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102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
3 weeks ago
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://www.hdfgroup.org/licenses. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "hdf5_hl.h"
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#include <stdlib.h>
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/*-------------------------------------------------------------------------
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* Packet Table Fixed-Length Example
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*
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* Example program that creates a packet table and performs
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* writes and reads.
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*
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*-------------------------------------------------------------------------
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*/
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int
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main(void)
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{
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hid_t fid; /* File identifier */
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hid_t ptable; /* Packet table identifier */
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herr_t err; /* Function return status */
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hsize_t count; /* Number of records in the table */
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int x; /* Loop variable */
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/* Buffers to hold data */
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int writeBuffer[5];
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int readBuffer[5];
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/* Initialize buffers */
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for (x = 0; x < 5; x++) {
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writeBuffer[x] = x;
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readBuffer[x] = -1;
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}
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/* Create a file using default properties */
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fid = H5Fcreate("packet_table_FLexample.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/* Create a fixed-length packet table within the file */
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/* This table's "packets" will be simple integers and it will use compression
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* level 5. */
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ptable = H5PTcreate_fl(fid, "Packet Test Dataset", H5T_NATIVE_INT, (hsize_t)100, 5);
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if (ptable == H5I_INVALID_HID)
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goto out;
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/* Write one packet to the packet table */
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err = H5PTappend(ptable, (hsize_t)1, &(writeBuffer[0]));
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if (err < 0)
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goto out;
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/* Write several packets to the packet table */
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err = H5PTappend(ptable, (hsize_t)4, &(writeBuffer[1]));
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if (err < 0)
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goto out;
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/* Get the number of packets in the packet table. This should be five. */
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err = H5PTget_num_packets(ptable, &count);
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if (err < 0)
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goto out;
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printf("Number of packets in packet table after five appends: %d\n", (int)count);
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/* Initialize packet table's "current record" */
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err = H5PTcreate_index(ptable);
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if (err < 0)
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goto out;
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/* Iterate through packets, read each one back */
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for (x = 0; x < 5; x++) {
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err = H5PTget_next(ptable, (hsize_t)1, &(readBuffer[x]));
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if (err < 0)
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goto out;
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printf("Packet %d's value is %d\n", x, readBuffer[x]);
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}
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/* Close the packet table */
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err = H5PTclose(ptable);
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if (err < 0)
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goto out;
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/* Close the file */
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H5Fclose(fid);
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return 0;
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out: /* An error has occurred. Clean up and exit. */
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H5PTclose(ptable);
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H5Fclose(fid);
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return -1;
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}
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