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I'm trying to open an hdf5 dataset in c without knowing the dataset type. I can get the dataset type using "H5Dget_type(dataset_id)", however, when I want to allocate memory to the data array, i.e. "datatype(int, float, etc.) dset[n]", I cannot do it without knowing the datatype(int, float, etc.).

So, my question is that how can I get the data type in order to use it to allocate memory to the array which I'm going to use?

Thank!

c hdf5

share|improve this question

asked Mar 24 at 15:39

RezaReza

1

add a comment | 

0

I'm trying to open an hdf5 dataset in c without knowing the dataset type. I can get the dataset type using "H5Dget_type(dataset_id)", however, when I want to allocate memory to the data array, i.e. "datatype(int, float, etc.) dset[n]", I cannot do it without knowing the datatype(int, float, etc.).

So, my question is that how can I get the data type in order to use it to allocate memory to the array which I'm going to use?

Thank!

c hdf5

share|improve this question

asked Mar 24 at 15:39

RezaReza

1

add a comment | 

I'm trying to open an hdf5 dataset in c without knowing the dataset type. I can get the dataset type using "H5Dget_type(dataset_id)", however, when I want to allocate memory to the data array, i.e. "datatype(int, float, etc.) dset[n]", I cannot do it without knowing the datatype(int, float, etc.).

So, my question is that how can I get the data type in order to use it to allocate memory to the array which I'm going to use?

Thank!

c hdf5

share|improve this question

asked Mar 24 at 15:39

RezaReza

1

share|improve this question

asked Mar 24 at 15:39

RezaReza

1

share|improve this question

asked Mar 24 at 15:39

RezaReza

1

asked Mar 24 at 15:39

RezaReza

1

asked Mar 24 at 15:39

RezaReza

1

1 Answer
1

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0

If you are not bound to a particular tool, check out HDFql as this will alleviate you from low-level details when dealing with HDF5 files. Your problem may be solved using HDFql in C as follows (assume you want to read dataset my_dataset):

// declare variables
void *data;
long long size;

// get size (in bytes) of dataset "my_dataset" and populate HDFql default cursor with it
hdfql_execute("SHOW SIZE my_dataset");

// move HDFql default cursor to first position
hdfql_cursor_first(NULL);

// retrieve size (in bytes) from HDFql default cursor
size = hdfql_cursor_get_bigint(NULL);

// allocate memory based on the size (in bytes) of dataset "my_dataset"
data = malloc(size);

// register variable "data" for subsequent usage
hdfql_variable_register(&data);

// select (i.e. read) data from dataset "my_dataset" and populate variable "data" with it
hdfql_execute("SELECT FROM my_dataset INTO MEMORY 0");

// from this point on, variable "data" contains the data from "my_dataset"

share|improve this answer

edited Mar 28 at 15:29

answered Mar 28 at 15:03

SOGSOG

1722

add a comment | 

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0

If you are not bound to a particular tool, check out HDFql as this will alleviate you from low-level details when dealing with HDF5 files. Your problem may be solved using HDFql in C as follows (assume you want to read dataset my_dataset):

// declare variables
void *data;
long long size;

// get size (in bytes) of dataset "my_dataset" and populate HDFql default cursor with it
hdfql_execute("SHOW SIZE my_dataset");

// move HDFql default cursor to first position
hdfql_cursor_first(NULL);

// retrieve size (in bytes) from HDFql default cursor
size = hdfql_cursor_get_bigint(NULL);

// allocate memory based on the size (in bytes) of dataset "my_dataset"
data = malloc(size);

// register variable "data" for subsequent usage
hdfql_variable_register(&data);

// select (i.e. read) data from dataset "my_dataset" and populate variable "data" with it
hdfql_execute("SELECT FROM my_dataset INTO MEMORY 0");

// from this point on, variable "data" contains the data from "my_dataset"

share|improve this answer

edited Mar 28 at 15:29

answered Mar 28 at 15:03

SOGSOG

1722

add a comment | 

0

If you are not bound to a particular tool, check out HDFql as this will alleviate you from low-level details when dealing with HDF5 files. Your problem may be solved using HDFql in C as follows (assume you want to read dataset my_dataset):

// declare variables
void *data;
long long size;

// get size (in bytes) of dataset "my_dataset" and populate HDFql default cursor with it
hdfql_execute("SHOW SIZE my_dataset");

// move HDFql default cursor to first position
hdfql_cursor_first(NULL);

// retrieve size (in bytes) from HDFql default cursor
size = hdfql_cursor_get_bigint(NULL);

// allocate memory based on the size (in bytes) of dataset "my_dataset"
data = malloc(size);

// register variable "data" for subsequent usage
hdfql_variable_register(&data);

// select (i.e. read) data from dataset "my_dataset" and populate variable "data" with it
hdfql_execute("SELECT FROM my_dataset INTO MEMORY 0");

// from this point on, variable "data" contains the data from "my_dataset"

share|improve this answer

edited Mar 28 at 15:29

answered Mar 28 at 15:03

SOGSOG

1722

add a comment | 

If you are not bound to a particular tool, check out HDFql as this will alleviate you from low-level details when dealing with HDF5 files. Your problem may be solved using HDFql in C as follows (assume you want to read dataset my_dataset):

// declare variables
void *data;
long long size;

// get size (in bytes) of dataset "my_dataset" and populate HDFql default cursor with it
hdfql_execute("SHOW SIZE my_dataset");

// move HDFql default cursor to first position
hdfql_cursor_first(NULL);

// retrieve size (in bytes) from HDFql default cursor
size = hdfql_cursor_get_bigint(NULL);

// allocate memory based on the size (in bytes) of dataset "my_dataset"
data = malloc(size);

// register variable "data" for subsequent usage
hdfql_variable_register(&data);

// select (i.e. read) data from dataset "my_dataset" and populate variable "data" with it
hdfql_execute("SELECT FROM my_dataset INTO MEMORY 0");

// from this point on, variable "data" contains the data from "my_dataset"

share|improve this answer

edited Mar 28 at 15:29

answered Mar 28 at 15:03

SOGSOG

1722

// declare variables
void *data;
long long size;

// get size (in bytes) of dataset "my_dataset" and populate HDFql default cursor with it
hdfql_execute("SHOW SIZE my_dataset");

// move HDFql default cursor to first position
hdfql_cursor_first(NULL);

// retrieve size (in bytes) from HDFql default cursor
size = hdfql_cursor_get_bigint(NULL);

// allocate memory based on the size (in bytes) of dataset "my_dataset"
data = malloc(size);

// register variable "data" for subsequent usage
hdfql_variable_register(&data);

// select (i.e. read) data from dataset "my_dataset" and populate variable "data" with it
hdfql_execute("SELECT FROM my_dataset INTO MEMORY 0");

// from this point on, variable "data" contains the data from "my_dataset"

share|improve this answer

edited Mar 28 at 15:29

answered Mar 28 at 15:03

SOGSOG

1722

answered Mar 28 at 15:03

SOGSOG

1722

answered Mar 28 at 15:03

SOGSOG

1722