c++ - 如何在 C++ 中将 STL::string 写入 HDF5 文件

Question

我在 Windows 平台上使用 HDF5 CPP 库。基本上我想将复合数据类型写入包含 std::string 的 H5 文件。

这段代码没有给出任何错误，但是在写入 H5 文件时它写入了垃圾值...

伙计们，任何提示都是有帮助的......

这是我的代码:-

#include <H5Cpp.h >
#include <vector>
#include <string>
#include <iostream>

using namespace std;
using namespace H5;


/**Compound datatype with STL Datatype*/
struct PostProcessingData
{
  std::string datatype;
};
void main()
{
    H5File file("ResultData.h5",H5F_ACC_TRUNC);
    Group grp(file.createGroup("PostProcessing"));

    PostProcessingData data;
    data.datatype = "stress:xx";

    // create spatial structure of data
    hsize_t len = 1;
    hsize_t dim[1] = {len};
    int rank = 1;
    DataSpace space(rank,dim); 

    // write required size char array
    hid_t strtype = H5Tcopy (H5T_C_S1);
    H5Tset_size (strtype, H5T_VARIABLE);

    //defining the datatype to pass HDF55
    H5::CompType mtype(sizeof(PostProcessingData));
    mtype.insertMember("Filename", HOFFSET(PostProcessingData, datatype), strtype);


    DataSet dataset =  grp.createDataSet("subc_id2",mtype,space);
    dataset.write(&data,mtype);
    space.close();
    mtype.close();
    dataset.close();
    grp.close();
    file.close();
    exit(0);
 }

Answer 1

我得到了以下解决方法来将字符串存储在 HDF5 中:-我必须将 std::字符串转换为 char* 指针。HDF5 非常适合原始数据类型。

#include "H5Cpp.h"
#include <vector>
#include <string>
#include <iostream>


using namespace std;
using namespace H5;


/**Compound datatype with STL Datatype*/
struct PostProcessingData
{
    char* datatype;
};

void main()
{
    H5File file("ResultData.h5",H5F_ACC_TRUNC);
    Group grp(file.createGroup("PostProcessing"));

    PostProcessingData data;
    std::string dt = "stress:xx";
    data.datatype = new char[dt.length()];
    data.datatype = const_cast<char*> (dt.data());

    // create spatial structure of data
    hsize_t len = 1;
    hsize_t dim[1] = {len};
    int rank = 1;
    DataSpace space(rank,dim); 

    // write required size char array
    hid_t strtype = H5Tcopy (H5T_C_S1);
    H5Tset_size (strtype, H5T_VARIABLE);

    //defining the datatype to pass HDF55
    H5::CompType mtype(sizeof(PostProcessingData));
    mtype.insertMember("Filename", HOFFSET(PostProcessingData, datatype), strtype);


    DataSet dataset =  grp.createDataSet("subc_id2",mtype,space);
    //While writing data to file it gives following error
    dataset.write(&data,mtype);
    space.close();
    mtype.close();
    dataset.close();
    grp.close();
    file.close();
    exit(0);

}

这是文件快照:-