获取远程电脑的日期时间？

Question

.net 中是否有任何类可用于获取远程 PC 的日期时间？为此，我可以使用计算机名称或时区。对于每种情况，是否有不同的方法来获取当前日期时间？我使用的是 Visual Studio 2005。

Answer 1

我为您提供了一个使用 WMI 的解决方案。您可能需要也可能不需要域和安全信息：

try
{
    string pc = "pcname";
    //string domain = "yourdomain";
    //ConnectionOptions connection = new ConnectionOptions();
    //connection.Username = some username;
    //connection.Password = somepassword;
    //connection.Authority = "ntlmdomain:" + domain;

    string wmipath = string.Format("\\\\{0}\\root\\CIMV2", pc);
    //ManagementScope scope = new ManagementScope(
    //    string.Format("\\\\{0}\\root\\CIMV2", pc), connection);
    ManagementScope scope = new ManagementScope(wmipath);
    scope.Connect();

    ObjectQuery query = new ObjectQuery(
        "SELECT * FROM Win32_LocalTime");

    ManagementObjectSearcher searcher =
        new ManagementObjectSearcher(scope, query);

    foreach (ManagementObject queryObj in searcher.Get())
    {
        Console.WriteLine("-----------------------------------");
        Console.WriteLine("Win32_LocalTime instance");
        Console.WriteLine("-----------------------------------");

        Console.WriteLine("Date: {0}-{1}-{2}", queryObj["Year"], queryObj["Month"], queryObj["Day"]);
        Console.WriteLine("Time: {0}:{1}:{2}", queryObj["Hour"], queryObj["Minute"], queryObj["Second"]);
    }
}
catch (ManagementException err)
{
    Console.WriteLine("An error occurred while querying for WMI data: " + err.Message);
}
catch (System.UnauthorizedAccessException unauthorizedErr)
{
    Console.WriteLine("Connection error (user name or password might be incorrect): " + unauthorizedErr.Message);
}

Answer 2

由于 WMI 代码会非常慢，您可以使用下面的代码来获得更快的结果

            string machineName = "vista-pc";

            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.StartInfo.FileName = "net";
            proc.StartInfo.Arguments = @"time \\" + machineName;
            proc.Start();
            proc.WaitForExit();

            List<string> results = new List<string>();
            while (!proc.StandardOutput.EndOfStream)
            {
                string currentline = proc.StandardOutput.ReadLine();
                if (!string.IsNullOrEmpty(currentline))
                {
                    results.Add(currentline);
                }
            }

            string currentTime = string.Empty;
            if (results.Count > 0 && results[0].ToLower().StartsWith(@"current time at \\" +                                               machineName.ToLower() + " is "))
            {
                currentTime = results[0].Substring((@"current time at \\" + machineName.ToLower() + " is                             ").Length);

                Console.WriteLine(DateTime.Parse(currentTime));
                Console.ReadLine();
            }

Answer 3

在 Windows 计算机上，可以使用 net time \\ 来获取远程计算机的时间。您可以使用它来查找远程系统时间，如果您想要代码，您可以将其包装在函数中以在 C# 中执行 shell (DOS) 函数。

Answer 4

您可以使用远程 WMI 和 Win32_TimeZone< /代码>类。您确实需要拥有在该计算机上执行 WMI 查询的权限。通过使用 UTC 而不是当地时间来避免这样的麻烦。

Answer 5

您可以使用 pinvoke NetRemoteTOD原生API。这是一个小型 PoC。

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential)]
struct TIME_OF_DAY_INFO
{
    public uint elapsedt;
    public int msecs;
    public int hours;
    public int mins;
    public int secs;
    public int hunds;
    public int timezone;
    public int tinterval;
    public int day;
    public int month;
    public int year;
    public int weekday;
}

class Program
{
    [DllImport("netapi32.dll", CharSet = CharSet.Unicode)]
    private static extern int NetRemoteTOD(string uncServerName, out IntPtr buffer);

    [DllImport("netapi32.dll")] 
    private static extern void NetApiBufferFree(IntPtr buffer);

    internal static DateTimeOffset GetServerTime(string serverName = null)
    {
        if (serverName != null && !serverName.StartsWith(@"\\"))
        {
            serverName = @"\\" + serverName;
        }

        int rc = NetRemoteTOD(serverName, out IntPtr buffer);
        if (rc != 0)
        {
            throw new Win32Exception(rc);
        }

        try
        {
            var tod = Marshal.PtrToStructure<TIME_OF_DAY_INFO>(buffer);
            return DateTimeOffset.FromUnixTimeSeconds(tod.elapsedt).ToOffset(TimeSpan.FromMinutes(-tod.timezone));
        }
        finally
        {
            NetApiBufferFree(buffer);
        }
    }

    static void Main(string[] args)
    {
        Console.WriteLine(DateTimeOffset.Now);
        Console.WriteLine(GetServerTime());
        Console.WriteLine(GetServerTime("host1"));
        Console.WriteLine(GetServerTime("host2.domain.tld"));
        Console.ReadLine();
    }
}