C# Signature:
[DllImport("iphlpapi.dll", ExactSpelling=true)]
public static extern int SendARP(
uint DestIP, uint SrcIP, byte[] pMacAddr, ref int PhyAddrLen);
VB Signature:
Declare Function SendARP Lib "iphlpapi.dll" (
ByVal DestIP As UInt32, ByVal SrcIP As UInt32, _
ByVal pMacAddr As Byte(), ByRef PhyAddrLen As Integer) As Integer
User-Defined Types:
None.
Notes:
SendARP returns 0 on success. The parameter SrcIP can be 0.
Tips & Tricks:
Please add some!
The DestIP and SrcIP arguments should be UInt32 to avoid System.OverflowException when the last nibble of the IP-address is .128 or greater.
Sample Code:
This code help to get the MAC Address of a network card (You need to know the IP address)
Public Shared Function GetMAC(ByVal IPAddress A
Dim addr As IPAddress = IPAddress.Parse(IPAddress)
Dim mac() As Byte = New Byte(6) {}
Dim len As Integer = mac.Length
SendARP(CType(addr.Address, UInt32), 0, mac, len)
Dim macAddress As String = BitConverter.ToString(mac, 0, len)
Return macAddress
End Function
This is a similar C# sample
IPAddress dst = IPAddress.Parse(
// Please do not use the IPAddress.Address property
// This API is now obsolete. --> http://msdn.microsoft.com/en-us/library/system.net.ipaddress.address.aspx
// to get the IP in Integer mode use
uint uintAddress = BitConverter.ToUInt32(dst.GetAddressBytes(), 0);
byte[] macAddr = new byte[6];
int macAddrLen = macAddr.Length;
int retValue = SendARP(uintAddress, 0, macAddr, ref macAddrLen);
if (retValue != 0) {
throw new Win32Exception(retValue, "SendARP failed.");
}
string[] str = new string[(int)macAddrLen];
for (int i = 0; i < macAddrLen; i++)
str[i] = macAddr[i].ToString("x2");
Console.WriteLine(string.Join(":", str));
Alternative Managed API:
Do you know one? Please contribute it!
in vb: because of "Public Overloads Property Address As Long This property has been deprecated." Hope this is helpful for someone!
Public Shared Function GetMAC(ByVal IPAddresse As String) As String
Dim macAddress = ""
Dim dst As IPAddress = Net.IPAddress.Parse(IPAddresse)
Dim uintAddress = BitConverter.ToUInt32(dst.GetAddressBytes(), 0)
Dim macAddr() As Byte = New Byte(6) {}
Dim macAddrLen As Integer = macAddr.Length
Dim retValue = SendARP(uintAddress, 0, macAddr, macAddrLen)
Dim str(macAddrLen) ' = New String(macAddrLen).ToString
For i = 0 To macAddrLen - 1
macAddress = macAddress & macAddr(i).ToString("x2") & ":"
Next
macAddress = Mid(macAddress, 1, Len(macAddress) - 1)
Return macAddress
End Function
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