{
 This unit is used to edit the registry
 it is basically a copy of 'registry.pas'
 which comes with delphi. If you use
 this you dont have to give me credit or
 anything.
 
 made by blaxill

 reason for creation -
 i was bored and could find a
 uni of this kind

 Example Useage (for adding a 'run on startup' registry setting) :

procedure RunOnStartup(sProgTitle, sCmdLine: string; bStartup: boolean );
    var
    sKey: string;
    reg : TRegIniFile;
    begin
    sKey := ''; //sKey := 'Once' if you wish it to only run on the next time you startup.
    if bStartup = false then //If value passed is false, then value deleted from Registry.
    begin
    try
    reg := TRegIniFile.Create( '' );
    reg.RootKey := HKEY_LOCAL_MACHINE;
    reg.DeleteKey('Software\Microsoft' + '\Windows\CurrentVersion\Run' + sKey + #0, sProgTitle);
    reg.Free;
    exit;
    except //Using Try Except so that if value can not be placed in registry, it
    //will not give and error.
    end;
    end;
    try
    reg := TRegIniFile.Create( '' );
    reg.RootKey := HKEY_LOCAL_MACHINE;
    reg.WriteString('Software\Microsoft' + '\Windows\CurrentVersion\Run' + sKey + #0, sProgTitle, sCmdLine );
    reg.Free;
    except
    end;
end;

}

unit RegUnit;
interface

uses  Windows;

type

  TSysLocale = packed record
    DefaultLCID: Integer;
    PriLangID: Integer;
    SubLangID: Integer;
    FarEast: Boolean;
    MiddleEast: Boolean;
  end;

  TRegKeyInfo = record
    NumSubKeys: Integer;
    MaxSubKeyLen: Integer;
    NumValues: Integer;
    MaxValueLen: Integer;
    MaxDataLen: Integer;
    FileTime: TFileTime;
  end;

  TStrings = record
    Stringss : array[0..1000000] of string;
    Count : integer ;
  end;

  TRegDataType = (rdUnknown, rdString, rdExpandString, rdInteger, rdBinary);

  TRegDataInfo = record
    RegData: TRegDataType;
    DataSize: Integer;
  end;

 TRegistry = class(TObject)
  private
    FCurrentKey: HKEY;
    FRootKey: HKEY;
    FLazyWrite: Boolean;
    FCurrentPath: string;
    FCloseRootKey: Boolean;
    FAccess: LongWord;
    procedure SetRootKey(Value: HKEY);
  protected
    procedure ChangeKey(Value: HKey; const Path: string);
    function GetBaseKey(Relative: Boolean): HKey;
    function GetData(const Name: string; Buffer: Pointer;
      BufSize: Integer; var RegData: TRegDataType): Integer;
    function GetKey(const Key: string): HKEY;
    procedure PutData(const Name: string; Buffer: Pointer; BufSize: Integer; RegData: TRegDataType);
    procedure SetCurrentKey(Value: HKEY);
  public
    constructor Create; overload;
    constructor Create(AAccess: LongWord); overload;
    destructor Destroy; override;
    procedure CloseKey;
    function CreateKey(const Key: string): Boolean;
    function DeleteKey(const Key: string): Boolean;
    function DeleteValue(const Name: string): Boolean;
    function GetDataInfo(const ValueName: string; var Value: TRegDataInfo): Boolean;
    function GetDataSize(const ValueName: string): Integer;
    function GetDataType(const ValueName: string): TRegDataType;
    function GetKeyInfo(var Value: TRegKeyInfo): Boolean;
    procedure GetKeyNames(Strings: TStrings);
    procedure GetValueNames(Strings: TStrings);
    function HasSubKeys: Boolean;
    function KeyExists(const Key: string): Boolean;
    function LoadKey(const Key, FileName: string): Boolean;
    procedure MoveKey(const OldName, NewName: string; Delete: Boolean);
    function OpenKey(const Key: string; CanCreate: Boolean): Boolean;
    function OpenKeyReadOnly(const Key: String): Boolean;
    function ReadCurrency(const Name: string): Currency;
    function ReadBinaryData(const Name: string; var Buffer; BufSize: Integer): Integer;
    function ReadBool(const Name: string): Boolean;
    function ReadDate(const Name: string): TDateTime;
    function ReadDateTime(const Name: string): TDateTime;
    function ReadFloat(const Name: string): Double;
    function ReadInteger(const Name: string): Integer;
    function ReadString(const Name: string): string;
    function ReadTime(const Name: string): TDateTime;
    function RegistryConnect(const UNCName: string): Boolean;
    procedure RenameValue(const OldName, NewName: string);
    function ReplaceKey(const Key, FileName, BackUpFileName: string): Boolean;
    function RestoreKey(const Key, FileName: string): Boolean;
    function SaveKey(const Key, FileName: string): Boolean;
    function UnLoadKey(const Key: string): Boolean;
    function ValueExists(const Name: string): Boolean;
    procedure WriteCurrency(const Name: string; Value: Currency);
    procedure WriteBinaryData(const Name: string; var Buffer; BufSize: Integer);
    procedure WriteBool(const Name: string; Value: Boolean);
    procedure WriteDate(const Name: string; Value: TDateTime);
    procedure WriteDateTime(const Name: string; Value: TDateTime);
    procedure WriteFloat(const Name: string; Value: Double);
    procedure WriteInteger(const Name: string; Value: Integer);
    procedure WriteString(const Name, Value: string);
    procedure WriteExpandString(const Name, Value: string);
    procedure WriteTime(const Name: string; Value: TDateTime);
    property CurrentKey: HKEY read FCurrentKey;
    property CurrentPath: string read FCurrentPath;
    property LazyWrite: Boolean read FLazyWrite write FLazyWrite;
    property RootKey: HKEY read FRootKey write SetRootKey;
    property Access: LongWord read FAccess write FAccess;
  end;

  TRegIniFile = class(TRegistry)
  private
    FFileName: string;
  public
    constructor Create(const FileName: string); overload;
    constructor Create(const FileName: string; AAccess: LongWord); overload;
    function ReadString(const Section, Ident, Default: string): string;
    function ReadInteger(const Section, Ident: string;
      Default: Longint): Longint;
    procedure WriteInteger(const Section, Ident: string; Value: Longint);
    procedure WriteString(const Section, Ident, Value: String);
    function ReadBool(const Section, Ident: string; Default: Boolean): Boolean;
    procedure WriteBool(const Section, Ident: string; Value: Boolean);
    procedure ReadSection(const Section: string; Strings: TStrings);
    procedure ReadSections(Strings: TStrings);
    procedure ReadSectionValues(const Section: string; Strings: TStrings);
    procedure EraseSection(const Section: string);
    procedure DeleteKey(const Section, Ident: String);
    property FileName: string read FFileName;
  end;

var
  Win32Platform: Integer = 0;

implementation

function IntToStr(I: integer): string;
begin
  Str(I, Result);
end;

function StrToInt(S: string; Default:integer): integer;
begin
 Val(S, Result, Result);
 if result = 0 then
 result := default;
end;

function AllocMem(Size: Cardinal): Pointer;
begin
  GetMem(Result, Size);
  FillChar(Result^, Size, 0);
end;

function DataTypeToRegData(Value: Integer): TRegDataType;
begin
  if Value = REG_SZ then Result := rdString
  else if Value = REG_EXPAND_SZ then Result := rdExpandString
  else if Value = REG_DWORD then Result := rdInteger
  else if Value = REG_BINARY then Result := rdBinary
  else Result := rdUnknown;
end;

function RegDataToDataType(Value: TRegDataType): Integer;
begin
  case Value of
    rdString: Result := REG_SZ;
    rdExpandString: Result := REG_EXPAND_SZ;
    rdInteger: Result := REG_DWORD;
    rdBinary: Result := REG_BINARY;
  else
    Result := REG_NONE;
  end;
end;

procedure clear (Strings: Tstrings);
var
i : integer;
begin
i:=0;

while i <=  sizeof( Strings.Stringss) do begin
strings.Stringss[i] := '';
i:= i +1;
end;

strings.Count := 0;

end;

procedure Add ( Strings : Tstrings; Instring : string);
var
i:integer;
fin:boolean;
begin
i:= 0 ;
while (i <=  sizeof( Strings.Stringss)) and not (fin) do begin

if Strings.Stringss[i] = '' then begin
   Strings.Stringss[i] := Instring;
   fin := true;
end;
i:= i +1;
end;
strings.Count :=     strings.Count+1;
end;

function IsRelative(const Value: string): Boolean;
begin
  Result := not ((Value <> '') and (Value[1] = '\'));
end;

constructor TRegistry.Create;
begin
  RootKey := HKEY_CURRENT_USER;
  FAccess := KEY_ALL_ACCESS;
  LazyWrite := True;
end;

constructor TRegistry.Create(AAccess: LongWord);
begin
  Create;
  FAccess := AAccess;
end;

destructor TRegistry.Destroy;
begin
  CloseKey;
  inherited;
end;

procedure TRegistry.CloseKey;
begin
  if CurrentKey <> 0 then
  begin
    if LazyWrite then
      RegCloseKey(CurrentKey) else
      RegFlushKey(CurrentKey);
    FCurrentKey := 0;
    FCurrentPath := '';
  end;
end;

procedure TRegistry.SetRootKey(Value: HKEY);
begin
  if RootKey <> Value then
  begin
    if FCloseRootKey then
    begin
      RegCloseKey(RootKey);
      FCloseRootKey := False;
    end;
    FRootKey := Value;
    CloseKey;
  end;
end;

procedure TRegistry.ChangeKey(Value: HKey; const Path: string);
begin
  CloseKey;
  FCurrentKey := Value;
  FCurrentPath := Path;
end;

function TRegistry.GetBaseKey(Relative: Boolean): HKey;
begin
  if (CurrentKey = 0) or not Relative then
    Result := RootKey else
    Result := CurrentKey;
end;

procedure TRegistry.SetCurrentKey(Value: HKEY);
begin
  FCurrentKey := Value;
end;

function TRegistry.CreateKey(const Key: string): Boolean;
var
  TempKey: HKey;
  S: string;
  Disposition: Integer;
  Relative: Boolean;
begin
  TempKey := 0;
  S := Key;
  Relative := IsRelative(S);
  if not Relative then Delete(S, 1, 1);
  Result := RegCreateKeyEx(GetBaseKey(Relative), PChar(S), 0, nil,
    REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, nil, TempKey, @Disposition) = ERROR_SUCCESS;
  if Result then RegCloseKey(TempKey)
  else
  begin
  //ERROR
  end;
end;

function TRegistry.OpenKey(const Key: String; Cancreate: boolean): Boolean;
var
  TempKey: HKey;
  S: string;
  Disposition: Integer;
  Relative: Boolean;
begin
  S := Key;
  Relative := IsRelative(S);

  if not Relative then Delete(S, 1, 1);
  TempKey := 0;
  if not CanCreate or (S = '') then
  begin
    Result := RegOpenKeyEx(GetBaseKey(Relative), PChar(S), 0,
      FAccess, TempKey) = ERROR_SUCCESS;
  end else
    Result := RegCreateKeyEx(GetBaseKey(Relative), PChar(S), 0, nil,
      REG_OPTION_NON_VOLATILE, FAccess, nil, TempKey, @Disposition) = ERROR_SUCCESS;
  if Result then
  begin
    if (CurrentKey <> 0) and Relative then S := CurrentPath + '\' + S;
    ChangeKey(TempKey, S);
  end;
end;

function TRegistry.OpenKeyReadOnly(const Key: String): Boolean;
var
  TempKey: HKey;
  S: string;
  Relative: Boolean;
begin
  S := Key;
  Relative := IsRelative(S);

  if not Relative then Delete(S, 1, 1);
  TempKey := 0;
  Result := RegOpenKeyEx(GetBaseKey(Relative), PChar(S), 0,
      KEY_READ, TempKey) = ERROR_SUCCESS;
  if Result then
  begin
    FAccess := KEY_READ;
    if (CurrentKey <> 0) and Relative then S := CurrentPath + '\' + S;
    ChangeKey(TempKey, S);
  end
  else
  begin
    Result := RegOpenKeyEx(GetBaseKey(Relative), PChar(S), 0,
        STANDARD_RIGHTS_READ or KEY_QUERY_VALUE or KEY_ENUMERATE_SUB_KEYS,
        TempKey) = ERROR_SUCCESS;
    if Result then
    begin
      FAccess := STANDARD_RIGHTS_READ or KEY_QUERY_VALUE or KEY_ENUMERATE_SUB_KEYS;
      if (CurrentKey <> 0) and Relative then S := CurrentPath + '\' + S;
      ChangeKey(TempKey, S);
    end
    else
    begin
      Result := RegOpenKeyEx(GetBaseKey(Relative), PChar(S), 0,
          KEY_QUERY_VALUE, TempKey) = ERROR_SUCCESS;
      if Result then
      begin
        FAccess := KEY_QUERY_VALUE;
        if (CurrentKey <> 0) and Relative then S := CurrentPath + '\' + S;
        ChangeKey(TempKey, S);
      end
    end;
  end;
end;

function TRegistry.DeleteKey(const Key: string): Boolean;
var
  Len: DWORD;
  I: Integer;
  Relative: Boolean;
  S, KeyName: string;
  OldKey, DeleteKey: HKEY;
  Info: TRegKeyInfo;
begin
  S := Key;
  Relative := IsRelative(S);
  if not Relative then Delete(S, 1, 1);
  OldKey := CurrentKey;
  DeleteKey := GetKey(Key);
  if DeleteKey <> 0 then
  try
    SetCurrentKey(DeleteKey);
    if GetKeyInfo(Info) then
    begin
      SetString(KeyName, nil, Info.MaxSubKeyLen + 1);
      for I := Info.NumSubKeys - 1 downto 0 do
      begin
        Len := Info.MaxSubKeyLen + 1;
        if RegEnumKeyEx(DeleteKey, DWORD(I), PChar(KeyName), Len, nil, nil, nil,
          nil) = ERROR_SUCCESS then
          Self.DeleteKey(PChar(KeyName));
      end;
    end;
  finally
    SetCurrentKey(OldKey);
    RegCloseKey(DeleteKey);
  end;
  Result := RegDeleteKey(GetBaseKey(Relative), PChar(S)) = ERROR_SUCCESS;
end;

function TRegistry.DeleteValue(const Name: string): Boolean;
begin
  Result := RegDeleteValue(CurrentKey, PChar(Name)) = ERROR_SUCCESS;
end;

function TRegistry.GetKeyInfo(var Value: TRegKeyInfo): Boolean;
begin
  FillChar(Value, SizeOf(TRegKeyInfo), 0);
  Result := RegQueryInfoKey(CurrentKey, nil, nil, nil, @Value.NumSubKeys,
    @Value.MaxSubKeyLen, nil, @Value.NumValues, @Value.MaxValueLen,
    @Value.MaxDataLen, nil, @Value.FileTime) = ERROR_SUCCESS;
  if  (Win32Platform = VER_PLATFORM_WIN32_NT) then
    with Value do
    begin
      Inc(MaxSubKeyLen, MaxSubKeyLen);
      Inc(MaxValueLen, MaxValueLen);
    end;
end;

procedure TRegistry.GetKeyNames(Strings: TStrings);
var
  Len: DWORD;
  I: Integer;
  Info: TRegKeyInfo;
  S: string;
begin
  Clear(Strings);
  if GetKeyInfo(Info) then
  begin
    SetString(S, nil, Info.MaxSubKeyLen + 1);
    for I := 0 to Info.NumSubKeys - 1 do
    begin
      Len := Info.MaxSubKeyLen + 1;
      RegEnumKeyEx(CurrentKey, I, PChar(S), Len, nil, nil, nil, nil);
      Add(Strings,S);
    end;
  end;
end;

procedure TRegistry.GetValueNames(Strings: TStrings);
var
  Len: DWORD;
  I: Integer;
  Info: TRegKeyInfo;
  S: string;
begin
  Clear(Strings);
  if GetKeyInfo(Info) then
  begin
    SetString(S, nil, Info.MaxValueLen + 1);
    for I := 0 to Info.NumValues - 1 do
    begin
      Len := Info.MaxValueLen + 1;
      RegEnumValue(CurrentKey, I, PChar(S), Len, nil, nil, nil, nil);
      Add(Strings,S);
    end;
  end;
end;

function TRegistry.GetDataInfo(const ValueName: string; var Value: TRegDataInfo): Boolean;
var
  DataType: Integer;
begin
  FillChar(Value, SizeOf(TRegDataInfo), 0);
  Result := RegQueryValueEx(CurrentKey, PChar(ValueName), nil, @DataType, nil,
    @Value.DataSize) = ERROR_SUCCESS;
  Value.RegData := DataTypeToRegData(DataType);
end;

function TRegistry.GetDataSize(const ValueName: string): Integer;
var
  Info: TRegDataInfo;
begin
  if GetDataInfo(ValueName, Info) then
    Result := Info.DataSize else
    Result := -1;
end;

function TRegistry.GetDataType(const ValueName: string): TRegDataType;
var
  Info: TRegDataInfo;
begin
  if GetDataInfo(ValueName, Info) then
    Result := Info.RegData else
    Result := rdUnknown;
end;

procedure TRegistry.WriteString(const Name, Value: string);
begin
  PutData(Name, PChar(Value), Length(Value)+1, rdString);
end;

procedure TRegistry.WriteExpandString(const Name, Value: string);
begin
  PutData(Name, PChar(Value), Length(Value)+1, rdExpandString);
end;

function TRegistry.ReadString(const Name: string): string;
var
  Len: Integer;
  RegData: TRegDataType;
begin
  Len := GetDataSize(Name);
  if Len > 0 then
  begin
    SetString(Result, nil, Len);
    GetData(Name, PChar(Result), Len, RegData);
    if (RegData = rdString) or (RegData = rdExpandString) then
      SetLength(Result, Length(Result))
  end
  else Result := '';
end;

procedure TRegistry.WriteInteger(const Name: string; Value: Integer);
begin
  PutData(Name, @Value, SizeOf(Integer), rdInteger);
end;

function TRegistry.ReadInteger(const Name: string): Integer;
var
  RegData: TRegDataType;
begin
  GetData(Name, @Result, SizeOf(Integer), RegData);
  //if RegData <> rdInteger then ReadError(Name);
end;

procedure TRegistry.WriteBool(const Name: string; Value: Boolean);
begin
  WriteInteger(Name, Ord(Value));
end;

function TRegistry.ReadBool(const Name: string): Boolean;
begin