cocos2d-x 下载图片

void HelloWorld::downloadPicture()
{
    HttpRequest *request = new HttpRequest();
    request->setRequestType(HttpRequest::Type::GET);
    request->setTag("downLoad tag 1");
    request->setUrl("http://ss.bdimg.com/static/superman/img/logo/bd_logo1_31bdc765.png");
    request->setResponseCallback(CC_CALLBACK_2(HelloWorld::onDownloadComplete, this));
    HttpClient::getInstance()->sendImmediate(request);
    request->release();
}

void HelloWorld::onDownloadComplete(HttpClient *sender, HttpResponse *response)
{
    if (response != nullptr)
    {
        if (response->isSucceed())
        {
            std::string fileName = FileUtils::getInstance()->getWritablePath() + std::string("baidu_logo.png");
            std::vector<char>* data = response->getResponseData();
            std::string buffer(data->begin(),data->end());

            FILE* fp = fopen(fileName.c_str(), "wb");
            fwrite(buffer.c_str(), 1, buffer.size(), fp);
            fclose(fp);

            // 加载图片资源
            Image* image = new Image();
            image->initWithImageFile(fileName);
            if (image != nullptr)
            {
                Texture2D* texture = new cocos2d::Texture2D();
                bool isImage = texture->initWithImage(image);
                if (isImage)
                {
                    Sprite* downloadSp = Sprite::createWithTexture(texture);
                    const Size& size = Director::getInstance()->getWinSize();
                    downloadSp->setPosition(size.width * 0.5f, size.height * 0.5f);
                    addChild(downloadSp);
                }
                image->release();
                texture->release();
            }
        }
        else
        {
            CCLOG("error %s",response->getErrorBuffer());
        }
    }
}