首先，我們來看看一個(gè)網(wǎng)站：國家授時(shí)中心（http://www.time.ac.cn/stime.asp），這個(gè)是應(yīng)該是時(shí)間的權(quán)威機(jī)構(gòu)，里面有各國各地的時(shí)間，我們可以通過同步該時(shí)間來實(shí)現(xiàn)系統(tǒng)時(shí)間的更新。首先分兩步，一步是獲取“國家授時(shí)中心”的時(shí)間，一步是更新系統(tǒng)時(shí)間。下面的代碼就是做這些工作。
#region 獲取網(wǎng)絡(luò)時(shí)間
/// <summary>
/// 獲取中國國家授時(shí)中心網(wǎng)絡(luò)服務(wù)器時(shí)間發(fā)布的當(dāng)前時(shí)間
/// </summary>
/// <returns></returns>
public static DateTime GetChineseDateTime()
{
DateTime res = DateTime.MinValue;
try
{
string url = "http://www.time.ac.cn/stime.asp";
HttpHelper helper = new HttpHelper();
helper.Encoding = Encoding.Default;
string html = helper.GetHtml(url);
string patDt = @"\d{4}年\d{1,2}月\d{1,2}日";
string patHr = @"hrs\s+=\s+\d{1,2}";
string patMn = @"min\s+=\s+\d{1,2}";
string patSc = @"sec\s+=\s+\d{1,2}";
Regex regDt = new Regex(patDt);
Regex regHr = new Regex(patHr);
Regex regMn = new Regex(patMn);
Regex regSc = new Regex(patSc);
res = DateTime.Parse(regDt.Match(html).Value);
int hr = GetInt(regHr.Match(html).Value, false);
int mn = GetInt(regMn.Match(html).Value, false);
int sc = GetInt(regSc.Match(html).Value, false);
res = res.AddHours(hr).AddMinutes(mn).AddSeconds(sc);
}
catch { }
return res;
}
/// <summary>
/// 從指定的字符串中獲取整數(shù)
/// </summary>
/// <param name="origin">原始的字符串</param>
/// <param name="fullMatch">是否完全匹配，若為false，則返回字符串中的第一個(gè)整數(shù)數(shù)字</param>
/// <returns>整數(shù)數(shù)字</returns>
private static int GetInt(string origin, bool fullMatch)
{
if (string.IsNullOrEmpty(origin))
{
return 0;
}
origin = origin.Trim();
if (!fullMatch)
{
string pat = @"-?\d+";
Regex reg = new Regex(pat);
origin = reg.Match(origin.Trim()).Value;
}
int res = 0;
int.TryParse(origin, out res);
return res;
}
#endregion
#region P/Invoke 設(shè)置本地時(shí)間
[DllImport("kernel32.dll")]
private static extern bool SetLocalTime(ref SYSTEMTIME time);
[StructLayout(LayoutKind.Sequential)]
private struct SYSTEMTIME
{
public short year;
public short month;
public short dayOfWeek;
public short day;
public short hour;
public short minute;
public short second;
public short milliseconds;
}
/// <summary>
/// 設(shè)置本地計(jì)算機(jī)時(shí)間
/// </summary>
/// <param name="dt">DateTime對(duì)象</param>
public static void SetLocalTime(DateTime dt)
{
SYSTEMTIME st;
st.year = (short)dt.Year;
st.month = (short)dt.Month;
st.dayOfWeek = (short)dt.DayOfWeek;
st.day = (short)dt.Day;
st.hour = (short)dt.Hour;
st.minute = (short)dt.Minute;
st.second = (short)dt.Second;
st.milliseconds = (short)dt.Millisecond;
SetLocalTime(ref st);
}
#endregion
兩步操作就可以搞定時(shí)間的同步，測(cè)試效果還是不錯(cuò)，不過不建議頻繁進(jìn)行時(shí)間的同步處理，間隔一段時(shí)間檢查一次即可。
如果你有更好的方法，希望大家交流提高。
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