GWin32RegistryKey: GIO Reference Manual

## GWin32RegistryKey GWin32RegistryKey — W32 registry access helper |

## Includes

    #include <gio/win32/gwin32registrykey.h>

## Description

GWin32RegistryKey represents a single Windows Registry key.

GWin32RegistryKey is used by a number of helper functions that read Windows Registry. All keys are opened with read-only access, and at the moment there is no API for writing into registry keys or creating new ones.

GWin32RegistryKey implements the GInitable interface, so if it is manually constructed by e.g. `g_object_new()` you must call `g_initable_init()` and check the results before using the object. This is done automatically in `g_win32_registry_key_new()` and `g_win32_registry_key_get_child()`, so these functions can return `NULL`.

To increase efficiency, a UTF-16 variant is available for all functions that deal with key or value names in the registry. Use these to perform deep registry queries or other operations that require querying a name of a key or a value and then opening it (or querying its data). The use of UTF-16 functions avoids the overhead of converting names to UTF-8 and back.

All functions operate in current user's context (it is not possible to access registry tree of a different user).

Key paths must use '\' as a separator, '/' is not supported. Key names must not include '\', because it's used as a separator. Value names can include '\'.

Key and value names are not case sensitive.

Full key name (excluding the pre-defined ancestor's name) can't exceed 255 UTF-16 characters, give or take. Value name can't exceed 16383 UTF-16 characters. Tree depth is limited to 512 levels.

## Functions

## Types and Values