我正在使用此代码保存屏幕截图
Size size = Director::getInstance()->getWinSize();
auto renderTexture = RenderTexture::create((size.width/5)*3.98, (size.height/5)*3.45, Texture2D::PixelFormat::RGBA8888);
renderTexture->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);
Director::getInstance()->getRunningScene()->visit();
renderTexture->end();
renderTexture->saveToFile("screenshot.png" , kCCImageFormatPNG);
如何使用当前系统时间作为“截图”+当前时间+“.png”之类的文件名保存图像文件?