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Attribute Examples: 

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H5Acreate2 example: Show how to create an attribute for a dataset and a group

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{

    hid_t file;

    hid_t group;

    hid_t dataset;

    hid_t attr;

    hid_t dataspace;

    int32 attr_data;

    int rank;

    size_t dimsf[2];

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    /* Open the file */

    file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT);

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    /* Describe the size of the array and create the data space */

    rank=2;

    dimsf[0] = H5S_UNLIMITED;

    dimsf[1] = H5S_UNLIMITED;

    dataspace = H5Screate_simple(rank, dimsf, NULL); 

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    /* Create a dataset */

    dataset = H5Dcreate2(file, "Dataset1", H5T_UINT8, dataspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);

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    <Write data to first dataset>

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    /* Create an attribute for the dataset */

    attr = H5Acreate2(dataset, "Attr1", H5T_INT32, H5S_SCALAR, H5P_DEFAULT, H5P_DEFAULT);

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    /* Write attribute information */

    H5Awrite(attr, H5T_INT32, &attr_data);

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    /* Close attribute */

    H5Aclose(attr);

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    /* Close dataset */

    H5Dclose(dataset);

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    /* Create a group */

    group = H5Gcreate2(file, "/Group One", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);

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    /* Create an attribute for the dataset */

    attr = H5Acreate2(group, "Attr1", H5T_INT32, H5S_SCALAR, H5P_DEFAULT, H5P_DEFAULT);

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    /* Write attribute information */

    H5Awrite(attr, H5T_INT32, &attr_data);

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    /* Close attribute */

    H5Aclose(attr);