How to read Default Value of Registry Key

Question

I am having one Delphi XE2 project to work something with registry key. So I have defined the following codes : ``` 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; ``` My requirement is to check the Default Value of "MyName" and to show in Memo01. But nothing is heppening. So I have tried another way as follows : ``` procedure TMainForm.Bit…

Accepted Answer

There is no Openkey in your else part.

```
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;
```

How to read Default Value of Registry Key

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