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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf5.h"
#include <stdlib.h>
/*-------------------------------------------------------------------------
* Packet Table Fixed-Length Example
*
* Example program that creates a packet table and performs
* writes and reads.
*
*-------------------------------------------------------------------------
*/
int main(void)
{
hid_t fid; /* File identifier */
hid_t ptable; /* Packet table identifier */
herr_t err; /* Function return status */
hsize_t count; /* Number of records in the table */
int x; /* Loop variable */
/* Buffers to hold data */
int writeBuffer[5];
int readBuffer[5];
hsize_t nrecords;
hsize_t chunk_size=1;
/* Initialize buffers */
for(x=0; x<5; x++)
{
writeBuffer[x]=x;
readBuffer[x] = -1;
}
/* Create a file using default properties */
fid=H5Fcreate("packet_table_FLexample.h5",H5F_ACC_TRUNC,H5P_DEFAULT,H5P_DEFAULT);
/* Create a fixed-length packet table within the file */
/* This table's "packets" will be simple integers. */
ptable = H5PTcreate_fl(fid, "Packet Test Dataset", H5T_NATIVE_INT, chunk_size);
if(ptable == H5I_INVALID_HID)
goto out;
nrecords=1;
/* Write one packet to the packet table */
err = H5PTappend(ptable, nrecords, &(writeBuffer[0]) );
if(err < 0)
goto out;
nrecords=4;
/* Write several packets to the packet table */
err = H5PTappend(ptable, nrecords, &(writeBuffer[1]) );
if(err < 0)
goto out;
/* Get the number of packets in the packet table. This should be five. */
err = H5PTget_num_packets(ptable, &count);
if(err < 0)
goto out;
printf("Number of packets in packet table after five appends: %d\n", count);
/* Initialize packet table's "current record" */
err = H5PTcreate_index(ptable);
if(err < 0)
goto out;
nrecords=1;
/* Iterate through packets, read each one back */
for(x=0; x<5; x++)
{
err = H5PTget_next(ptable, nrecords, &(readBuffer[x]) );
if(err < 0)
goto out;
printf("Packet %d's value is %d\n", x, readBuffer[x]);
}
/* Close the packet table */
err = H5PTclose(ptable);
if(err < 0)
goto out;
/* Close the file */
H5Fclose(fid);
return 0;
out: /* An error has occurred. Clean up and exit. */
H5PTclose(ptable);
H5Fclose(fid);
return -1;
}
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