Question

I need to read a HDF5 dataset that contains a 3 x 3 array, datatype is double.

My Visual Studio 2017 Pro crashes when returning from my code below.

Stepping with debugger, this code reads the 2-dim array from the HDF5; I can read it in the debugger; but function read_double_array crashes when it returns to caller.

2ND CODE ATTEMPT FROM EXAMPLE AT STACKO ….

    public static double[,]  read_double_array( H5FileId fileId, string dataset_name, int dim1, int dim2 )
{
    double [,] return_data = new double[ dim1, dim2 ];
    try
    {
        H5Array<double> h5_array = new H5Array<double>( return_data );
        H5DataSetId double_array_dataset  = H5D.open( fileId, dataset_name );
        H5D.read<double>(   double_array_dataset, 
                            new H5DataTypeId(H5T.H5Type.NATIVE_DOUBLE), 
                            h5_array );
        H5D.close(double_array_dataset);

    }
    catch( HDFException e )
    {
        Console.WriteLine( e.Message );
        int aa=0;
    }
    return return_data;
}

MY CODE 1ST ATTEMPT, WHICH CRASHED ……………………

public static double[,]  read_double_array( H5FileId fileId, string dataset_name, int dim1, int dim2 )
{
        double [,] return_data = new double[ dim1, dim2 ];
    try
    {
        H5DataSetId dataSetId  = H5D.open( fileId, dataset_name );
        H5D.read(   dataSetId, 
                    new H5DataTypeId( H5T.H5Type.NATIVE_DOUBLE ),
                    new H5Array<double>( return_data ) );
    }
    catch( HDFException e )
    {
        Console.WriteLine( e.Message );
        int aa=0;
    }
    return return_data;  <<<<<<<<<<<<<<<<<<   H A N G S   H E R E
}

Answer 1

使自己免于严重的痛苦（由于HDF5低级实施细节），并查看HDFql。

这里提供了一种在C＃中使用HDFql的解决方案，以读取名为var response = client.PostAsync(_baseEnkiWeb.ToString(), content).Result; var soapResponse = await response.Content.ReadAsStringAsync();的多维（大小为3x3）多维数据集，其数据类型是存储在名为dset的HDF5文件中的两倍（假设文件和数据集已经存在）：

test.h5

Answer 2

我知道了。这是我的代码...

    // Reads a 2-dim array of double.
// INPUT:  fileId of open HDF5 file
public static bool  read_double_array( H5FileId fileId, string dataset_name, int dim1, int dim2, ref double [,] output_double_array )
{

    try
    {
        output_double_array = new double[ dim1, dim2 ];
        H5Array<double> h5_array = new H5Array<double>( output_double_array );
        H5DataSetId dataset = H5D.open( fileId, dataset_name);
        H5D.read<double>(   dataset, 
                            new H5DataTypeId(H5T.H5Type.NATIVE_DOUBLE), 
                            h5_array);
    }
    catch( HDFException e )
    {
        Console.WriteLine( e.Message );
        return false;
    }
    return true;
}

how to read an HDF5 multi-dimensional array dataset using HDF5DotNet from C# .net?

2 个答案: