gcc/ada/g-regist.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                         G N A T . R E G I S T R Y                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2001-2003 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  The registry is a Windows database to store key/value pair. It is used
  34 --  to keep Windows operation system and applications configuration options.
  35 --  The database is a hierarchal set of key and for each key a value can
  36 --  be associated. This package provides high level routines to deal with
  37 --  the Windows registry. For full registry API, but at a lower level of
  38 --  abstraction, refer to the Win32.Winreg package provided with the
  39 --  Win32Ada binding. For example this binding handle only key values of
  40 --  type Standard.String.
  41
  42 --  This package is specific to the NT version of GNAT, and is not available
  43 --  on any other platforms.
  44
  45 package GNAT.Registry is
  46
  47    type HKEY is private;
  48    --  HKEY is a handle to a registry key, including standard registry keys:
  49    --  HKEY_CLASSES_ROOT, HKEY_CURRENT_CONFIG, HKEY_CURRENT_USER,
  50    --  HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_PERFORMANCE_DATA.
  51
  52    HKEY_CLASSES_ROOT     : constant HKEY;
  53    HKEY_CURRENT_USER     : constant HKEY;
  54    HKEY_CURRENT_CONFIG   : constant HKEY;
  55    HKEY_LOCAL_MACHINE    : constant HKEY;
  56    HKEY_USERS            : constant HKEY;
  57    HKEY_PERFORMANCE_DATA : constant HKEY;
  58
  59    type Key_Mode is (Read_Only, Read_Write);
  60    --  Access mode for the registry key.
  61
  62    Registry_Error : exception;
  63    --  Registry_Error is raises by all routines below if a problem occurs
  64    --  (key cannot be opened, key cannot be found etc).
  65
  66    function Create_Key
  67      (From_Key : HKEY;
  68       Sub_Key  : String;
  69       Mode     : Key_Mode := Read_Write)
  70       return     HKEY;
  71    --  Open or create a key (named Sub_Key) in the Windows registry database.
  72    --  The key will be created under key From_Key. It returns the key handle.
  73    --  From_Key must be a valid handle to an already opened key or one of
  74    --  the standard keys identified by HKEY declarations above.
  75
  76    function Open_Key
  77      (From_Key : HKEY;
  78       Sub_Key  : String;
  79       Mode     : Key_Mode := Read_Only)
  80       return     HKEY;
  81    --  Return a registry key handle for key named Sub_Key opened under key
  82    --  From_Key. It is possible to open a key at any level in the registry
  83    --  tree in a single call to Open_Key.
  84
  85    procedure Close_Key (Key : HKEY);
  86    --  Close registry key handle. All resources used by Key are released.
  87
  88    function Key_Exists (From_Key : HKEY; Sub_Key : String) return Boolean;
  89    --  Returns True if Sub_Key is defined under From_Key in the registry.
  90
  91    function Query_Value
  92      (From_Key : HKEY;
  93       Sub_Key  : String;
  94       Expand   : Boolean := False)
  95       return     String;
  96    --  Returns the registry key's value associated with Sub_Key in From_Key
  97    --  registry key. If Expand is set to True and the Sub_Key is a
  98    --  REG_EXPAND_SZ the returned value will have the %name% variables
  99    --  replaced by the corresponding environment variable value.
 100
 101    procedure Set_Value (From_Key : HKEY; Sub_Key : String; Value : String);
 102    --  Add the pair (Sub_Key, Value) into From_Key registry key.
 103
 104    procedure Delete_Key (From_Key : HKEY; Sub_Key : String);
 105    --  Remove Sub_Key from the registry key From_Key.
 106
 107    procedure Delete_Value (From_Key : HKEY; Sub_Key : String);
 108    --  Remove the named value Sub_Key from the registry key From_Key.
 109
 110    generic
 111       with procedure Action
 112         (Index   : Positive;
 113          Sub_Key : String;
 114          Value   : String;
 115          Quit    : in out Boolean);
 116    procedure For_Every_Key_Value (From_Key : HKEY; Expand : Boolean := False);
 117    --  Iterates over all the pairs (Sub_Key, Value) registered under
 118    --  From_Key. Index will be set to 1 for the first key and will be
 119    --  incremented by one in each iteration. Quit can be set to True to
 120    --  stop iteration; its initial value is False.
 121    --
 122    --  Key value that are not of type string (i.e. not REG_SZ / REG_EXPAND_SZ)
 123    --  are skipped. In this case, the iterator behaves exactly as if the key
 124    --  were not present. Note that you must use the Win32.Winreg API to deal
 125    --  with this case. Furthermore, if Expand is set to True and the Sub_Key
 126    --  is a REG_EXPAND_SZ the returned value will have the %name% variables
 127    --  replaced by the corresponding environment variable value.
 128
 129 private
 130
 131    type HKEY is mod 2 ** Integer'Size;
 132
 133    HKEY_CLASSES_ROOT     : constant HKEY := 16#80000000#;
 134    HKEY_CURRENT_USER     : constant HKEY := 16#80000001#;
 135    HKEY_LOCAL_MACHINE    : constant HKEY := 16#80000002#;
 136    HKEY_USERS            : constant HKEY := 16#80000003#;
 137    HKEY_PERFORMANCE_DATA : constant HKEY := 16#80000004#;
 138    HKEY_CURRENT_CONFIG   : constant HKEY := 16#80000005#;
 139
 140 end GNAT.Registry;