c# - 我怎样才能将时间与 WM 上的互联网资源同步？

Question

在 Windows 应用程序中，我使用 w32tm 强制计算机将时间与特定时间资源同步。但现在我正在 WM5.0 上做一个 PDA 应用程序，w32tm 不再可用，在谷歌上搜索了一下后不知道如何开始。

Answer 1

Here is a good example .

为了完整性，这里是博客文章中的代码:

public DateTime GetNTPTime()
{
    // 0x1B == 0b11011 == NTP version 3, client - see RFC 2030
    byte[] ntpPacket = new byte[] { 0x1B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

    IPAddress[] addressList = Dns.GetHostEntry("pool.ntp.org").AddressList;

    if (addressList.Length == 0)
    {
        // error
        return DateTime.MinValue;
    }

    IPEndPoint ep = new IPEndPoint(addressList[0], 123);
    UdpClient client = new UdpClient();
    client.Connect(ep);
    client.Send(ntpPacket, ntpPacket.Length);
    byte[] data = client.Receive(ref ep);

    // receive date data is at offset 32
    // Data is 64 bits - first 32 is seconds - we'll toss the fraction of a second
    // it is not in an endian order, so we must rearrange
    byte[] endianSeconds = new byte[4];
    endianSeconds[0] = data[32 + 3];
    endianSeconds[1] = data[32 + 2];
    endianSeconds[2] = data[32 + 1];
    endianSeconds[3] = data[32 + 0];
    uint seconds = BitConverter.ToUInt32(endianSeconds, 0);

    return (new DateTime(1900, 1, 1)).AddSeconds(seconds);
}