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Diffstat (limited to 'hl/examples/ptExampleFL.c')
-rw-r--r-- | hl/examples/ptExampleFL.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/hl/examples/ptExampleFL.c b/hl/examples/ptExampleFL.c new file mode 100644 index 0000000..ba7a3a0 --- /dev/null +++ b/hl/examples/ptExampleFL.c @@ -0,0 +1,104 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by The HDF Group. * + * 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 COPYING file, which can be found at the root of the source code * + * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. * + * If you do not have access to either file, you may request a copy from * + * help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +#include "hdf5_hl.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]; + + /* 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 and it will use compression + * level 5. */ + ptable = H5PTcreate_fl(fid, "Packet Test Dataset", H5T_NATIVE_INT, (hsize_t)100, 5); + if(ptable == H5I_INVALID_HID) + goto out; + + /* Write one packet to the packet table */ + err = H5PTappend(ptable, (hsize_t)1, &(writeBuffer[0]) ); + if(err < 0) + goto out; + + /* Write several packets to the packet table */ + err = H5PTappend(ptable, (hsize_t)4, &(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", (int)count); + + /* Initialize packet table's "current record" */ + err = H5PTcreate_index(ptable); + if(err < 0) + goto out; + + /* Iterate through packets, read each one back */ + for(x=0; x<5; x++) + { + err = H5PTget_next(ptable, (hsize_t)1, &(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; +} + |