0 Then

The constructor of this structure "unmarshal" WLAN_INTERFACE_INFO_LIST data obtained by calling WlanEnumInterfaces(). This is a good example on how to marshal pointer-to-pointer case in C++ world ( kind of confusing because in C# or Managed Environment more broadly, it is just reference, so as you can see from the implementation for C#, it is to be treated like just a single pointer case. Also, this example shows how to handle an array for the InterfaceInfo inside of this structure. It needs two level of marshaling and this example shows that.

The constructor of this structure "unmarshal" WLAN_INTERFACE_INFO_LIST data obtained by calling WlanEnumInterfaces(). This is a good example on how to marshal pointer-to-pointer case in C++ world ( kind of confusing because in C# or Managed Environment more broadly, it is just reference, so as you can see from the implementation for C#, it is to be treated like just a single pointer case. Also, this example shows how to handle an array for the InterfaceInfo inside of this structure. It needs two level of marshaling and this example shows that.