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98 lines
3.5 KiB
98 lines
3.5 KiB
2 years 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 "H5PacketTable.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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const char *FILE_NAME("PTcppexampleFL.h5");
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const char *PT_NAME("/examplePacketTable");
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int
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main(void)
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{
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herr_t err; /* Return value from function calls */
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hid_t fileID; /* HDF5 identifier for file */
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hid_t plistID; /* HDF5 identifier for property list to use compression */
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hsize_t count; /* Number of records in table */
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int x; /* Temporary counter variable */
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/* Buffers to hold data */
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int readBuffer[5];
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int writeBuffer[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 new HDF5 file */
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fileID = H5Fcreate(FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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if (fileID < 0)
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fprintf(stderr, "Couldn't create file.\n");
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/* Prepare property list to set compression, randomly use deflate
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with compression level 5. */
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plistID = H5Pcreate(H5P_DATASET_CREATE);
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err = H5Pset_deflate(plistID, 5);
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if (err < 0)
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fprintf(stderr, "Error setting compression level.");
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/* Create a fixed-length packet table. */
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FL_PacketTable ptable(fileID, plistID, PT_NAME, H5T_NATIVE_INT, 100);
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if (!ptable.IsValid())
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fprintf(stderr, "Unable to create packet table.");
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/* Append five packets to the packet table, one at a time */
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for (x = 0; x < 5; x++) {
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err = ptable.AppendPacket(&(writeBuffer[x]));
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if (err < 0)
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fprintf(stderr, "Error adding record.");
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}
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/* Get the number of packets in the packet table. This should be five. */
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count = ptable.GetPacketCount(err);
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if (err < 0)
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fprintf(stderr, "Error getting packet count.");
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printf("Number of packets in packet table after five appends: %llu\n", count);
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/* Initialize packet table's "current record" */
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ptable.ResetIndex();
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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 = ptable.GetNextPacket(&(readBuffer[x]));
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if (err < 0)
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fprintf(stderr, "Error reading record.");
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printf("Packet %d's value is %d.\n", x, readBuffer[x]);
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}
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/* The packet table will close automatically when its object goes */
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/* out of scope. */
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err = H5Fclose(fileID);
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if (err < 0)
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fprintf(stderr, "Failed to close file.\n");
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return 0;
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}
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