C# 在指定的IP地址中获得一个设备的MAC（物理）地址搞代码

using System.Net;
using System.Net.NetworkInformation;

/// <summary>
/// Holds utilities for working with networks, Ethernet, etc.
/// </summary>
public static class NetworkUtils
{
    [System.Runtime.InteropServices.DllImport("iphlpapi.dll",  ExactSpelling = true)]
    static extern int SendARP(int DestIP, int SrcIP, byte[]  pMacAddr, ref int PhyAddrLen);

/// <summary>
    /// Gets the MAC address (<see cref="PhysicalAddress"/>)  associated with the specified IP.
    /// </summary>
    /// <param name="ipAddress">The remote IP address.</param>
    /// <returns>The remote machine's MAC address.</returns>
    public static PhysicalAddress GetMacAddress(IPAddress  ipAddress)
    {
        const int MacAddressLength = 6;
        int length = MacAddressLength;
        var macBytes = new byte[MacAddressLength];
        SendARP(BitConverter.ToInt32(ipAddress.GetAddressBytes(),  0), 0, macBytes, ref length);
        return new PhysicalAddress(macBytes);
    }
}

[TestClass()]
public class NetworkUtilsTests
{
    [TestMethod()]
    public void GetMacAddress_BroadcastIP_NonzeroMac()
    {
        IPAddress ipAddress = IPAddress.Broadcast;

PhysicalAddress actual = NetworkUtils.GetMacAddress(ipAddress);
        Console.WriteLine(actual.ToString());

Assert.AreNotEqual(PhysicalAddress.None, actual);
    }
}

using System.Net;

using System.Net.NetworkInformation;

/// <summary>

/// Holds utilities for working with networks, Ethernet, etc.

/// </summary>

public static class NetworkUtils

{

[System.Runtime.InteropServices.DllImport("iphlpapi.dll", ExactSpelling = true)]

static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref int PhyAddrLen);

/// <summary>

/// Gets the MAC address (<see cref="PhysicalAddress"/>) associated with the specified IP.

/// </summary>

/// <param name="ipAddress">The remote IP address.</param>

/// <returns>The remote machine's MAC address.</returns>

public static PhysicalAddress GetMacAddress(IPAddress ipAddress)

{

const int MacAddressLength = 6;

int length = MacAddressLength;

var macBytes = new byte[MacAddressLength];

SendARP(BitConverter.ToInt32(ipAddress.GetAddressBytes(), 0), 0, macBytes, ref length);

return new PhysicalAddress(macBytes);

}

[TestClass()]

public class NetworkUtilsTests

{

[TestMethod()]

public void GetMacAddress_BroadcastIP_NonzeroMac()

{

IPAddress ipAddress = IPAddress.Broadcast;

PhysicalAddress actual = NetworkUtils.GetMacAddress(ipAddress);

Console.WriteLine(actual.ToString());

Assert.AreNotEqual(PhysicalAddress.None, actual);

}

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