两种方法
第一种、使用DOS命令（即时生效）
第二种、修改注册表（重启生效）
1、打开SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkCards
RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards",0,KEY_READ,&hKey)
2、取出打开注册表下的所有子键
RegEnumKeyEx(hKey,dwIndex++,szSubKey,&dwBufSize,NULL,NULL,NULL,NULL)
3、打开子键
RegOpenKeyEx(hKey,szSubKey,0,KEY_READ,&hSubKey)
4、得到网卡的ServiceName
RegQueryValueEx(hSubKey,"ServiceName",0,&dwDataType,szData,&dwBufSize)
5、根据网卡ServiceName打开新注册表
RegOpenKeyEx(HKEY_LOCAL_MACHINE,“SYSTEM\\CurrentControlSet\\services\\”+szData+"\\Parameters\\Tcpip",0,KEY_ALL_ACCESS,&hLocalKey)
6、修改本机网络信息
//IP
RegSetValueEx(hLocalKey,"IPAddress",0,type_ip,"192.168.123.123",dwIPSize)
//SubnetMask
RegSetValueEx(hLocalKey,"SubnetMask",0,type_SubnetMask,"255.255.255.0",dwSubnetMaskSize)
//GateWay
RegSetValueEx(hLocalKey,"DefaultGateway",0,type_GateWay,"192.168.12.1",dwGateWaySize)
