/// <summary>
/// 二分搜尋法(取逼近值)
/// </summary>
/// <param name="stream">檔案串流類別</param>
/// <param name="count">資料最大 Block 區塊個數(以 blockSize 為一個單位區塊)</param>
/// <param name="blockSize">Block 區塊大小</param>
/// <param name="time">要搜尋的時間</param>
/// <returns>返回值:true=逼近, false=已經有目標</returns>
internal static bool BinaryNearSearch(FileStream stream, long count, int blockSize, DateTime time)
{
if (count == 0)
{
return(false);
}
byte[] bDate = new byte[4];
long lLeft = 0, lMiddle = 0, lRight = count;
ZBuffer cBuffer = new ZBuffer(16);
while (lLeft <= lRight)
{
lMiddle = (lLeft + lRight) / 2;
cBuffer.Position = 0;
stream.Position = lMiddle * blockSize;
stream.Read(cBuffer.Data, 0, 8);
DateTime cTime = cBuffer.GetDateTime();
int iCompare = cTime.CompareTo(time);
if (iCompare == 0)
{
stream.Seek(-8, SeekOrigin.Current); //因為已經讀取的時間日期, 所以 Position 會被移動 8bytes 要在移動回去至日期處, 才是資料 Block 的起點
return(false);
}
else if (iCompare < 0)
{
lLeft = lMiddle + 1;
}
else
{
lRight = lMiddle - 1;
}
}
if (lLeft > count)
{
--lLeft;
}
stream.Position = lLeft * blockSize;
return(true);
}
internal static void Save(string symbolId, bool isMinute, string file, DateTime targetDate)
{
try {
string sFile = string.Format("{0}\\{1}\\{2}", Settings.GlobalSettings.Settings.DataPath, (isMinute) ? "mins" : "days", symbolId);
if (File.Exists(sFile))
{
DateTime cEndDate = targetDate.AddSeconds(86400);
using (FileStream cStream = new FileStream(sFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
ZBuffer cBuffer = new ZBuffer(64);
while (cStream.Read(cBuffer.Data, 0, FileAdapter.MAX_BLOCK_SIZE) > 0)
{
cBuffer.Position = 0;
cBuffer.Length = FileAdapter.MAX_BLOCK_SIZE;
DateTime cTime = cBuffer.GetDateTime();
if (cTime >= targetDate && cTime <= cEndDate)
{
double dOpen = cBuffer.GetDouble();
double dHigh = cBuffer.GetDouble();
double dLow = cBuffer.GetDouble();
double dClose = cBuffer.GetDouble();
double dVolume = cBuffer.GetDouble();
File.AppendAllText(file, string.Format("{0},{1},{2},{3},{4},{5}\r\n", cTime.ToString("yyyy-MM-dd HH:mm:ss"), dOpen, dHigh, dLow, dClose, dVolume), Encoding.UTF8);
System.Console.WriteLine("{0} {1,8:0.00} {2,8:0.00} {3,8:0.00} {4,8:0.00} {5,7}", cTime.ToString("yyyyMMdd HHmmss"), dOpen, dHigh, dLow, dClose, dVolume);
if (cTime >= cEndDate)
{
break;
}
}
}
}
}
} catch (Exception __errExcep) {
if (logger.IsErrorEnabled)
{
logger.ErrorFormat("{0}/r/n{1}", __errExcep.Message, __errExcep.StackTrace);
}
}
}
internal static void SearchNextDate(FileStream stream, int blockSize, DateTime time)
{
byte[] bDate = new byte[4];
ZBuffer cBuffer = new ZBuffer(16);
int iSize = 0;
long lCurrent = stream.Position / blockSize;
while ((iSize = stream.Read(cBuffer.Data, 0, 8)) > 0)
{
cBuffer.Position = 0;
cBuffer.Length = iSize;
DateTime cTime = cBuffer.GetDateTime();
if ((cTime - time).TotalSeconds >= 86400)
{
stream.Seek(-8, SeekOrigin.Current); //因為已經讀取的時間日期, 所以 Position 會被移動 8bytes 要在移動回去至日期處, 才是資料 Block 的起點
break;
}
++lCurrent;
stream.Position = lCurrent * blockSize;
}
}
