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| HDF5 Last Updated on 2026-07-28 The HDF5 Field Guide

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H5O_info1_t Struct Reference

`#include <src/H5Opublic.h>`

## Detailed Description

Information struct for object (For H5Oget_info(), H5Oget_info_by_name(), H5Oget_info_by_idx() versions 1 & 2.)

## Data Fields
haddr_t | addr
time_t | atime
time_t | btime
time_t | ctime
unsigned long | fileno
H5O_hdr_info_t | hdr
struct { |
H5_ih_info_t attr |
H5_ih_info_t obj |
} | meta_size
time_t | mtime
hsize_t | num_attrs
unsigned | rc
H5O_type_t | type

## Field Documentation

## ◆ addr

haddr_t addr

Object address in file

## ◆ atime

time_t atime

Access time

## ◆ attr

H5_ih_info_t attr

v2 B-tree & heap for attributes

## ◆ btime

time_t btime

Birth time

## ◆ ctime

time_t ctime

Change time

## ◆ fileno

unsigned long fileno

File number that object is located in. Constant across multiple opens of the same file

## ◆ hdr

H5O_hdr_info_t hdr

Object header information

## ◆ [struct]

struct { ... } meta_size

## ◆ mtime

time_t mtime

Modification time

## ◆ num_attrs

hsize_t num_attrs

Number of attributes attached to object

## ◆ obj

H5_ih_info_t obj

v1/v2 B-tree & local/fractal heap for groups, B-tree for chunked datasets

## ◆ rc

unsigned rc

Reference count of object

## ◆ type

H5O_type_t type

Basic object type (group, dataset, etc.)

The documentation for this struct was generated from the following file:

- src/H5Opublic.h