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主要功能如下:
(1)本地网络信息的获取
计算机名称、IP地址、网卡地址、DNS设置、安装的协议、提供的服务、TCP/IP运行信息。
(2)修改本地计算机的网络设置
(3)采用ntp协议从internet上某个时间服务器,获取时间信息,准确地更新本地机时钟,支持手动、定时自动两种方式
可使用VS 2012运行此程序。
class TimeUtil
{
// 获取本地时间
public static DateTime getLocalTime()
{
SystemTime sysTime = new SystemTime();
TimeAPI.GetLocalTime(ref sysTime);
return SystemTime2DateTime(sysTime);
}
// 设置本地时间
public static bool setLocalTime(DateTime dateTime)
{
if (PrivilegeUtil.grantPrivilege(PrivilegeConstants.SE_SYSTEMTIME_NAME))
{
SystemTime sysTime = DateTime2SystemTime(dateTime);
bool success = TimeAPI.SetLocalTime(ref sysTime);
if (!PrivilegeUtil.revokePrivilege(PrivilegeConstants.SE_SYSTEMTIME_NAME))
{
Program.writeMsg("撤权失败: 更改系统时间");
}
return success;
}
Program.writeMsg("授权失败: 更改系统时间");
return false;
}
// 获取系统时间
public static DateTime getSystemTime()
{
SystemTime sysTime = new SystemTime();
TimeAPI.GetSystemTime(ref sysTime);
return SystemTime2DateTime(sysTime);
}
// 获取网络时间
public static DateTime getWebTime()
{
// default ntp server
const string ntpServer = "ntp1.aliyun.com";
// NTP message size - 16 bytes of the digest (RFC 2030)
byte[] ntpData = new byte[48];
// Setting the Leap Indicator, Version Number and Mode values
ntpData[0] = 0x1B; // LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
IPAddress[] addresses = Dns.GetHostEntry(ntpServer).AddressList;
// The UDP port number assigned to NTP is 123
IPEndPoint ipEndPoint = new IPEndPoint(addresses[0], 123);
// NTP uses UDP
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
socket.Connect(ipEndPoint);
// Stops code hang if NTP is blocked
socket.ReceiveTimeout = 3000;
socket.Send(ntpData);
socket.Receive(ntpData);
socket.Close();
// Offset to get to the "Transmit Timestamp" field (time at which the reply
// departed the server for the client, in 64-bit timestamp format."
const byte serverReplyTime = 40;
// Get the seconds part
ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
// Get the seconds fraction
ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime 4);
// Convert From big-endian to little-endian
intPart = swapEndian(intPart);
fractPart = swapEndian(fractPart);
ulong milliseconds = (intPart * 1000) ((fractPart * 1000) / 0x100000000UL);
// UTC time
DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds);
// Local time
return webTime.ToLocalTime();
}