从C ++中的hdf5读取字符串 [英] Reading a string from hdf5 in C++

问题描述

我在Microsoft Visual C ++ 2008中的H5文件中读取数据集。一切对于int类型和double类型的数据都很好，但是当我遇到字符串时遇到问题。在H5文件中，我有18个字符串，每个固定长度为24.我的代码如下：

I am reading in datasets from a H5 file in Microsoft Visual C++ 2008. Everything works fine for data of type int and double but I run into problems when I come across strings. In the H5 file I have 18 strings each of fixed length 24. My code is as follows;

StrType strdatatype(PredType::C_S1, 24);
char *buffer1[18];
DataSet datasetCurveNames = riskFactorsH5.openDataSet("/gstrCurveNames");

datasetCurveNames.read(&buffer1, strdatatype);

执行时，buffer1被错误指针填充。作为一个替代，我已经尝试使用H5T_VARIABLE管理变量长度字符串与修改：

On execution buffer1 is filled with bad pointers. As an alternative I have tried using H5T_VARIABLE to manage variable length strings with the modification:

 StrType strdatatype(PredType::C_S1, H5T_VARIABLE);

这也失败。

干杯，
Lucas

Cheers, Lucas

推荐答案

HDF5 C ++ API非常缺乏文档。这是我从数据集的字符串中读取的方式。我只是在代码完成IDE的帮助下想出这一点：

The HDF5 C++ API is woefully under-documented. This is how I read in strings from a dataset. I only figured this out with the help of a code-completion IDE:

using namespace H5;
std::string field_name("name of the field");
StrType datatype(0, H5T_VARIABLE);
DataSpace dataspace(H5S_SCALAR);
DataSet datset = group.openDataSet(field_name);

std::string field_value;
datset.read(field_value, datatype, dataspace);

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