生成系统环境变量

 ALIBPath, AINCPath: string);
resourcestring
  REG_C51_LIB = 'C51LIB';
  REG_C51_INC = 'C51INC';
  REG_PATH = 'PATH';
  REG_MACHINE_LOCATION = 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment';
  REG_USER_LOCATION = 'Environment';
var
  FPath: string;
  
function DataExits(const ASources, AData: string): Boolean;
var
  FList: TStrings;
  i: Integer;
begin
  Result := False;
  FList := Split(ASources, ';');
  for i := 0 to FList.Count - 1 do
  begin
    if FList[i] = AData then Result := True;
  end;
end;
begin
  with TRegistry.Create do
  begin
    try
      RootKey := HKEY_LOCAL_MACHINE;
      OpenKey(REG_MACHINE_LOCATION, True);

      FPath := ReadString(REG_PATH);

      if not DataExits(FPath, ALIBPath)then
      begin
        FPath := ReadString(REG_PATH) + ALIBPath + ';';

        WriteString(REG_PATH, FPath);
        SetEnvironmentVariable(PChar(REG_C51_LIB), PChar(ALIBPath));
//        SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, Integer(PChar('Environment')));
      end;

      FPath := ReadString(REG_PATH);
      if not DataExits(FPath, AINCPath)then
      begin
        FPath := ReadString(REG_PATH) + AINCPath + ';';

        WriteString(REG_PATH, FPath);
        SetEnvironmentVariable(PChar(REG_C51_LIB), PChar(ALIBPath));
//        SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, Integer(PChar('Environment')));
      end;
      SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, Integer(PChar('Environment')));
    finally
      Free;
    end;
  end;
end;