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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . R E G I S T R Y --
-- --
-- S p e c --
-- --
-- Copyright (C) 2001-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- The registry is a Windows database to store key/value pair. It is used
-- to keep Windows operation system and applications configuration options.
-- The database is a hierarchal set of key and for each key a value can
-- be associated. This package provides high level routines to deal with
-- the Windows registry. For full registry API, but at a lower level of
-- abstraction, refer to the Win32.Winreg package provided with the
-- Win32Ada binding. For example this binding handle only key values of
-- type Standard.String.
-- This package is specific to the NT version of GNAT, and is not available
-- on any other platforms.
package GNAT.Registry is
type HKEY is private;
-- HKEY is a handle to a registry key, including standard registry keys:
-- HKEY_CLASSES_ROOT, HKEY_CURRENT_CONFIG, HKEY_CURRENT_USER,
-- HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_PERFORMANCE_DATA.
HKEY_CLASSES_ROOT : constant HKEY;
HKEY_CURRENT_USER : constant HKEY;
HKEY_CURRENT_CONFIG : constant HKEY;
HKEY_LOCAL_MACHINE : constant HKEY;
HKEY_USERS : constant HKEY;
HKEY_PERFORMANCE_DATA : constant HKEY;
type Key_Mode is (Read_Only, Read_Write);
-- Access mode for the registry key
Registry_Error : exception;
-- Registry_Error is raises by all routines below if a problem occurs
-- (key cannot be opened, key cannot be found etc).
function Create_Key
(From_Key : HKEY;
Sub_Key : String;
Mode : Key_Mode := Read_Write) return HKEY;
-- Open or create a key (named Sub_Key) in the Windows registry database.
-- The key will be created under key From_Key. It returns the key handle.
-- From_Key must be a valid handle to an already opened key or one of
-- the standard keys identified by HKEY declarations above.
function Open_Key
(From_Key : HKEY;
Sub_Key : String;
Mode : Key_Mode := Read_Only) return HKEY;
-- Return a registry key handle for key named Sub_Key opened under key
-- From_Key. It is possible to open a key at any level in the registry
-- tree in a single call to Open_Key.
procedure Close_Key (Key : HKEY);
-- Close registry key handle. All resources used by Key are released
function Key_Exists (From_Key : HKEY; Sub_Key : String) return Boolean;
-- Returns True if Sub_Key is defined under From_Key in the registry
function Query_Value
(From_Key : HKEY;
Sub_Key : String;
Expand : Boolean := False) return String;
-- Returns the registry key's value associated with Sub_Key in From_Key
-- registry key. If Expand is set to True and the Sub_Key is a
-- REG_EXPAND_SZ the returned value will have the %name% variables
-- replaced by the corresponding environment variable value.
procedure Set_Value
(From_Key : HKEY;
Sub_Key : String;
Value : String;
Expand : Boolean := False);
-- Add the pair (Sub_Key, Value) into From_Key registry key.
-- By default the value created is of type REG_SZ, unless
-- Expand is True in which case it is of type REG_EXPAND_SZ
procedure Delete_Key (From_Key : HKEY; Sub_Key : String);
-- Remove Sub_Key from the registry key From_Key
procedure Delete_Value (From_Key : HKEY; Sub_Key : String);
-- Remove the named value Sub_Key from the registry key From_Key
generic
with procedure Action
(Index : Positive;
Key : HKEY;
Key_Name : String;
Quit : in out Boolean);
procedure For_Every_Key (From_Key : HKEY; Recursive : Boolean := False);
-- Iterates over all the keys registered under From_Key, recursively if
-- Recursive is set to True. Index will be set to 1 for the first key and
-- will be incremented by one in each iteration. The current key of an
-- iteration is set in Key, and its name - in Key_Name. Quit can be set
-- to True to stop iteration; its initial value is False.
generic
with procedure Action
(Index : Positive;
Sub_Key : String;
Value : String;
Quit : in out Boolean);
procedure For_Every_Key_Value (From_Key : HKEY; Expand : Boolean := False);
-- Iterates over all the pairs (Sub_Key, Value) registered under
-- From_Key. Index will be set to 1 for the first key and will be
-- incremented by one in each iteration. Quit can be set to True to
-- stop iteration; its initial value is False.
--
-- Key value that are not of type string (i.e. not REG_SZ / REG_EXPAND_SZ)
-- are skipped. In this case, the iterator behaves exactly as if the key
-- were not present. Note that you must use the Win32.Winreg API to deal
-- with this case. Furthermore, if Expand is set to True and the Sub_Key
-- is a REG_EXPAND_SZ the returned value will have the %name% variables
-- replaced by the corresponding environment variable value.
--
-- This iterator can be used in conjunction with For_Every_Key in
-- order to analyze all subkeys and values of a given registry key.
private
type HKEY is mod 2 ** Integer'Size;
HKEY_CLASSES_ROOT : constant HKEY := 16#80000000#;
HKEY_CURRENT_USER : constant HKEY := 16#80000001#;
HKEY_LOCAL_MACHINE : constant HKEY := 16#80000002#;
HKEY_USERS : constant HKEY := 16#80000003#;
HKEY_PERFORMANCE_DATA : constant HKEY := 16#80000004#;
HKEY_CURRENT_CONFIG : constant HKEY := 16#80000005#;
end GNAT.Registry;
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