C# Signature:
[DllImport("Iphlpapi.dll", CharSet = CharSet.Auto)]
public static extern int IpReleaseAddress(ref IP_ADAPTER_INDEX_MAP AdapterInfo);
User-Defined Types:
None.
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
The following C# sourcecode implements classes and structures with the purpose of making the use of GetInterfaceInfo and IpReleaseAddress easier. Thanks to Lieutenant (http://www.red-gate.com/MessageBoard/viewtopic.php?t=5754) for submitting this code.
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct IP_ADAPTER_INDEX_MAP
{
public int Index;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = PInvokes.MAX_ADAPTER_NAME)]
public String Name;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct IP_INTERFACE_INFO
{
public int NumAdapters;
public IP_ADAPTER_INDEX_MAP[] Adapter;
public static IP_INTERFACE_INFO FromByteArray(Byte[] buffer)
{
unsafe
{
IP_INTERFACE_INFO rv = new IP_INTERFACE_INFO();
int iNumAdapters = 0;
Marshal.Copy(buffer, 0, new IntPtr(&iNumAdapters), 4);
IP_ADAPTER_INDEX_MAP[] adapters = new IP_ADAPTER_INDEX_MAP[iNumAdapters];
rv.NumAdapters = iNumAdapters;
rv.Adapter = new IP_ADAPTER_INDEX_MAP[iNumAdapters];
int offset = sizeof(int);
for (int i = 0; i < iNumAdapters; i++)
{
IP_ADAPTER_INDEX_MAP map = new IP_ADAPTER_INDEX_MAP();
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(map));
Marshal.StructureToPtr(map, ptr, false);
Marshal.Copy(buffer, offset, ptr, Marshal.SizeOf(map));
map = (IP_ADAPTER_INDEX_MAP)Marshal.PtrToStructure(ptr, typeof(IP_ADAPTER_INDEX_MAP));
Marshal.FreeHGlobal(ptr);
rv.Adapter[i] = map;
offset += Marshal.SizeOf(map);
}
return rv;
}
}
}
internal class PInvokes
{
public const int MAX_ADAPTER_NAME = 128;
public const int ERROR_INSUFFICIENT_BUFFER = 122;
public const int ERROR_SUCCESS = 0;
[DllImport("Iphlpapi.dll", CharSet = CharSet.Auto)]
public static extern int GetInterfaceInfo(Byte[] PIfTableBuffer, ref int size);
[DllImport("Iphlpapi.dll", CharSet = CharSet.Auto)]
public static extern int IpReleaseAddress(ref IP_ADAPTER_INDEX_MAP AdapterInfo);
}
public class Iphlpapi
{
public static IP_INTERFACE_INFO GetInterfaceInfo()
{
int size = 0;
int r = PInvokes.GetInterfaceInfo(null, ref size);
Byte[] buffer = new Byte[size];
r = PInvokes.GetInterfaceInfo(buffer, ref size);
if (r != PInvokes.ERROR_SUCCESS)
throw new Exception("GetInterfaceInfo returned an error.");
IP_INTERFACE_INFO info = IP_INTERFACE_INFO.FromByteArray(buffer);
return info;
}
public static bool IpReleaseAddress(IP_ADAPTER_INDEX_MAP adapter)
{
if (PInvokes.IpReleaseAddress(ref adapter) == PInvokes.ERROR_SUCCESS)
return true;
else
return false;
}
public static void IpReleaseAllAddresses()
{
IP_INTERFACE_INFO info = GetInterfaceInfo();
for (int i = 0; i < info.NumAdapters; i++)
IpReleaseAddress(info.Adapter[i]);
}
}
