Как работать с реестром, используя только WinAPI

Автор: i-s-v

unit apiregistry;

interface

uses Windows;

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;

implementation

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;

end.