/// <summary>
/// 生成区域头部
/// <paramref name="offset">偏移位置</paramref>
/// </summary>
private byte[] GeneratorDataRegionHeader(out int totallenght)
{
Stopwatch sw = new Stopwatch();
sw.Start();
//文件头部结构:Pre DataRegion(8) + Next DataRegion(8) + Datatime(8)+tagcount(4)+ tagid sum(8) +file duration(4)+ block duration(4)+Time tick duration(4)+ { len + [tag id]}+ [data blockpoint(8)]
int blockcount = FileDuration * 60 / BlockDuration;
int len = GetDataRegionHeaderLength() + 4 + mTagIdMemoryCach.Position + mTagCount * (blockcount * 8);
totallenght = len;
using (System.IO.MemoryStream mHeadMemory = new System.IO.MemoryStream())
{
mHeadMemory.Position = 0;
mHeadMemory.Write(BitConverter.GetBytes((long)mPreDataRegion)); //更新Pre DataRegion 指针
mHeadMemory.Write(BitConverter.GetBytes((long)0)); //更新Next DataRegion 指针
mHeadMemory.Write(MemoryHelper.GetBytes(mCurrentTime)); //写入时间
mHeadMemory.Write(BitConverter.GetBytes(mTagCount)); //写入变量个数
mHeadMemory.Write(BitConverter.GetBytes(mTagIdSum)); //写入Id 校验和
mHeadMemory.Write(BitConverter.GetBytes(FileDuration)); //写入文件持续时间
mHeadMemory.Write(BitConverter.GetBytes(BlockDuration)); //写入数据块持续时间
mHeadMemory.Write(BitConverter.GetBytes(HisEnginer.MemoryTimeTick)); //写入时间间隔
//写入变量编号列表
mHeadMemory.Write(BitConverter.GetBytes(mTagIdMemoryCach.Position)); // mHeadMemory.Write(mTagIdMemoryCach.Position);//写入压缩后的数组的长度
mHeadMemory.Write(mTagIdMemoryCach.Buffer, 0, mTagIdMemoryCach.Position); //写入压缩数据
mBlockPointOffset = mHeadMemory.Position;
sw.Stop();
LoggerService.Service.Info("SeriseFileItem" + Id, "GeneratorDataRegionHeader " + sw.ElapsedMilliseconds);
return(mHeadMemory.ToArray());
}
}
/// <summary>
///
/// </summary>
/// <param name="value"></param>
/// <param name="start"></param>
public override DataFileSeriserbase Write(DateTime value, long start)
{
mStream.Position = start;
mStream.Write(MemoryHelper.GetBytes(value), 0, 8);
return(this);
}
