How Do I

Attributes

Create a root group attribute: C

Datasets

Read in floating point values from a text file and create an HDF5 file and dataset and add the values to the dataset:  C   float.txt

Example of reading large dataset by chunk size to help with performance: C

Create a file family: C

Datatypes

Create a variable length string attribute with Unicode name and value: C

Create simple fixed length string, read back and get size and storage size of string: C

Create a fixed length string dataset with a Unicode name and value: C

Work with array datatypes: C  (See H5T_ARRAY Datatype for the difference between a dataset with an array size/shape (dataspace) and an array datatype.)

• Create an array datatype of variable length strings
• Create an array datatype of integer and long
• Create an array datatype of compound of a variable length string and integer

General

Check for an existing object in a file:  (H5Lexists)

Turn off error messaging: (H5Eset_auto2)

Turn on error messaging in the HDF5 tools such as h5ls or h5dump: (specify --enable-error-stack)

Store a binary object (such as a PDF or MS Word document) in an HDF5 file?  Click here.

• Writing a user block in an HDF5 file:  C
• Reading the user block file from the HDF5 file without the HDF5 library: C

Parallel

Open and read a dataset in different groups with different ranks: F90

Selecting a Subset

Append to 2D dataset by column: C

Append to 2D dataset by row: C

Append to a compound dataset in a loop: C

Append to compound enum dataset:         C

Append to variable length string dataset: C

Read 2D dataset by column: C

Read 2D dataset by row: C

Select a subset from a 1D integer dataset: C

Select a subset from a 3D integer dataset: C

Select a subset from a 4D integer dataset: C

Compound

Append to a compound dataset in a loop: C

Create/write a compound enum dataset:   C

Append to compound enum dataset:         C

Overwrite a field (string) in a compound dataset:   C

Overwrite a field (variable length string) in a compound dataset:         C

Create/write to a compound variable length integer:             C

Create/write to a compound dataset with a variable length string field:  C

Create/write a compound array of variable length strings:    C

Create/write to a compound array of variable length of fixed size strings: C

Read h5ex_t_cmpd.h5 file as a general application might:    C

Read h5ex_t_cpxcmpd.h5 file as a general application might:       C

Create a compound opaque dataset: C

Create a compound of a compound of array of integers (nested): C

Create a compound of a compound of fixed length strings (nested): C

Create a compound of a compound of an array of compound (nested): C

Create a variable  length of compound variable length string:  (h5cpx.c)

Create an array of compound with a 3D array field: (h5arrayb.c)