Use sendarp to obtain the MAC address

This document uses two methods to obtain the MAC address.

1.

Only Local.

Using system. Management;

 

Managementclass MC = new managementclass ("win32_networkadapterconfiguration"); managementobjectcollection moc2 = MC. getinstances (); foreach (managementobject Mo in moc2) {If (bool) Mo ["ipenabled"] = true) This. textbox1.text = Mo ["macaddress"]. tostring (); Mo. dispose ();

}

2. This method can obtain the remote MAC address.

Using system. runtime. interopservices;

[Dllimport ("iphlpapi. DLL ")] Static extern int sendarp (int32 destip, int32 srcip, ref int64 macaddr, ref int32 phyaddrlen); [dllimport (" ws2_32.dll ")] static extern int32 inet_addr (string ipaddr ); /// <summary> /// obtain the MAC address through sendarp /// </Summary> /// <Param name = "remoteip"> the IP address of the target machine, for example, 192.168.1.1) </param> // <returns> MAC address of the target machine </returns> Public static string getmacaddress (string remoteip) {stringbuilder macaddress = new stringbuilder (); try {int32 remote = inet_addr (remoteip); int64 macinfo = new int64 (); int32 length = 6; sendarp (remote, 0, ref macinfo, ref length ); string temp = convert. tostring (macinfo, 16 ). padleft (12, '0 '). toupper (); int x = 12; For (INT I = 0; I <6; I ++) {if (I = 5) {macaddress. append (temp. substring (X-2, 2);} else {macaddress. append (temp. substring (X-2, 2) + "-");} X-= 2;} return macaddress. tostring ();} catch {return macaddress. tostring ();}}