delphi - 如何读取注册表项的默认值

我正在使用一个Delphi XE2项目来使用注册表项进行操作。所以我定义了以下代码：

procedure TMainForm.BitBtn01Click(Sender: TObject);
var
  RegistryEntry: TRegistry;
begin
  RegistryEntry := TRegistry.Create(KEY_READ or KEY_WOW64_64KEY);
  RegistryEntry.RootKey:= HKEY_LOCAL_MACHINE;
  if (not RegistryEntry.KeyExists('Software\MyCompanyName\MyName\')) then
    begin
      RegistryEntry.Access:= KEY_WRITE or KEY_WOW64_64KEY;
      RegistryEntry.OpenKey('Software\MyCompanyName\MyName\',True);
      RegistryEntry.WriteString('', 'MyFirstProject');
    end
  else
    begin
      Memo01.Lines.Add(RegistryEntry.ReadString('(Default)')); //Not Working
      Memo01.Lines.Add(RegistryEntry.ReadString('')); //Not Working
      Memo01.Lines.Add(RegistryEntry.ReadString('@')); //Not Working
    end;
  RegistryEntry.CloseKey();
  RegistryEntry.Free;
end;

我的要求是检查“ MyName”的默认值并显示在Memo01中。但是，没有任何事情在加速。所以我尝试了另一种方法，如下所示：

procedure TMainForm.BitBtn01Click(Sender: TObject);
var
  RegistryEntry: TRegistry;
  RegistryString: string;
begin
  RegistryEntry := TRegistry.Create(KEY_READ or KEY_WOW64_64KEY);
  RegistryEntry.RootKey:= HKEY_LOCAL_MACHINE;
  if (not RegistryEntry.KeyExists('Software\MyCompanyName\MyName\')) then
    begin
      RegistryEntry.Access:= KEY_WRITE or KEY_WOW64_64KEY;
      RegistryEntry.OpenKey('Software\MyCompanyName\MyName\',True);
      RegistryEntry.WriteString('', 'MyFirstProject');
    end
  else
    begin
      RegistryString := RegistryEntry.ReadString('(Default)'); //Not Working
      RegistryString := RegistryEntry.ReadString(''); //Not Working
      RegistryString := RegistryEntry.ReadString('@'); //Not Working
      Memo01.Lines.Add(RegistryString);
    end;
  RegistryEntry.CloseKey();
  RegistryEntry.Free;
end;

但这也不起作用。

最佳答案

您的else部分中没有Openkey。

Const
  C_KEY='Software\MyCompanyName\MyName\';
var
  RegistryEntry: TRegistry;
  RegistryString: string;
begin
  RegistryEntry := TRegistry.Create(KEY_READ or KEY_WOW64_64KEY);
  try
    RegistryEntry.RootKey := HKEY_LOCAL_MACHINE;
    if (not RegistryEntry.KeyExists(C_KEY)) then
    begin
      RegistryEntry.Access := KEY_WRITE or KEY_WOW64_64KEY;
      if RegistryEntry.OpenKey(C_KEY, true) then
        RegistryEntry.WriteString('', 'MyFirstProject');
    end
    else
    begin
      RegistryEntry.Access := KEY_READ or KEY_WOW64_64KEY;
      if RegistryEntry.OpenKey(C_KEY, false) then
      begin
        Memo01.Lines.Add(RegistryEntry.ReadString(''));
      end;
    end;
    RegistryEntry.CloseKey();
  finally
    RegistryEntry.Free;
  end;
end;