...get the name of the current visual style, the color scheme name and size name (XP)?

uses ComObj, SyncObjs;

var
  GetCurrentThemeName: function (pszThemeFileName: LPWSTR; cchMaxNameChars: Integer;
    pszColorBuff: LPWSTR; cchMaxColorChars: Integer; pszSizeBuff: LPWSTR;
    cchMaxSizeChars: Integer): HRESULT; stdcall;

procedure TForm1.Button1Click(Sender: TObject);
var
  FileName, ColorScheme, SizeName: WideString;
  hThemeLib: THandle;
begin
  try
    hThemeLib := LoadLibrary('uxtheme.dll');
    if hThemeLib > 0 then
      GetCurrentThemeName := GetProcAddress(hThemeLib, 'GetCurrentThemeName');
    if Assigned(GetCurrentThemeName) then
    begin
      SetLength(FileName, 255);
      SetLength(ColorScheme, 255);
      SetLength(SizeName, 255);
      OleCheck(GetCurrentThemeName(PWideChar(FileName), 255,
        PWideChar(ColorScheme), 255, PWideChar(SizeName), 255));
      // show the the theme path and file name.
      ShowMessage(PWideChar(FileName));
      // show the color scheme name
      ShowMessage(PWideChar(ColorScheme));
      // show the size name
      ShowMessage(PWideChar(SizeName));
    end;
  finally
    FreeLibrary(hThemeLib);
  end;
end;

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