C++ H5Fclose函数代码示例

//.........这里部分代码省略.........
    hid_t	space=-1;		/*data space			*/
    hid_t	dset=-1;		/*dataset			*/
    hid_t	grp=-1;			/*group to emit diagnostics	*/
    int		fd;			/*external file descriptors	*/
    size_t	i, j;			/*miscellaneous counters	*/
    hssize_t	n;			/*bytes of I/O			*/
    char	filename[1024];		/*file names			*/
    int		part[25], whole[100];	/*raw data buffers		*/
    hsize_t	cur_size;		/*current data space size	*/
    hid_t	hs_space;		/*hyperslab data space		*/
    hsize_t	hs_start = 30;		/*hyperslab starting offset	*/
    hsize_t	hs_count = 25;		/*hyperslab size		*/
	int temparray[10] = {0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f};

    TESTING("read external dataset");

    /* Write the data to external files directly */
    for (i=0; i<4; i++) {
	for (j=0; j<25; j++) {
	    part[j] = (int)(i*25+j);
	}
	sprintf (filename, "extern_%lua.raw", (unsigned long)i+1);
	fd = HDopen(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
	assert (fd>=0);
/*	n = lseek (fd, (off_t)(i*10), SEEK_SET);
*/
	n = HDwrite(fd,temparray,(size_t)i*10);
	assert (n>=0 && (size_t)n==i*10);
	n = HDwrite(fd, part, sizeof(part));
	assert (n==sizeof(part));
	HDclose(fd);
    }

    /*
     * Create the file and an initial group.  This causes messages about
     * debugging to be emitted before we start playing games with what the
     * output looks like.
     */
    h5_fixname(FILENAME[1], fapl, filename, sizeof filename);
    if((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0) FAIL_STACK_ERROR
    if((grp = H5Gcreate2(file, "emit-diagnostics", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) FAIL_STACK_ERROR
    if(H5Gclose(grp) < 0) FAIL_STACK_ERROR

    /* Create the dataset */
    if((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0) goto error;
    if(H5Pset_external(dcpl, "extern_1a.raw",  (off_t)0, (hsize_t)sizeof part) < 0 ||
            H5Pset_external(dcpl, "extern_2a.raw", (off_t)10, (hsize_t)sizeof part) < 0 ||
            H5Pset_external(dcpl, "extern_3a.raw", (off_t)20, (hsize_t)sizeof part) < 0 ||
            H5Pset_external(dcpl, "extern_4a.raw", (off_t)30, (hsize_t)sizeof part) < 0)
	goto error;
    cur_size = 100;
    if((space = H5Screate_simple(1, &cur_size, NULL)) < 0) goto error;
    if((dset = H5Dcreate2(file, "dset1", H5T_NATIVE_INT, space, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) goto error;

    /*
     * Read the entire dataset and compare with the original
     */
    memset(whole, 0, sizeof(whole));
    if(H5Dread(dset, H5T_NATIVE_INT, space, space, H5P_DEFAULT, whole) < 0) goto error;
    for(i = 0; i < 100; i++)
	if(whole[i] != (signed)i) {
	    H5_FAILED();
	    puts("    Incorrect value(s) read.");
	    goto error;
	} /* end if */

    /*
     * Read the middle of the dataset
     */
    if((hs_space = H5Scopy(space)) < 0) goto error;
    if(H5Sselect_hyperslab(hs_space, H5S_SELECT_SET, &hs_start, NULL,
			    &hs_count, NULL) < 0) goto error;
    HDmemset(whole, 0, sizeof(whole));
    if(H5Dread(dset, H5T_NATIVE_INT, hs_space, hs_space, H5P_DEFAULT,
		 whole) < 0) goto error;
    if(H5Sclose(hs_space) < 0) goto error;
    for(i = hs_start; i<hs_start+hs_count; i++) {
	if(whole[i] != (signed)i) {
	    H5_FAILED();
	    puts("    Incorrect value(s) read.");
	    goto error;
	}
    }

    if (H5Dclose(dset) < 0) goto error;
    if (H5Pclose(dcpl) < 0) goto error;
    if (H5Sclose(space) < 0) goto error;
    if (H5Fclose(file) < 0) goto error;
    PASSED();
    return 0;

 error:
    H5E_BEGIN_TRY {
	H5Dclose(dset);
	H5Pclose(dcpl);
	H5Sclose(space);
	H5Fclose(file);
    } H5E_END_TRY;
    return 1;
}

int
main (void)
{
    hid_t       file, filetype, memtype, space, dset;
                                            /* Handles */
    herr_t      status;
    hsize_t     dims[1] = {DIM0};
    char        *wdata[DIM0] = {"Parting", "is such", "sweet", "sorrow."},
                                            /* Write buffer */
                **rdata;                    /* Read buffer */
    int         ndims,
                i;

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

    /*
     * Create file and memory datatypes.  For this example we will save
     * the strings as FORTRAN strings.
     */
    filetype = H5Tcopy (H5T_FORTRAN_S1);
    status = H5Tset_size (filetype, H5T_VARIABLE);
    memtype = H5Tcopy (H5T_C_S1);
    status = H5Tset_size (memtype, H5T_VARIABLE);

    /*
     * 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 variable-length string data to
     * it.
     */
    dset = H5Dcreate (file, DATASET, filetype, 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 (filetype);
    status = H5Tclose (memtype);
    status = H5Fclose (file);


    /*
     * Now we begin the read section of this example.  Here we assume
     * the dataset has the same name and rank, but can have any size.
     * Therefore we must allocate a new array to read in data using
     * malloc().
     */

    /*
     * Open file and dataset.
     */
    file = H5Fopen (FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
    dset = H5Dopen (file, DATASET, H5P_DEFAULT);

    /*
     * Get the datatype.
     */
    filetype = H5Dget_type (dset);

    /*
     * Get dataspace and allocate memory for read buffer.
     */
    space = H5Dget_space (dset);
    ndims = H5Sget_simple_extent_dims (space, dims, NULL);
    rdata = (char **) malloc (dims[0] * sizeof (char *));

    /*
     * Create the memory datatype.
     */
    memtype = H5Tcopy (H5T_C_S1);
    status = H5Tset_size (memtype, H5T_VARIABLE);

    /*
     * Read the data.
     */
    status = H5Dread (dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata);

    /*
     * Output the data to the screen.
     */
    for (i=0; i<dims[0]; i++)
        printf ("%s[%d]: %s\n", DATASET, i, rdata[i]);

    /*
     * Close and release resources.  Note that H5Dvlen_reclaim works
     * for variable-length strings as well as variable-length arrays.
     * Also note that we must still free the array of pointers stored
     * in rdata, as H5Tvlen_reclaim only frees the data these point to.
     */
    status = H5Dvlen_reclaim (memtype, space, H5P_DEFAULT, rdata);
//.........这里部分代码省略.........

static int test_attr(void)
{
    hid_t   file_id;
    hid_t   dataset_id;
    hid_t   group_id;
    hid_t   space_id;
    hsize_t dims[1] = { 5 };

    /* Create a new file using default properties. */
    file_id = H5Fcreate(FILE_NAME2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);

    /*-------------------------------------------------------------------------
    * Create a dataset named "dset" on the root group
    *-------------------------------------------------------------------------
    */

    /* Create the data space  */
    if((space_id = H5Screate_simple(1, dims, NULL)) < 0) goto out;

    /* Create the dataset */
    if((dataset_id = H5Dcreate2(file_id , "dset", H5T_NATIVE_INT, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) goto out;

    /* Close */
    H5Dclose(dataset_id);

    /*-------------------------------------------------------------------------
    * Create a group named "grp" on the root group
    *-------------------------------------------------------------------------
    */

    /* Create a group. */
    if((group_id = H5Gcreate2(file_id, "grp", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) goto out;

    /* Close */
    H5Gclose(group_id);

    /*-------------------------------------------------------------------------
    *
    * Create attributes in the root group
    * Note that we are calling the H5LTset_attribute functions with the name "."
    *
    *-------------------------------------------------------------------------
    */
    if(make_attributes(file_id, ".") < 0) goto out;

    /*-------------------------------------------------------------------------
    *
    * Create attributes in the dataset "dset"
    *
    *-------------------------------------------------------------------------
    */
    if(make_attributes(file_id, "dset") < 0) goto out;

    /*-------------------------------------------------------------------------
    *
    * Create attributes in the group "grp"
    *
    *-------------------------------------------------------------------------
    */
    if(make_attributes(file_id, "grp") < 0) goto out;

    /*-------------------------------------------------------------------------
    * end
    *-------------------------------------------------------------------------
    */
    /* Close the file. */
    H5Fclose(file_id);

    return 0;

out:
    /* Close the file. */
    H5Fclose(file_id);

    H5_FAILED();
    return -1;
}

GDALDataset *BAGDataset::Open( GDALOpenInfo * poOpenInfo )

{
/* -------------------------------------------------------------------- */
/*      Confirm that this appears to be a BAG file.                     */
/* -------------------------------------------------------------------- */
    if( !Identify( poOpenInfo ) )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Confirm the requested access is supported.                      */
/* -------------------------------------------------------------------- */
    if( poOpenInfo->eAccess == GA_Update )
    {
        CPLError( CE_Failure, CPLE_NotSupported, 
                  "The BAG driver does not support update access." );
        return NULL;
    }
    
/* -------------------------------------------------------------------- */
/*      Open the file as an HDF5 file.                                  */
/* -------------------------------------------------------------------- */
    hid_t hHDF5 = H5Fopen( poOpenInfo->pszFilename, 
                           H5F_ACC_RDONLY, H5P_DEFAULT );

    if( hHDF5 < 0 )  
        return NULL;

/* -------------------------------------------------------------------- */
/*      Confirm it is a BAG dataset by checking for the                 */
/*      BAG_Root/Bag Version attribute.                                 */
/* -------------------------------------------------------------------- */
    hid_t hBagRoot = H5Gopen( hHDF5, "/BAG_root" );
    hid_t hVersion = -1;

    if( hBagRoot >= 0 )
        hVersion = H5Aopen_name( hBagRoot, "Bag Version" );

    if( hVersion < 0 )
    {
        if( hBagRoot >= 0 )
            H5Gclose( hBagRoot );
        H5Fclose( hHDF5 );
        return NULL;
    }
    H5Aclose( hVersion );

/* -------------------------------------------------------------------- */
/*      Create a corresponding dataset.                                 */
/* -------------------------------------------------------------------- */
    BAGDataset *poDS = new BAGDataset();

    poDS->hHDF5 = hHDF5;

/* -------------------------------------------------------------------- */
/*      Extract version as metadata.                                    */
/* -------------------------------------------------------------------- */
    CPLString osVersion;

    if( GH5_FetchAttribute( hBagRoot, "Bag Version", osVersion ) )
        poDS->SetMetadataItem( "BagVersion", osVersion );

    H5Gclose( hBagRoot );

/* -------------------------------------------------------------------- */
/*      Fetch the elevation dataset and attach as a band.               */
/* -------------------------------------------------------------------- */
    int nNextBand = 1;
    hid_t hElevation = H5Dopen( hHDF5, "/BAG_root/elevation" );
    if( hElevation < 0 )
    {
        delete poDS;
        return NULL;
    }

    BAGRasterBand *poElevBand = new BAGRasterBand( poDS, nNextBand );

    if( !poElevBand->Initialize( hElevation, "elevation" ) )
    {
        delete poElevBand;
        delete poDS;
        return NULL;
    }

    poDS->nRasterXSize = poElevBand->nRasterXSize;
    poDS->nRasterYSize = poElevBand->nRasterYSize;

    poDS->SetBand( nNextBand++, poElevBand );

/* -------------------------------------------------------------------- */
/*      Try to do the same for the uncertainty band.                    */
/* -------------------------------------------------------------------- */
    hid_t hUncertainty = H5Dopen( hHDF5, "/BAG_root/uncertainty" );
    BAGRasterBand *poUBand = new BAGRasterBand( poDS, nNextBand );

    if( hUncertainty >= 0 && poUBand->Initialize( hUncertainty, "uncertainty") )
    {
        poDS->SetBand( nNextBand++, poUBand );
    }
    else
//.........这里部分代码省略.........

void close_file(hid_t h5file) {
  if (h5file >= 0) {
    assert(H5Fclose(h5file) >= 0);
  }
}

int
main()
{
   printf("\n*** Checking HDF5 attribute functions for memory leaks.\n");
#ifdef EXTRA_TESTS
   printf("*** Checking vlen of compound file...");
   {
#define NUM_OBJ_2 2
#define ATT_NAME "Poseidon"
      hid_t fapl_id, fcpl_id;
      size_t chunk_cache_size = MY_CHUNK_CACHE_SIZE;
      size_t chunk_cache_nelems = CHUNK_CACHE_NELEMS;
      float chunk_cache_preemption = CHUNK_CACHE_PREEMPTION;
      hid_t fileid, grpid, attid, spaceid;
      hid_t s1_typeid, vlen_typeid;
      hid_t file_typeid1[NUM_OBJ_2], native_typeid1[NUM_OBJ_2];
      hid_t file_typeid2, native_typeid2;
      hsize_t num_obj;
      H5O_info_t obj_info;
      char obj_name[STR_LEN + 1];
      hsize_t dims[1] = {ATT_LEN}; /* netcdf attributes always 1-D. */
      struct s1
      {
	 float x;
	 double y;
      };

      /* vc stands for "Vlen of Compound." */
      hvl_t *vc_out;
      int i, k;

      /* Create some output data: an array of vlen (length ATT_LEN) of
       * struct s1. */
      if (!(vc_out = calloc(sizeof(hvl_t), ATT_LEN))) ERR;
      for (i = 0; i < ATT_LEN; i++)
      {
	 vc_out[i].len = i + 1; 
	 if (!(vc_out[i].p = calloc(sizeof(struct s1), vc_out[i].len))) ERR;
	 for (k = 0; k < vc_out[i].len; k++)
	 {
	    ((struct s1 *)vc_out[i].p)[k].x = 42.42;
	    ((struct s1 *)vc_out[i].p)[k].y = 2.0;
	 }
      }
      
      /* Create the HDF5 file, with cache control, creation order, and
       * all the timmings. */
      if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0) ERR;
      if (H5Pset_fclose_degree(fapl_id, H5F_CLOSE_STRONG)) ERR;
      if (H5Pset_cache(fapl_id, 0, chunk_cache_nelems, chunk_cache_size, 
		       chunk_cache_preemption) < 0) ERR;
      if ((fcpl_id = H5Pcreate(H5P_FILE_CREATE)) < 0) ERR;
      if (H5Pset_link_creation_order(fcpl_id, (H5P_CRT_ORDER_TRACKED | 
					       H5P_CRT_ORDER_INDEXED)) < 0) ERR;
      if (H5Pset_attr_creation_order(fcpl_id, (H5P_CRT_ORDER_TRACKED | 
					       H5P_CRT_ORDER_INDEXED)) < 0) ERR;
      if ((fileid = H5Fcreate(FILE_NAME, H5F_ACC_TRUNC, fcpl_id, fapl_id)) < 0) ERR;
      if (H5Pclose(fapl_id) < 0) ERR;
      if (H5Pclose(fcpl_id) < 0) ERR;
      
      /* Open the root group. */
      if ((grpid = H5Gopen2(fileid, "/", H5P_DEFAULT)) < 0) ERR;
      
      /* Create the compound type for struct s1. */
      if ((s1_typeid = H5Tcreate(H5T_COMPOUND, sizeof(struct s1))) < 0) ERR;
      if (H5Tinsert(s1_typeid, X_NAME, offsetof(struct s1, x), 
		    H5T_NATIVE_FLOAT) < 0) ERR;
      if (H5Tinsert(s1_typeid, Y_NAME, offsetof(struct s1, y), 
		    H5T_NATIVE_DOUBLE) < 0) ERR;
      if (H5Tcommit(grpid, S1_TYPE_NAME, s1_typeid) < 0) ERR;
      
      /* Create a vlen type. Its a vlen of stuct s1. */
      if ((vlen_typeid = H5Tvlen_create(s1_typeid)) < 0) ERR;
      if (H5Tcommit(grpid, VLEN_TYPE_NAME, vlen_typeid) < 0) ERR;
      
      /* Create an attribute of this new type. */
      if ((spaceid = H5Screate_simple(1, dims, NULL)) < 0) ERR;
      if ((attid = H5Acreate(grpid, ATT_NAME, vlen_typeid, spaceid, 
			     H5P_DEFAULT)) < 0) ERR;
      if (H5Awrite(attid, vlen_typeid, vc_out) < 0) ERR;
      
      /* Close the types. */
      if (H5Tclose(s1_typeid) < 0 ||
	  H5Tclose(vlen_typeid) < 0) ERR;
	  
      /* Close the att. */
      if (H5Aclose(attid) < 0) ERR;
      
      /* Close the space. */
      if (H5Sclose(spaceid) < 0) ERR;

      /* Close the group and file. */
      if (H5Gclose(grpid) < 0 ||
	  H5Fclose(fileid) < 0) ERR;

      /* Reopen the file. */
      if ((fileid = H5Fopen(FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT)) < 0) ERR;
      if ((grpid = H5Gopen(fileid, "/")) < 0) ERR;

      /* How many objects in this group? (There should be 2, the
//.........这里部分代码省略.........

//.........这里部分代码省略.........
					print_help();
				break;
        	}
    }
		
    for ( ; optind < argc; optind++) {
        if (access(argv[optind], R_OK)) {
 			printf("Geht\n");
			}
	}

	
	printf("Opening HDF file...\n");
	
    h5file = H5Fopen(hdf_filepath, H5F_ACC_RDONLY, H5P_DEFAULT);
    if (h5file < 0)
    {
        fprintf(stderr, "Could not open HDF5 file \"%s\"\n", argv[1]);
        return EXIT_FAILURE;
    }

    


    /************************************************************************
     * Get mesh parameters.                                                 *
     ************************************************************************/

    /* Read input group */
    input = H5Gopen(h5file, "input");
    if (input < 0)
    {
        fprintf(stderr, "Could not open /input group in \"%s\"\n", argv[1]);
        status = H5Fclose(h5file);
        return EXIT_FAILURE;
    }
	
	
    status = get_attribute_str(input, "datafile", &datafile);
    status = get_attribute_int(input, "nproc_surf", &caps);
    status = get_attribute_int(input, "nodex", &nodex);
    status = get_attribute_int(input, "nodey", &nodey);
    status = get_attribute_int(input, "nodez", &nodez);
	status = get_attribute_float(input,"radius_inner",&radius_inner);
	status = get_attribute_float(input,"radius_outer",&radius_outer);
	
	//Bound input params against hdf
	if(nodex_redu<nodex & nodex_redu>0)
	{
	nodex = nodex_redu;
	}
	if(nodey_redu<nodey & nodey_redu>0)
	{
	nodey = nodey_redu;
	}
	if(nodez_redu<nodez & nodez_redu>0)
	{
	nodez = nodez_redu;
	}
	
	
	printf("Nodex: %d\n",nodex);
	printf("Nodey: %d\n",nodey);
	printf("Nodez: %d\n",nodez);
	printf("Caps: %d\n",caps);
    /* Release input group */

/**
 * This methods calculates the eigenvalues for a range of U values. The interval is [Ubegin, Uend]
 * with a stepsize of step. The resulting data is written to a file in the HDF5 file format.
 * @param Ubegin the startpoint for U
 * @param Uend the endpoint for U. We demand Ubegin < Uend
 * @param step the stepsize to use for U
 * @param filename the name of the file write to written the eigenvalues to
 */
void MomHamiltonian::GenerateData(double Ubegin, double Uend, double step, std::string filename)
{
    double Ucur = Ubegin;

    if( !baseUp.size() || !baseDown.size() )
        BuildBase();

    std::vector<double> eigenvalues(dim);

    hid_t       file_id, group_id, dataset_id, dataspace_id, attribute_id;
    herr_t      status;

    file_id = H5Fcreate(filename.c_str(), H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    HDF5_STATUS_CHECK(file_id);

    group_id = H5Gcreate(file_id, "run", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    HDF5_STATUS_CHECK(group_id);

    dataspace_id = H5Screate(H5S_SCALAR);

    attribute_id = H5Acreate (group_id, "L", H5T_STD_I32LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_INT, &L );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "Nu", H5T_STD_I32LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_INT, &Nu );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "Nd", H5T_STD_I32LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_INT, &Nd );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "J", H5T_IEEE_F64LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_DOUBLE, &J );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "Ubegin", H5T_IEEE_F64LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_DOUBLE, &Ubegin );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "Uend", H5T_IEEE_F64LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_DOUBLE, &Uend );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    attribute_id = H5Acreate (group_id, "Ustep", H5T_IEEE_F64LE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Awrite (attribute_id, H5T_NATIVE_DOUBLE, &step );
    HDF5_STATUS_CHECK(status);
    status = H5Aclose(attribute_id);
    HDF5_STATUS_CHECK(status);

    status = H5Sclose(dataspace_id);
    HDF5_STATUS_CHECK(status);

    status = H5Gclose(group_id);
    HDF5_STATUS_CHECK(status);

    status = H5Fclose(file_id);
    HDF5_STATUS_CHECK(status);

    std::vector<double> diagonalelements(dim);

    std::vector< std::unique_ptr<double []> > offdiag;
    offdiag.resize(L);

    // make sure that we don't rebuild the whole hamiltonian every time.
    // store the hopping and interaction part seperate so we can just
    // add them in every step
    #pragma omp parallel for
    for(int B=0; B<L; B++)
    {
        int cur_dim = mombase[B].size();
        int offset = 0;

        for(int tmp=0; tmp<B; tmp++)
            offset += mombase[tmp].size();

        offdiag[B].reset(new double [cur_dim*cur_dim]);

        for(int i=0; i<cur_dim; i++)
        {
//.........这里部分代码省略.........

// localRowChunk will be allocated inside the function
double loadMatrix(char * infilename, char * datasetname, distMatrixInfo
    *matInfo, double ** localRowChunk, MPI_Comm *comm, MPI_Info *info) {
    double startTime = MPI_Wtime();

    // assuming double inputs, check that the chunks aren't too big to be read
    // by HDF5 in parallel mode
    if (matInfo->bigPartitionSize*matInfo->numcols >= 268435456 &&
        matInfo->mpi_rank == 0) {
        fprintf(stderr, "MPIIO-based HDF5 is limited to reading 2GiB at most in "
            "each call to read; try increasing the number of processors\n");
        exit(-1); }

    *localRowChunk = (double *) malloc( matInfo->localrows * matInfo->numcols *sizeof(double) );
    if (*localRowChunk == NULL) {
        fprintf(stderr, "Could not allocate enough memory for the local chunk "
            "of rows for %s in process %d\n", datasetname, matInfo->mpi_rank);
        exit(-1);
    }

    hid_t plist_id = H5Pcreate(H5P_FILE_ACCESS);
    H5Pset_fapl_mpio(plist_id, *comm, *info);
    hid_t file_id = H5Fopen(infilename, H5F_ACC_RDONLY, plist_id);
    if (file_id < 0) {
        fprintf(stderr, "Error opening %s\n", infilename);
        exit(-1);
    }

    hid_t dataset_id = H5Dopen(file_id, datasetname, H5P_DEFAULT);
    if (dataset_id < 0) {
        fprintf(stderr, "Error opening %s in %s : are you sure this dataset "
            "exists?\n", datasetname, infilename);
        exit(-1);
    }

    hsize_t offset[2], count[2], offset_out[2];
    count[0] = matInfo->localrows;
    count[1] = matInfo->numcols;
    offset[0] = matInfo->mpi_rank < matInfo->numBigPartitions ? 
                (matInfo->mpi_rank * matInfo->bigPartitionSize) : 
                (matInfo->numBigPartitions * matInfo->bigPartitionSize + 
                    (matInfo->mpi_rank - matInfo->numBigPartitions) * 
                    matInfo->littlePartitionSize );
    offset[1] = 0;

    hid_t filespace = H5Dget_space(dataset_id);
    if ( H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL, count, NULL) < 0 ) {
        fprintf(stderr, "Error selecting input file hyperslab in process %d\n",
            matInfo->mpi_rank);
        exit(-1);
    }

    hid_t memspace = H5Screate_simple(2, count, NULL);
    offset_out[0] = 0;
    offset_out[1] = 0;
    if ( H5Sselect_hyperslab(memspace, H5S_SELECT_SET, offset_out, NULL, count, NULL) < 0 ) {
        fprintf(stderr, "Error selecting memory hyperslab in process %d\n",
            matInfo->mpi_rank);
        exit(-1);
    }

    hid_t daccess_id = H5Pcreate(H5P_DATASET_XFER);
    H5Pset_dxpl_mpio(daccess_id, H5FD_MPIO_INDEPENDENT); // collective io seems slow for this

    if (matInfo->mpi_rank == 0) {
        printf("Loading matrix from dataset %s in file %s\n", datasetname,
            infilename);
    }
    if( H5Dread(dataset_id, H5T_NATIVE_DOUBLE, memspace, filespace, daccess_id, *localRowChunk) < 0) {
        fprintf(stderr, "Error reading dataset in process %d\n", matInfo->mpi_rank);
        exit(-1);
    }

    H5Pclose(daccess_id);
    H5Sclose(memspace);
    H5Sclose(filespace);
    H5Dclose(dataset_id);
    H5Fclose(file_id);
    H5Pclose(plist_id);

    return MPI_Wtime() - startTime;
}

/*-------------------------------------------------------------------------
 * Function:	main
 *
 * Purpose:	Test error API.
 *
 * Programmer:	Raymond Lu
 *		July 10, 2003
 *
 *-------------------------------------------------------------------------
 */
int
main(void)
{
    hid_t		file, fapl;
    hid_t               estack_id;
    char		filename[1024];
    const char          *FUNC_main = "main";

    HDfprintf(stderr, "   This program tests the Error API.  There're supposed to be some error messages\n");

    /* Initialize errors */
    if(init_error() < 0)
        TEST_ERROR;

    fapl = h5_fileaccess();

    h5_fixname(FILENAME[0], fapl, filename, sizeof filename);
    if((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
	TEST_ERROR;

    /* Test error stack */
    if(error_stack() < 0) {
        /* Push an error onto error stack */
        if(H5Epush(ERR_STACK, __FILE__, FUNC_main, __LINE__, ERR_CLS, ERR_MAJ_TEST, ERR_MIN_ERRSTACK,
                "Error stack test failed") < 0) TEST_ERROR;

        /* Delete an error from the top of error stack */
        H5Epop(ERR_STACK, 1);

        /* Make sure we can use other class's major or minor errors. */
        H5Epush(ERR_STACK, __FILE__, FUNC_main, __LINE__, ERR_CLS2, ERR_MAJ_TEST, ERR_MIN_ERRSTACK,
                "Error stack test failed");

        /* Print out the errors on stack */
        dump_error(ERR_STACK);

        /* Empty error stack */
        H5Eclear2(ERR_STACK);

        /* Close error stack */
        H5Eclose_stack(ERR_STACK);
    } /* end if */

    /* Test error API */
    if(test_error(file) < 0) {
        H5Epush(H5E_DEFAULT, __FILE__, FUNC_main, __LINE__, ERR_CLS, ERR_MAJ_TEST, ERR_MIN_SUBROUTINE,
                "Error test failed, %s", "it's wrong");
        estack_id = H5Eget_current_stack();
        H5Eprint2(estack_id, stderr);
        H5Eclose_stack(estack_id);
    } /* end if */

    /* Test pushing a very long error description */
    if(test_long_desc() < 0) TEST_ERROR;

    /* Test creating a new error stack */
    if(test_create() < 0) TEST_ERROR;

    /* Test copying a new error stack */
    if(test_copy() < 0) TEST_ERROR;

    if(H5Fclose(file) < 0) TEST_ERROR;

    /* Close error information */
    if(close_error() < 0)
        TEST_ERROR;

    /* Test error message during data reading when filter isn't registered 
     * Use default FAPL to avoid some VFD drivers by the check-vfd test because
     * the test file was pre-generated. */
    h5_fixname(DATAFILE, H5P_DEFAULT, filename, sizeof filename);
    if(test_filter_error(filename) < 0)
        TEST_ERROR;

    h5_clean_files(FILENAME, fapl);

    HDfprintf(stderr, "\nAll error API tests passed.\n");
    return 0;

error:
    HDfprintf(stderr, "\n***** ERROR TEST FAILED (real problem)! *****\n");
    return 1;
}

int
main(void)
{
    hid_t       file1, file2, group, fapl;      /* Handles */
    herr_t      status;

    /*
     * Create file access property list and set it to allow caching of open
     * files visited through external links.
     */
    fapl = H5Pcreate (H5P_FILE_ACCESS);
    status = H5Pset_elink_file_cache_size (fapl, 8);

    /*
     * Create a new file using the file access property list.
     */
    file1 = H5Fcreate (FILE, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);

    /*
     * Create files to serve as targets for external links.
     */
    file2 = H5Fcreate (EXT_FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Fclose (file2);
    file2 = H5Fcreate (EXT_FILE2, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Fclose (file2);
    file2 = H5Fcreate (EXT_FILE3, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    status = H5Fclose (file2);

    /*
     * Create external links to the target files.
     */
    status = H5Lcreate_external (EXT_FILE1, "/", file1, "link_to_1",
            H5P_DEFAULT, H5P_DEFAULT);
    status = H5Lcreate_external (EXT_FILE2, "/", file1, "link_to_2",
            H5P_DEFAULT, H5P_DEFAULT);
    status = H5Lcreate_external (EXT_FILE3, "/", file1, "link_to_3",
            H5P_DEFAULT, H5P_DEFAULT);

    /*
     * Open and close the targets of all three external links (these will be the
     * root groups of the target files).  The target files should be held open
     * by the root file's external file cache after traversal.
     */
    group = H5Gopen (file1, "/link_to_1", H5P_DEFAULT);
    status = H5Gclose(group);
    group = H5Gopen (file1, "/link_to_2", H5P_DEFAULT);
    status = H5Gclose(group);
    group = H5Gopen (file1, "/link_to_3", H5P_DEFAULT);
    status = H5Gclose(group);

    /*
     * Open and close the targets of all three external links again.  The target
     * files should already be held open by the root file's external file cache,
     * so the library will not actually have to issue an "open" system call.
     */
    group = H5Gopen (file1, "/link_to_1", H5P_DEFAULT);
    status = H5Gclose(group);
    group = H5Gopen (file1, "/link_to_2", H5P_DEFAULT);
    status = H5Gclose(group);
    group = H5Gopen (file1, "/link_to_3", H5P_DEFAULT);
    status = H5Gclose(group);

    /*
     * Release the root file's external file cache.  This will close all the
     * external link target files.
     */
    status = H5Frelease_file_cache(file1);

    /*
     * Close and release resources.
     */
    status = H5Pclose (fapl);
    status = H5Fclose (file1);

    return 0;
}

//.........这里部分代码省略.........
#endif /* USE_MPE */

	 /* Select hyperslab for write of one slice. */
	 start[0] = s * SC1 * p + my_rank * SC1;
	 count[0] = SC1;
	 if (H5Sselect_hyperslab(whole_spaceid, H5S_SELECT_SET,
	 start, NULL, count, NULL) < 0) ERR;

	 if (H5Dwrite(dsid, H5T_NATIVE_INT, slice_spaceid, whole_spaceid,
	 xferid, data) < 0) ERR;

#ifdef USE_MPE
	 MPE_Log_event(e_write, 0, "end write file");
#endif /* USE_MPE */
      }
      write_us = (MPI_Wtime() - ftime) * MILLION;
      MPI_Reduce(&write_us, &max_write_us, 1, MPI_INT, MPI_MAX, 0, MPI_COMM_WORLD);
      if (!my_rank)
      {
	 write_rate = (float)(DIM2_LEN * sizeof(int))/(float)max_write_us;
	 printf("\np=%d, write_rate=%g", p, write_rate);
      }

#ifdef USE_MPE
      MPE_Log_event(s_close, 0, "start close file");
#endif /* USE_MPE */

      /* Close. These collective operations will allow every process
       * to catch up. */
      if (H5Dclose(dsid) < 0 ||
      H5Sclose(whole_spaceid) < 0 ||
      H5Sclose(slice_spaceid) < 0 ||
      H5Pclose(fapl_id) < 0 ||
      H5Fclose(fileid) < 0)
	 ERR;

#ifdef USE_MPE
      MPE_Log_event(e_close, 0, "end close file");
#endif /* USE_MPE */

      /* Open the file. */
      if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0) ERR;
      if (H5Pset_fapl_mpio(fapl_id, MPI_COMM_WORLD, MPI_INFO_NULL) < 0) ERR;


      if (H5Pset_libver_bounds(fapl_id, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0) ERR;
      if ((fileid = H5Fopen(FILE_NAME, H5F_ACC_RDONLY, fapl_id)) < 0) ERR;

      /* Create a space to deal with one slice in memory. */
      dims[0] = SC1;
      if ((slice_spaceid = H5Screate_simple(NDIMS, dims, NULL)) < 0) ERR;

      /* Open the dataset. */
      if ((dsid = H5Dopen(fileid, VAR_NAME)) < 0) ERR;
      if ((whole_spaceid1 = H5Dget_space(dsid)) < 0) ERR;

      ftime = MPI_Wtime();

      /* Read the data, a slice at a time. */
      for (s = 0; s < num_steps; s++)
      {
	 /* Select hyperslab for read of one slice. */
	 start[0] = s * SC1 * p + my_rank * SC1;
	 count[0] = SC1;
	 if (H5Sselect_hyperslab(whole_spaceid1, H5S_SELECT_SET,
	 start, NULL, count, NULL) < 0)

/*-------------------------------------------------------------------------
 * Function:	test_4
 *
 * Purpose:	Tests opening an external link twice.  It exposed a bug
 *              in the library.  This function tests the fix.  This test
 *              doesn't work with MULTI driver.
 *
 * Return:	Success:	0
 *
 * 		Failure:	number of errors
 *
 * Programmer:	Raymond Lu
 *              5 November 2007
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static int
test_4 (hid_t fapl)
{
    hid_t fid = -1;
    hid_t gid = -1;
    hid_t xid = -1;
    hid_t xid2 = -1;
    char  filename[1024];		/*file name			*/
    char  pathname[1024];
    char *srcdir = getenv("srcdir"); /*where the src code is located*/

    TESTING("opening external link twice");

    /* Make a copy of the FAPL, in order to switch to the sec2 driver */
    /* (useful when running test with another VFD) */
    if((fapl = H5Pcopy(fapl)) < 0) FAIL_STACK_ERROR;

    /* Switch local copy of the fapl to the sec2 driver */
    if(H5Pset_fapl_sec2(fapl) < 0) FAIL_STACK_ERROR;

    h5_fixname(FILENAME[3], fapl, filename, sizeof filename);

    if((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        goto error;

    if((gid = H5Gopen2(fid, "/", H5P_DEFAULT)) < 0)
        goto error;

    pathname[0] = '\0';
    /* Generate correct name for test file by prepending the source path */
    if(srcdir && ((HDstrlen(srcdir) + HDstrlen(LINKED_FILE) + 1) < sizeof(pathname))) {
        HDstrcpy(pathname, srcdir);
        HDstrcat(pathname, "/");
    }
    HDstrcat(pathname, LINKED_FILE);

    /* Create an external link to an existing file*/
    if(H5Lcreate_external(pathname, "/group", gid, " link", H5P_DEFAULT, H5P_DEFAULT) < 0)
        goto error;

    if(H5Gclose(gid) < 0)
        goto error;

    if(H5Fclose(fid) < 0)
        goto error;

    /* Reopen the file */
    if((fid = H5Fopen(filename, H5F_ACC_RDONLY, fapl)) < 0)
        goto error;

    /* Open the external link which is "/ link" as created previously via H5Lcreate_external() */
    if((xid = H5Gopen2(fid, "/ link", H5P_DEFAULT)) < 0)
        goto error;

    /* Open the external link twice */
    if((xid2 = H5Gopen2(xid, ".", H5P_DEFAULT)) < 0)
        goto error;

    if(H5Gclose(xid2) < 0)
        goto error;

    if(H5Gclose(xid) < 0)
        goto error;

    if(H5Fclose(fid) < 0)
        goto error;

    if(H5Pclose(fapl) < 0)
        TEST_ERROR

    PASSED();

    return 0;

 error:
    H5E_BEGIN_TRY {
        H5Gclose(gid);
        H5Gclose(xid);
        H5Gclose(xid2);
        H5Fclose(fid);
    } H5E_END_TRY;
    return 1;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
static int
test_3 (hid_t fapl)
{
    hid_t	file=-1;		/*file to which to write	*/
    hid_t	dcpl=-1;		/*dataset creation properties	*/
    hid_t	mem_space=-1;		/*memory data space		*/
    hid_t	file_space=-1;		/*file data space		*/
    hid_t	dset=-1;		/*dataset			*/
    unsigned	i;			/*miscellaneous counters	*/
    int		fd;			/*external file descriptor	*/
    int	    part[25],whole[100];	/*raw data buffers		*/
    hsize_t	cur_size=100;		/*current data space size	*/
    hsize_t	max_size=200;		/*maximum data space size	*/
    hsize_t	hs_start=100;		/*hyperslab starting offset	*/
    hsize_t	hs_count=100;		/*hyperslab size		*/
    char	filename[1024];		/*file name			*/
	int temparray[10] = {0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f,0x0f0f0f0f};

    TESTING("write external dataset");

    /* Create another file */
    h5_fixname(FILENAME[2], fapl, filename, sizeof filename);
    if ((file=H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0) {
	goto error;
    }

    /* Create the external file list */
    if((dcpl=H5Pcreate(H5P_DATASET_CREATE)) < 0) goto error;
    if (H5Pset_external(dcpl, "extern_1b.raw", (off_t)0, (hsize_t)sizeof part) < 0 ||
	H5Pset_external(dcpl, "extern_2b.raw", (off_t)10, (hsize_t)sizeof part) < 0 ||
	H5Pset_external(dcpl, "extern_3b.raw", (off_t)20, (hsize_t)sizeof part) < 0 ||
	H5Pset_external(dcpl, "extern_4b.raw", (off_t)30, H5F_UNLIMITED) < 0)
	goto error;

    /* Make sure the output files are fresh*/
    for (i=1; i<=4; i++) {
	sprintf(filename, "extern_%db.raw", i);
	if ((fd= HDopen(filename, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0) {
	    H5_FAILED();
	    printf("    cannot open %s: %s\n", filename, strerror(errno));
	    goto error;
	}

	HDwrite(fd, temparray, (i-1)*10);
	HDclose(fd);
    }

    /* Create the dataset */
    if((mem_space = H5Screate_simple(1, &cur_size, &max_size)) < 0) goto error;
    if((file_space = H5Scopy(mem_space)) < 0) goto error;
    if((dset = H5Dcreate2(file, "dset1", H5T_NATIVE_INT, file_space, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
	goto error;

    /* Write the entire dataset and compare with the original */
    for(i = 0; i < cur_size; i++)
        whole[i] = i;
    if(H5Dwrite(dset, H5T_NATIVE_INT, mem_space, file_space, H5P_DEFAULT, whole) < 0) goto error;
    for(i = 0; i < 4; i++) {
	char name1[64], name2[64];

	sprintf(name1, "extern_%da.raw", i + 1);
	sprintf(name2, "extern_%db.raw", i + 1);
	if(!same_contents(name1, name2)) {
	    H5_FAILED();
	    puts ("   Output differs from expected value.");
	    goto error;
	} /* end if */
    } /* end for */

    /* Extend the dataset by another 100 elements */
    if(H5Dset_extent(dset, &max_size) < 0) goto error;
    if(H5Sclose(file_space) < 0) goto error;
    if((file_space = H5Dget_space(dset)) < 0) goto error;

    /* Write second half of dataset */
    for(i = 0; i < hs_count; i++)
        whole[i] = 100 + i;
    if(H5Sselect_hyperslab(file_space, H5S_SELECT_SET, &hs_start, NULL, &hs_count, NULL) < 0) goto error;
    if(H5Dwrite(dset, H5T_NATIVE_INT, mem_space, file_space, H5P_DEFAULT, whole) < 0) goto error;


    if(H5Dclose(dset) < 0) goto error;
    if(H5Pclose(dcpl) < 0) goto error;
    if(H5Sclose(mem_space) < 0) goto error;
    if(H5Sclose(file_space) < 0) goto error;
    if(H5Fclose(file) < 0) goto error;

    PASSED();
    return 0;

 error:
    H5E_BEGIN_TRY {
	H5Dclose(dset);
	H5Pclose(dcpl);
	H5Sclose(mem_space);
	H5Sclose(file_space);
	H5Fclose(file);
    } H5E_END_TRY;
    return 1;
}

/****************************************************************
**
**  test_grp_memb_funcs(): Test group member information
**                         functionality
**
****************************************************************/
static void test_grp_memb_funcs(hid_t fapl)
{
    hid_t file;             /* File ID */
    hid_t dataset;          /* Dataset ID */
    hid_t datatype;         /* Common datatype ID */
    hid_t filespace;        /* Common dataspace ID */
    hid_t root_group,grp;   /* Root group ID */
    int i;                  /* counting variable */
    char name[NAMELEN];     /* temporary name buffer */
    char *dnames[NDATASETS+2];/* Names of the datasets created */
    char *obj_names[NDATASETS+2];/* Names of the objects in group */
    char dataset_name[NAMELEN];  /* dataset name */
    ssize_t name_len;       /* Length of object's name */
    H5G_info_t ginfo;       /* Buffer for querying object's info */
    herr_t ret = SUCCEED;	/* Generic return value */

    /* Output message about test being performed */
    MESSAGE(5, ("Testing Group Member Information Functionality\n"));

    /* Create the test file with the datasets */
    file = H5Fcreate(DATAFILE, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
    CHECK(file, FAIL, "H5Fcreate");

    datatype = H5Tcopy(H5T_NATIVE_INT);
    CHECK(datatype, FAIL, "H5Tcopy");

    filespace = H5Screate(H5S_SCALAR);
    CHECK(filespace, FAIL, "H5Screate");

    for(i = 0; i < NDATASETS; i++) {
        sprintf(name, "Dataset %d", i);
        dataset = H5Dcreate2(file, name, datatype, filespace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
        CHECK(dataset, FAIL, "H5Dcreate2");

        /* Keep a copy of the dataset names around for later */
        dnames[i] = HDstrdup(name);
        CHECK(dnames[i], NULL, "strdup");

        ret = H5Dclose(dataset);
        CHECK(ret, FAIL, "H5Dclose");
    } /* end for */

    /* Create a group and named datatype under root group for testing */
    grp = H5Gcreate2(file, "grp", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    CHECK(ret, FAIL, "H5Gcreate2");

    dnames[NDATASETS] = HDstrdup("grp");
    CHECK(dnames[NDATASETS], NULL, "strdup");

    ret = H5Tcommit2(file, "dtype", datatype, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
    CHECK(ret, FAIL, "H5Tcommit2");

    dnames[NDATASETS + 1] = HDstrdup("dtype");
    CHECK(dnames[NDATASETS], NULL, "strdup");

    /* Close everything up */
    ret = H5Tclose(datatype);
    CHECK(ret, FAIL, "H5Tclose");

    ret = H5Gclose(grp);
    CHECK(ret, FAIL, "H5Gclose");

    ret = H5Sclose(filespace);
    CHECK(ret, FAIL, "H5Sclose");

    ret = H5Fclose(file);
    CHECK(ret, FAIL, "H5Fclose");

    /* Sort the dataset names */
    HDqsort(dnames, (size_t)(NDATASETS + 2), sizeof(char *), iter_strcmp);

    /* Iterate through the datasets in the root group in various ways */
    file = H5Fopen(DATAFILE, H5F_ACC_RDONLY, fapl);
    CHECK(file, FAIL, "H5Fopen");

    /* These two functions, H5Oget_info_by_idx and H5Lget_name_by_idx, actually
     * iterate through B-tree for group members in internal library design.
     */
    root_group = H5Gopen2(file, "/", H5P_DEFAULT);
    CHECK(root_group, FAIL, "H5Gopen2");

    ret = H5Gget_info(root_group, &ginfo);
    CHECK(ret, FAIL, "H5Gget_info");
    VERIFY(ginfo.nlinks, (NDATASETS + 2), "H5Gget_info");

    for(i = 0; i < (int)ginfo.nlinks; i++) {
        H5O_info_t oinfo;               /* Object info */

        /* Test with NULL for name, to query length */
        name_len = H5Lget_name_by_idx(root_group, ".", H5_INDEX_NAME, H5_ITER_INC, (hsize_t)i, NULL, (size_t)NAMELEN, H5P_DEFAULT);
        CHECK(name_len, FAIL, "H5Lget_name_by_idx");

        ret = (herr_t)H5Lget_name_by_idx(root_group, ".", H5_INDEX_NAME, H5_ITER_INC, (hsize_t)i, dataset_name, (size_t)(name_len + 1), H5P_DEFAULT);
        CHECK(ret, FAIL, "H5Lget_name_by_idx");
//.........这里部分代码省略.........