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Network Adapter MAC / IP Address Info Display Application Using C# and .NET

, 14 Aug 2007
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Network Adapter MAC / IP Address Info Display Application in C# .NET

Sample Image - AdapterInfo.jpg

Introduction

The AdapterInfo project is a simple C# .NET project that will report the "friendly" adapter name, the IP address assigned, and the physical (MAC) address for the user. This is helpful when an application needs to retrieve the MAC address for a certain IP address, or vice versa, when having only one piece of the puzzle. The project also demonstrates simple registry reads.

Project highlights

I found it advantageous to write this application because of the fact that the MAC address of a network adapter is not stored in an easy to get to location, such as the Registry. So, I needed a mechanism to connect the IP address of an adapter to the MAC address of it. Once the two are "matched", I then have the MAC address for my use. This is done by retrieving the "AdapterName" field form the IP_Adapter_Addresses data structure.

IntPtr PAdaptersAddresses = new IntPtr();
bool AdapterFound = false;
uint pOutLen = 100;

PAdaptersAddresses = Marshal.AllocHGlobal(100);
uint ret = GetAdaptersAddresses(0, 0, (IntPtr)0, 
               PAdaptersAddresses, ref pOutLen);

// if 111 error, use 
if (ret == 111)
{
    Marshal.FreeHGlobal(PAdaptersAddresses);
    PAdaptersAddresses = Marshal.AllocHGlobal((int) pOutLen);
    ret = GetAdaptersAddresses(0, 0, (IntPtr)0, 
                               PAdaptersAddresses, ref pOutLen);
}

IP_Adapter_Addresses adds = new IP_Adapter_Addresses();
IntPtr pTemp = PAdaptersAddresses;
IntPtr pTempIP = new IntPtr();

while (pTemp != (IntPtr)0)
{
    Marshal.PtrToStructure(pTemp, adds);
    string adapterName = Marshal.PtrToStringAnsi(adds.AdapterName);
    string FriendlyName = Marshal.PtrToStringAuto(adds.FriendlyName);
    string tmpString = string.Empty;
    for (int i = 0; i < 6; i++)
    {
        tmpString += string.Format("{0:X2}", adds.PhysicalAddress[i]);
        if (i < 5)
        {
            tmpString += ":";
        }
    }

    RegistryKey theLocalMachine = Registry.LocalMachine; 
    RegistryKey theSystem = theLocalMachine.OpenSubKey(@"SYSTEM\Current" + 
                            @"ControlSet\Services\Tcpip\Parameters\Interfaces"); 
    RegistryKey theInterfaceKey = theSystem.OpenSubKey(adapterName); 

    if (theInterfaceKey != null)
    {
        string DhcpIPAddress = (string)theInterfaceKey.GetValue("DhcpIPAddress");
        // system is using DHCP
        if (DhcpIPAddress != null)
        {
            string tArray = (string)
            theInterfaceKey.GetValue("DhcpIPAddress", theInterfaceKey);
            AdapterInfoTextBox.Text += "Network adapter: " + 
                                       FriendlyName.ToString() + "\r\n";
            AdapterInfoTextBox.Text += "IP Address: " + tArray + "\r\n";
            AdapterInfoTextBox.Text += "MAC Address: " + tmpString + "\r\n\r\n";
            AdapterFound = true;
        }
        else
        {
            string[] tArray = (string[])
            theInterfaceKey.GetValue("IPAddress", theInterfaceKey);
            AdapterInfoTextBox.Text += "Network adapter: " + 
                                       FriendlyName.ToString() + "\r\n";
            for (int Interface = 0; Interface < tArray.Length; Interface++)
            {
                AdapterInfoTextBox.Text += "IP Address: " + 
                                           tArray[Interface] + "\r\n";
                AdapterFound = true;
            }
            AdapterInfoTextBox.Text += "MAC Address: " + tmpString + "\r\n\r\n";
        }
    }
    pTemp = adds.Next;
}

if (AdapterFound != true)
{
    AdapterInfoTextBox.Text += "No network adapters configured/present\r\n";
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Brian Riek
Engineer
United States United States
Wisconsin native enjoying the lack of snow and cold weather in Arizona!
 
Device driver and application development for most OSes.
 
brian.d.riek@gmail.com

Comments and Discussions

 
GeneralMy vote of 1 Pinmembervinu ep14-Apr-13 23:07 
Questionget inf from network card only Pinmemberimans6222-Jun-10 20:33 
GeneralThe recommended method of calling the GetAdaptersAddresses... PinmemberJeffrey Walton2-Jun-10 10:57 
Generali am not getting the exact ip address PinmemberGop'z14-Aug-07 2:19 
GeneralRe: i am not getting the exact ip address PinmemberBrian D. Riek14-Aug-07 8:33 
GeneralRe: i am not getting the exact ip address PinmemberBrian D. Riek10-Oct-07 14:05 
GeneralEasier way PinmemberGarth Watkins6-Mar-07 23:26 
GeneralRe: Easier way PinmemberBrian D. Riek23-Apr-07 9:47 
GeneralRe: Easier way Pinmemberlextm9-Jul-07 21:36 
GeneralRe: Easier way PinmemberBrian D. Riek19-Jul-07 6:18 
GeneralThanx! this is Simple but useful article Pinmemberhackrogenius30-Dec-06 21:13 
GeneralRe: Thanx! this is Simple but useful article PinmemberGop'z13-Aug-07 23:25 

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