/// <summary>
/// 创建 HDF5 文件，并设置可以在采集开始的时候设置的 Attribute
/// <param name="dataFilePath">HDF5 文件完整路径</param>
/// <param name="sampleRate">采样率</param>
/// <param name="channelCount">通道总数</param>
/// <param name="startTime">采集开始时间</param>
/// /// </summary>
public DataFileConfig(string dataFilePath, double sampleRate, int channelCount, double startTime)
{
//这个地方，之前的 BinData 不会有问题，因为只是创建了流，流写入文件是最后做的
//而这里一开始就创建了文件，所以如果没有正常写完并调用 SetAndClose 方法，就会有文件打开而没有关闭的风险
try
{
//创建文件
myHDF5File = new HDF5File(dataFilePath);
myHDF5Group = myHDF5File.CreateGroup("Attribute");
//设置 Attribute
myHDF5Group.SetAttribute("StartTime", HDF5AttributeTypes.DOUBLE, startTime);
myHDF5Group.SetAttribute("SampleRate", HDF5AttributeTypes.DOUBLE, sampleRate);
myHDF5Group.SetAttribute("ChannelCount", HDF5AttributeTypes.DOUBLE, channelCount);
myHDF5Group.SetAttribute("CreateTime", HDF5AttributeTypes.DOUBLE, Convert.ToDouble(DateTime.Now.ToLocalTime().ToString("yyyyMMddHHmmss")));
//设置相应个数的 Dataset
myHDF5Datasets = new HDF5Dataset[channelCount];
for (int i = 0; i < channelCount; i++)
{
myHDF5Datasets[i] = new HDF5Dataset();
myHDF5Datasets[i] = myHDF5File.CreateChunkDataset("channel" + i.ToString(), HDF5DataTypes.DOUBLE, new ulong[] { 1000 });
}
}
catch (Exception e)
{
throw new Exception("Create HDF5 file Failed! Error message: " + e);
}
}
/// <summary>
/// 从文件中读出指定通道的数据片段，支持复杂读取
/// </summary>
/// <param name="channelNo">指定的通道，从 0 开始</param>
/// <param name="start">开始点</param>
/// <param name="stride">每次向后多少点</param>
/// <param name="count">读多少次</param>
/// <param name="block">每次读多少个连续点</param>
/// <returns></returns>
public double[] LoadDataFromFileComplex(int channelNo, ulong start, ulong stride, ulong count, ulong block = 1)
{
if (!IsParamsRight(channelNo, start, stride, count, block))
{
return(null);
}
try
{
myH5File.Open(dataFilePath);
myH5Dataset = myH5File.GetDataset("channel" + channelNo.ToString());
double[] data = (double[])myH5Dataset.ComplexRead1DimChunkDataset(start, stride, count, block);
myH5Dataset.Close();
myH5File.Close();
return(data);
}
catch
{
throw new Exception("Something wrong with Data Read, may be you can adjust your params and try again.");
}
}