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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 "H5PacketTable.h"
/*-------------------------------------------------------------------------
* Packet Table Variable-Length Example
*
* Example program that creates a packet table and performs
* writes and reads.
*
*-------------------------------------------------------------------------
*/
int main(void)
{
herr_t err; /* Return value from function calls */
hid_t fileID; /* HDF5 identifier for file */
hsize_t count; /* Number of records in table */
int x; /* Loop variable */
/* This example has two different sizes of "record": longs and shorts */
long longBuffer[5];
short shortBuffer[5];
/* Buffer of hvl_t structs to read back records */
hvl_t readBuffer[5];
/* Initialize buffers */
for(x=0; x<5; x++)
{
longBuffer[x] = -x;
shortBuffer[x] = x;
}
/* Create a new HDF5 file */
fileID = H5Fcreate("PTcppexampleVL.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
if(fileID <0)
fprintf(stderr, "Couldn't create file.\n");
/* Create a variable-length packet table. */
VL_PacketTable ptable(fileID, "/examplePacketTable", 1);
if(! ptable.IsValid())
fprintf(stderr, "Unable to create packet table.");
/* Append five packets to the packet table. */
/* In C++, there is no need to package data into hvl_t structs. */
err = ptable.AppendPacket( &(longBuffer[0]), sizeof(long));
if(err < 0)
fprintf(stderr, "Error adding record.");
err = ptable.AppendPacket( &(shortBuffer[1]), sizeof(short));
if(err < 0)
fprintf(stderr, "Error adding record.");
err = ptable.AppendPacket( &(longBuffer[2]), sizeof(long));
if(err < 0)
fprintf(stderr, "Error adding record.");
err = ptable.AppendPacket( &(longBuffer[3]), sizeof(long));
if(err < 0)
fprintf(stderr, "Error adding record.");
err = ptable.AppendPacket( &(shortBuffer[4]), sizeof(short));
if(err < 0)
fprintf(stderr, "Error adding record.");
/* Get the number of packets in the packet table. This should be five. */
count = ptable.GetPacketCount(err);
if(err < 0)
fprintf(stderr, "Error getting packet count.");
printf("Number of packets in packet table after five appends: %d\n", count);
/* Initialize packet table's "current record" */
ptable.ResetIndex();
/* Iterate through packets, read each one back */
for(int x=0; x<5; x++)
{
err = ptable.GetNextPacket( &(readBuffer[x]) );
if(err < 0)
fprintf(stderr, "Error reading record.");
printf("Packet %d's length is %d.\n", x, readBuffer[x].len);
if(readBuffer[x].len == sizeof(long))
printf("Packet %d's value is %d.\n", x, *((long *) readBuffer[x].p) );
else
printf("Packet %d's value is %d.\n", x, *((short *) readBuffer[x].p) );
}
/* The packet table will close automatically when its object goes */
/* out of scope. */
err = H5Fclose(fileID);
if( err < 0 )
fprintf(stderr, "Failed to close file.\n");
return 0;
}
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