介绍

官网很多用例测试，但是全英的优点费劲，这里就将示例总结一下，提高用例的可读性，希望能帮助大家快速上手HDF5.

相关函数及作用

用例代码及说明

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

#pragma execution_character_set("utf-8")

#define FILE            "h5ex_t_cmpd.h5"
#define DATASET         "DS1"
#define DIM0            10

using namespace std;

struct sensor_r{
    string  location1;
    string  location2;
    string  location3;
    string  location4;
    string  location5;
    string  location6;
    string  location7;
    int     serial_no;
    string  location;
    double  temperature;
    double  pressure;
};

typedef struct {
    char    *location1;
    char    *location2;
    char    *location3;
    char    *location4;
    char    *location5;
    char    *location6;
    char    *location7;
    int     serial_no;
    char    *location;
    double  temperature;
    double  pressure;
} sensor_t;                                 /* Compound type */

int
main (void)
{
    hid_t       file, filetype, memtype, strtype, space, dset;
                                            /* Handles */
    herr_t      status;
    hsize_t     dims[1] = {DIM0};
    int         ndims,
                i;

    sensor_r rdata[DIM0];
    for (int i = 0; i < DIM0; i++)
    {
        rdata[i].location1 = "test";
        rdata[i].location2 = "test中文";
        rdata[i].location3 = "test";
        rdata[i].location4 = "test";
        rdata[i].location5 = "test";
        rdata[i].location6 = "test";
        rdata[i].location7 = "test";
        rdata[i].serial_no = i;
        rdata[i].location = "test123中文";
        rdata[i].temperature = i;
        rdata[i].pressure = 2.0;
    }

    sensor_t * wdata = new sensor_t[DIM0];
    
    for (int i = 0; i < DIM0; i++)
    {
        wdata[i].location1 = (char*)rdata[i].location1.c_str();
        wdata[i].location2 = (char*)rdata[i].location2.c_str();
        wdata[i].location3 = (char*)rdata[i].location3.c_str();
        wdata[i].location4 = (char*)rdata[i].location4.c_str();
        wdata[i].location5 = (char*)rdata[i].location5.c_str();
        wdata[i].location6 = (char*)rdata[i].location6.c_str();
        wdata[i].location7 = (char*)rdata[i].location7.c_str();
        wdata[i].serial_no = i;
        wdata[i].location = (char*)rdata[i].location.c_str();
        wdata[i].temperature = i;
        wdata[i].pressure = 2.0;
        cout << wdata[i].location2 << endl;
    }
    

    /*
     * Create a new file using the default properties.
     */
    file = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);

    /*
     * Create variable-length string datatype.
     */
    strtype = H5Tcopy (H5T_C_S1);
    status = H5Tset_size (strtype, H5T_VARIABLE);

    /*
     * Create the compound datatype for memory.
     */
    memtype = H5Tcreate (H5T_COMPOUND, sizeof (sensor_t));
    status = H5Tinsert (memtype, "Location1", HOFFSET (sensor_t, location1),strtype);
    status = H5Tinsert (memtype, "Location2", HOFFSET (sensor_t, location2),strtype);
    status = H5Tinsert (memtype, "Location3", HOFFSET (sensor_t, location3),strtype);
    status = H5Tinsert (memtype, "Location4", HOFFSET (sensor_t, location4),strtype);
    status = H5Tinsert (memtype, "Location5", HOFFSET (sensor_t, location5),strtype);
    status = H5Tinsert (memtype, "Location6", HOFFSET (sensor_t, location6),strtype);
    status = H5Tinsert (memtype, "Location7", HOFFSET (sensor_t, location7),strtype);
    status = H5Tinsert (memtype, "Serial number",HOFFSET (sensor_t, serial_no), H5T_NATIVE_INT);
    status = H5Tinsert (memtype, "Location", HOFFSET (sensor_t, location),strtype);
    status = H5Tinsert (memtype, "Temperature (F)", HOFFSET (sensor_t, temperature), H5T_NATIVE_DOUBLE);
    status = H5Tinsert (memtype, "Pressure (inHg)", HOFFSET (sensor_t, pressure), H5T_NATIVE_DOUBLE);

    /*
     * Create dataspace.  Setting maximum size to NULL sets the maximum
     * size to be the current size.
     */
    space = H5Screate_simple (1, dims, NULL);

    /*
     * Create the dataset and write the compound data to it.
     */
    dset = H5Dcreate (file, DATASET, memtype, space, H5P_DEFAULT, H5P_DEFAULT,
                H5P_DEFAULT);
    status = H5Dwrite (dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata);

    /*
     * Close and release resources.
     */
    status = H5Dclose (dset);
    status = H5Sclose (space);
    status = H5Tclose (memtype);
    status = H5Fclose (file);

    return 0;
}

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