Replacement for TRegistry

function RegSetString(RootKey: HKEY; Name: String; Value: String): boolean;
function RegSetMultiString(RootKey: HKEY; Name: String; Value: String): boolean;
function RegSetExpandString(RootKey: HKEY; Name: String; Value: String): boolean;
function RegSetDWORD(RootKey: HKEY; Name: String; Value: Cardinal): boolean;
function RegSetBinary(RootKey: HKEY; Name: String; Value: Array of Byte): boolean;
function RegGetString(RootKey: HKEY; Name: String; Var Value: String): boolean;
function RegGetMultiString(RootKey: HKEY; Name: String; Var Value: String): boolean;
function RegGetExpandString(RootKey: HKEY; Name: String; Var Value: String): boolean;
function RegGetDWORD(RootKey: HKEY; Name: String; Var Value: Cardinal): boolean;
function RegGetBinary(RootKey: HKEY; Name: String; Var Value: String): boolean;
function RegGetValueType(RootKey: HKEY; Name: String; var Value: Cardinal): boolean;
function RegValueExists(RootKey: HKEY; Name: String): boolean;
function RegKeyExists(RootKey: HKEY; Name: String): boolean;
function RegDelValue(RootKey: HKEY; Name: String): boolean;
function RegDelKey(RootKey: HKEY; Name: String): boolean;
function RegConnect(MachineName: String; RootKey: HKEY; var RemoteKey: HKEY): boolean;
function RegDisconnect(RemoteKey: HKEY): boolean;
function RegEnumKeys(RootKey: HKEY; Name: String; var KeyList: String): boolean;
function RegEnumValues(RootKey: HKEY; Name: String; var ValueList: String): boolean;

//

function LastPos(Needle: Char; Haystack: String): integer;
begin
  for Result := Length(Haystack) downto 1 do
    if Haystack[Result] = Needle then
      Break;
end;

function RegConnect(MachineName: String; RootKey: HKEY; var RemoteKey: HKEY): boolean;
begin
  Result := (RegConnectRegistry(PChar(MachineName), RootKey, RemoteKey) = ERROR_SUCCESS);
end;

function RegDisconnect(RemoteKey: HKEY): boolean;
begin
  Result := (RegCloseKey(RemoteKey) = ERROR_SUCCESS);
end;

function RegSetValue(RootKey: HKEY; Name: String; ValType: Cardinal; PVal: Pointer; ValSize: Cardinal): boolean;
var
  SubKey: String;
  n: integer;
  dispo: DWORD;
  hTemp: HKEY;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegCreateKeyEx(RootKey, PChar(SubKey), 0, nil, REG_OPTION_NON_VOLATILE, KEY_WRITE,
      nil, hTemp, @dispo) = ERROR_SUCCESS then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      Result := (RegSetValueEx(hTemp, PChar(SubKey), 0, ValType, PVal, ValSize) = ERROR_SUCCESS);
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegGetValue(RootKey: HKEY; Name: String; ValType: Cardinal; var PVal: Pointer;
  var ValSize: Cardinal): boolean;
var
  SubKey: String;
  n: integer;
  MyValType: DWORD;
  hTemp: HKEY;
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_READ, hTemp) = ERROR_SUCCESS then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      if RegQueryValueEx(hTemp, PChar(SubKey), nil, @MyValType, nil, @BufSize) = ERROR_SUCCESS then
      begin
        GetMem(Buf, BufSize);
        if RegQueryValueEx(hTemp, PChar(SubKey), nil, @MyValType, Buf, @BufSize) = ERROR_SUCCESS then
        begin
          if ValType = MyValType then
          begin
            PVal := Buf;
            ValSize := BufSize;
            Result := True;
          end else
          begin
            FreeMem(Buf);
          end;
        end else
        begin
          FreeMem(Buf);
        end;
      end;
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegSetString(RootKey: HKEY; Name: String; Value: String): boolean;
begin
  Result := RegSetValue(RootKey, Name, REG_SZ, PChar(Value + #0), Length(Value) + 1);
end;

function RegSetMultiString(RootKey: HKEY; Name: String; Value: String): boolean;
begin
  Result := RegSetValue(RootKey, Name, REG_MULTI_SZ, PChar(Value + #0#0), Length(Value) + 2);
end;

function RegSetExpandString(RootKey: HKEY; Name: String; Value: String): boolean;
begin
  Result := RegSetValue(RootKey, Name, REG_EXPAND_SZ, PChar(Value + #0), Length(Value) + 1);
end;

function RegSetDword(RootKey: HKEY; Name: String; Value: Cardinal): boolean;
begin
  Result := RegSetValue(RootKey, Name, REG_DWORD, @Value, SizeOf(Cardinal));
end;

function RegSetBinary(RootKey: HKEY; Name: String; Value: Array of Byte): boolean;
begin
  Result := RegSetValue(RootKey, Name, REG_BINARY, @Value[Low(Value)], length(Value));
end;

function RegGetString(RootKey: HKEY; Name: String; Var Value: String): boolean;
var
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  if RegGetValue(RootKey, Name, REG_SZ, Buf, BufSize) then
  begin
    Dec(BufSize);
    SetLength(Value, BufSize);
    if BufSize > 0 then
      CopyMemory(@Value[1], Buf, BufSize);
    FreeMem(Buf);
    Result := True;
  end;
end;

function RegGetMultiString(RootKey: HKEY; Name: String; Var Value: String): boolean;
var
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  if RegGetValue(RootKey, Name, REG_MULTI_SZ, Buf, BufSize) then
  begin
    Dec(BufSize);
    SetLength(Value, BufSize);
    if BufSize > 0 then
      CopyMemory(@Value[1], Buf, BufSize);
    FreeMem(Buf);
    Result := True;
  end;
end;

function RegGetExpandString(RootKey: HKEY; Name: String; Var Value: String): boolean;
var
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  if RegGetValue(RootKey, Name, REG_EXPAND_SZ, Buf, BufSize) then
  begin
    Dec(BufSize);
    SetLength(Value, BufSize);
    if BufSize > 0 then
      CopyMemory(@Value[1], Buf, BufSize);
    FreeMem(Buf);
    Result := True;
  end;
end;

function RegGetDWORD(RootKey: HKEY; Name: String; Var Value: Cardinal): boolean;
var
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  if RegGetValue(RootKey, Name, REG_DWORD, Buf, BufSize) then
  begin
    CopyMemory(@Value, Buf, BufSize);
    FreeMem(Buf);
    Result := True;
  end;
end;

function RegGetBinary(RootKey: HKEY; Name: String; Var Value: String): boolean;
var
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  if RegGetValue(RootKey, Name, REG_BINARY, Buf, BufSize) then
  begin
    SetLength(Value, BufSize);
    CopyMemory(@Value[1], Buf, BufSize);
    FreeMem(Buf);
    Result := True;
  end;
end;

function RegValueExists(RootKey: HKEY; Name: String): boolean;
var
  SubKey: String;
  n: integer;
  hTemp: HKEY;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_READ, hTemp) = ERROR_SUCCESS then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      Result := (RegQueryValueEx(hTemp, PChar(SubKey), nil, nil, nil, nil) = ERROR_SUCCESS);
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegGetValueType(RootKey: HKEY; Name: String; var Value: Cardinal): boolean;
var
  SubKey: String;
  n: integer;
  hTemp: HKEY;
  ValType: Cardinal;
begin
  Result := False;
  Value := REG_NONE;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if (RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_READ, hTemp) = ERROR_SUCCESS) then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      Result := (RegQueryValueEx(hTemp, PChar(SubKey), nil, @ValType, nil, nil) = ERROR_SUCCESS);
      if Result then
        Value := ValType;
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegKeyExists(RootKey: HKEY; Name: String): boolean;
var
  SubKey: String;
  n: integer;
  hTemp: HKEY;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_READ, hTemp) = ERROR_SUCCESS then
    begin
      Result := True;
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegDelValue(RootKey: HKEY; Name: String): boolean;
var
  SubKey: String;
  n: integer;
  hTemp: HKEY;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_WRITE, hTemp) = ERROR_SUCCESS then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      Result := (RegDeleteValue(hTemp, PChar(SubKey)) = ERROR_SUCCESS);
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegDelKey(RootKey: HKEY; Name: String): boolean;
var
  SubKey: String;
  n: integer;
  hTemp: HKEY;
begin
  Result := False;
  n := LastPos('\', Name);
  if n > 0 then
  begin
    SubKey := Copy(Name, 1, n - 1);
    if RegOpenKeyEx(RootKey, PChar(SubKey), 0, KEY_WRITE, hTemp) = ERROR_SUCCESS then
    begin
      SubKey := Copy(Name, n + 1, Length(Name) - n);
      Result := (RegDeleteKey(hTemp, PChar(SubKey)) = ERROR_SUCCESS);
      RegCloseKey(hTemp);
    end;
  end;
end;

function RegEnum(RootKey: HKEY; Name: String; var ResultList: String; const DoKeys: Boolean): boolean;
var
  i: integer;
  iRes: integer;
  s: String;
  hTemp: HKEY;
  Buf: Pointer;
  BufSize: Cardinal;
begin
  Result := False;
  ResultList := '';
  if RegOpenKeyEx(RootKey, PChar(Name), 0, KEY_READ, hTemp) = ERROR_SUCCESS then
  begin
    Result := True;
    BufSize := 1024;
    GetMem(buf, BufSize);
    i := 0;
    iRes := ERROR_SUCCESS;
    while iRes = ERROR_SUCCESS do
    begin
      BufSize := 1024;
      if DoKeys then
        iRes := RegEnumKeyEx(hTemp, i, buf, BufSize, nil, nil, nil, nil)
      else
        iRes := RegEnumValue(hTemp, i, buf, BufSize, nil, nil, nil, nil);
      if iRes = ERROR_SUCCESS then
      begin
        SetLength(s, BufSize);
        CopyMemory(@s[1], buf, BufSize);
        if ResultList = '' then
          ResultList := s
        else
          ResultList := Concat(ResultList, #13#10, s);
        inc(i);
      end;
    end;
    FreeMem(buf);
    RegCloseKey(hTemp);
  end;
end;

function RegEnumValues(RootKey: HKEY; Name: String; var ValueList: String): boolean;
begin
  Result := RegEnum(RootKey, Name, ValueList, False);
end;

function RegEnumKeys(RootKey: HKEY; Name: String; var KeyList: String): boolean;
begin
  Result := RegEnum(RootKey, Name, KeyList, True);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
    ba1, ba2: array of byte;
    n: integer;
    s: String;
    d: Cardinal;
  begin
    setlength(ba1, 10);
    for n := 0 to 9 do ba1[n] := byte(n);

    RegSetString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestString', 'TestMe');
    RegSetExpandString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestExpandString',
      '%SystemRoot%\Test');
    RegSetMultiString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestMultiString',
      'String1'#0'String2'#0'String3');
    RegSetDword(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestDword', 7);
    RegSetBinary(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestBinary', ba1);

    RegGetString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestString', s);
    RegGetMultiString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestMultiString', s);
    RegGetExpandString(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestExpandString', s);
    RegGetDWORD(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestDword', d);
    RegGetBinary(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestBinary', s);
    SetLength(ba2, Length(s));

    for n := 1 to Length(s) do
    ba2[n-1] := byte(s[n]);
    Button1.Caption := IntToStr(Length(ba2));

    if RegKeyExists(HKEY_CURRENT_USER, 'Software\My Company\Test\foo') then
      if RegValueExists(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestBinary') then
        MessageBox(GetActiveWindow, 'OK', 'OK', MB_OK);
    RegDelValue(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar\TestString');
    RegDelKey(HKEY_CURRENT_USER, 'Software\My Company\Test\foo\bar');
    RegDelKey(HKEY_CURRENT_USER, 'Software\My Company\Test\foo');
    RegDelKey(HKEY_CURRENT_USER, 'Software\My Company\Test');
    RegDelKey(HKEY_CURRENT_USER, 'Software\My Company');

    if RegEnumKeys(HKEY_CURRENT_USER, 'Software\My Company', s) then
      Memo1.Text := s;

    if RegEnumValues(HKEY_CURRENT_USER, 'Software\My Company', s) then
      Memo1.Text := s;
    {
    if RegConnect('\\server1', HKEY_LOCAL_MACHINE, RemoteKey) then
    begin
      RegGetString(RemoteKey, 'Software\My Company\Test\foo\bar\TestString', s);
      RegDisconnect(RemoteKey);
    end;
    }
end;