Question

我无法使用原生cocos2d-x功能下载图片。我正在使用HttpRequest尝试在Android上下载图片。当我在Java中使用URL，InputStream和OutputStream来下载图片。当我尝试使用原生cocos2d-x函数时，图片是有效的。图片有问题。有问题的Cocos2d-x版本是写作时的最新版本3.0。

Answer 1

在cocos2d-x中编写此代码

void HelloWorld::loadImage()
{
    log("onHttpRequestCompleted In the request");
    HttpRequest* request = new (std::nothrow) HttpRequest();
    request->setUrl("https://graph.facebook.com/100000706355105/picture?width=120&height=120");
    request->setRequestType(cocos2d::network::HttpRequest::Type::GET);
    request->setResponseCallback(CC_CALLBACK_2(HelloWorld::onRequestImgCompleted, this));
    request->setTag("Post test2");
    HttpClient::getInstance()->send(request);
    request->release();
}

在RequestCompleted上

void HelloWorld::onRequestImgCompleted(HttpClient *sender, HttpResponse *response)
{

    log("In HelloWorld");
    log("AppDelegate::onHttpRequestCompleted - onHttpRequestCompleted BEGIN");
    if (!response)
    {
        log("onHttpRequestCompleted - No Response");
        return;
    }

    log("onHttpRequestCompleted - Response code: %lu", response->getResponseCode());

    if (!response->isSucceed())
    {
        log("onHttpRequestCompleted - Response failed");
        log("onHttpRequestCompleted - Error buffer: %s", response->getErrorBuffer());
        return;
    }
    log("onHttpRequestCompleted - Response code: %s", response->getResponseDataString());

    std::vector<char> *buffer = response->getResponseData();
    const char* file_char = buffer->data();
    log("onHttpRequestCompleted - Response code: %s", file_char);
    Image * image = new  Image ();
    image-> initWithImageData ( reinterpret_cast<const unsigned char*>(&(buffer->front())), buffer->size());
    Texture2D * texture = new  Texture2D ();
    texture-> initWithImage (image);
    Sprite * sprite = Sprite :: createWithTexture (texture);
    sprite->setPosition(Vec2(visibleSize.width/2, visibleSize.height / 2));
    addChild(sprite);

    log("onHttpRequestCompleted height %f", sprite->getContentSize().height);

}

使用cocos2d-x下载图片

1 个答案: