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c# - HDF5 示例代码

转载 作者:IT王子 更新时间:2023-10-29 04:38:56 28 4
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使用 HDF5DotNet ,任何人都可以指出示例代码,它将打开一个 hdf5 文件,提取数据集的内容,并将内容打印到标准输出吗?

到目前为止,我有以下内容:

        H5.Open();
var h5 = H5F.open("example.h5", H5F.OpenMode.ACC_RDONLY);
var dataset = H5D.open(h5, "/Timings/aaPCBTimes");
var space = H5D.getSpace(dataset);
var size = H5S.getSimpleExtentDims(space);

然后它变得有点困惑。

我实际上想对数据集的内容做一些处理,但我想一旦我转储到标准输出,我就可以从那里解决它。

更新:我已经解决了这个问题足以解决我自己的问题。我没有意识到数据集是一个多数组——我认为它更像是一个数据库表。万一有人感兴趣,

double[,] dataArray = new double[size[0], 6];
var wrapArray = new H5Array<double>(dataArray);
var dataType = H5D.getType(d);
H5D.read(dataset, dataType, wrapArray);
Console.WriteLine(dataArray[0, 0]);

最佳答案

试试这个:

using System;
using HDF5DotNet;

namespace CSharpExample1
{
class Program
{
// Function used with
static int myFunction(H5GroupId id, string objectName, Object param)
{
Console.WriteLine("The object name is {0}", objectName);
Console.WriteLine("The object parameter is {0}", param);
return 0;
}

static void Main(string[] args)
{
try
{
// We will write and read an int array of this length.
const int DATA_ARRAY_LENGTH = 12;

// Rank is the number of dimensions of the data array.
const int RANK = 1;

// Create an HDF5 file.
// The enumeration type H5F.CreateMode provides only the legal
// creation modes. Missing H5Fcreate parameters are provided
// with default values.
H5FileId fileId = H5F.create("myCSharp.h5",
H5F.CreateMode.ACC_TRUNC);

// Create a HDF5 group.
H5GroupId groupId = H5G.create(fileId, "/cSharpGroup", 0);
H5GroupId subGroup = H5G.create(groupId, "mySubGroup", 0);

// Demonstrate getObjectInfo
ObjectInfo info = H5G.getObjectInfo(fileId, "/cSharpGroup", true);
Console.WriteLine("cSharpGroup header size is {0}", info.headerSize);
Console.WriteLine("cSharpGroup nlinks is {0}", info.nHardLinks);
Console.WriteLine("cSharpGroup fileno is {0} {1}",
info.fileNumber[0], info.fileNumber[1]);
Console.WriteLine("cSharpGroup objno is {0} {1}",
info.objectNumber[0], info.objectNumber[1]);
Console.WriteLine("cSharpGroup type is {0}", info.objectType);


H5G.close(subGroup);

// Prepare to create a data space for writing a 1-dimensional
// signed integer array.
ulong[] dims = new ulong[RANK];
dims[0] = DATA_ARRAY_LENGTH;

// Put descending ramp data in an array so that we can
// write it to the file.
int[] dset_data = new int[DATA_ARRAY_LENGTH];
for (int i = 0; i < DATA_ARRAY_LENGTH; i++)
dset_data[i] = DATA_ARRAY_LENGTH - i;

// Create a data space to accommodate our 1-dimensional array.
// The resulting H5DataSpaceId will be used to create the
// data set.
H5DataSpaceId spaceId = H5S.create_simple(RANK, dims);

// Create a copy of a standard data type. We will use the
// resulting H5DataTypeId to create the data set. We could
// have used the HST.H5Type data directly in the call to
// H5D.create, but this demonstrates the use of H5T.copy
// and the use of a H5DataTypeId in H5D.create.
H5DataTypeId typeId = H5T.copy(H5T.H5Type.NATIVE_INT);

// Find the size of the type
uint typeSize = H5T.getSize(typeId);
Console.WriteLine("typeSize is {0}", typeSize);

// Set the order to big endian
H5T.setOrder(typeId, H5T.Order.BE);

// Set the order to little endian
H5T.setOrder(typeId, H5T.Order.LE);

// Create the data set.
H5DataSetId dataSetId = H5D.create(fileId, "/csharpExample",
typeId, spaceId);

// Write the integer data to the data set.

H5D.write(dataSetId, new H5DataTypeId(H5T.H5Type.NATIVE_INT),
new H5Array<int>(dset_data));

// If we were writing a single value it might look like this.
// int singleValue = 100;
// H5D.writeScalar(dataSetId, new H5DataTypeId(H5T.H5Type.NATIVE_INT),
// ref singleValue);

// Create an integer array to receive the read data.
int[] readDataBack = new int[DATA_ARRAY_LENGTH];

// Read the integer data back from the data set
H5D.read(dataSetId, new H5DataTypeId(H5T.H5Type.NATIVE_INT),
new H5Array<int>(readDataBack));

// Echo the data
for(int i=0;i<DATA_ARRAY_LENGTH;i++)
{
Console.WriteLine(readDataBack[i]);
}

// Close all the open resources.
H5D.close(dataSetId);

// Reopen and close the data sets to show that we can.
dataSetId = H5D.open(fileId, "/csharpExample");
H5D.close(dataSetId);
dataSetId = H5D.open(groupId, "/csharpExample");
H5D.close(dataSetId);

H5S.close(spaceId);
H5T.close(typeId);
H5G.close(groupId);

//int x = 10;
//H5T.enumInsert<int>(typeId, "myString", ref x);
//H5G.close(groupId);
H5GIterateDelegate myDelegate;
myDelegate = myFunction;
int x = 9;
int index = H5G.iterate(fileId, "/cSharpGroup",
myDelegate, x, 0);

// Reopen the group id to show that we can.
groupId = H5G.open(fileId, "/cSharpGroup");
H5G.close(groupId);

H5F.close(fileId);

// Reopen and reclose the file.
H5FileId openId = H5F.open("myCSharp.h5",
H5F.OpenMode.ACC_RDONLY);
H5F.close(openId);
}
// This catches all the HDF exception classes. Because each call
// generates unique exception, different exception can be handled
// separately. For example, to catch open errors we could have used
// catch (H5FopenException openException).
catch (HDFException e)
{
Console.WriteLine(e.Message);
}

Console.WriteLine("Processing complete!");
Console.ReadLine();
}
}
}

关于c# - HDF5 示例代码,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7939723/

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