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Graphics / sf::Texture::~Texture() Crashes App On Exit

« on: November 15, 2016, 02:05:49 pm »

Hello peeps,

I've been using SFML for quite some time now, and I have to say that I absolutely love it.

Currently I'm building a game engine + all sorts of tools for my future games, and I just threw together this little file downloader that can be used in combination with SFML resources' loadFromMemory() function.

It all works fine, the image is displayed correctly, but when I close the application, it crashes with an EXC_BAD_ACCESS error and shows me the assemly code for the destructor of the Texture and for some releasePool() method. I cannot seem to figure out why this is happening. It works without any problems with sf::Font and sf::SoundBuffer. Please help.

Download.cpp

(click to show/hide)

Download::Download(const URL& url) :
m_data(),
m_url(url),
m_size(0),
m_state(Stopped),
m_function([](bool, const std::string&) {}){
    fetchMetadata();
}

Download::~Download() {
    m_thread.join();
}

void Download::onComplete(std::function<void (bool success, const std::string&)> function) {
    m_function = function;
}

void Download::start() {
    m_state = Downloading;
   
    m_thread = std::thread(&Download::run, this);
}

int Download::getSize() const {
    return m_size;
}

Download::State Download::getState() const {
    return m_state;
}

bool Download::isComplete() const {
    return m_state == Complete;
}

void Download::fetchMetadata() {
    sf::Http http(m_url.getProtocol() + "://" + m_url.getHost());
    sf::Http::Request request(m_url.getPath(), sf::Http::Request::Head);
    sf::Http::Response response = http.sendRequest(request);

    if (response.getStatus() == sf::Http::Response::Ok) {
        m_size = std::stoi(response.getField("Content-Length"));
    }
}

void Download::run() {
    sf::Http http(m_url.getProtocol() + "://" + m_url.getHost());
    sf::Http::Request request(m_url.getPath(), sf::Http::Request::Get);
    sf::Http::Response response = http.sendRequest(request);
   
    bool success;
   
    if (response.getStatus() == sf::Http::Response::Ok) {
        m_state = Complete;
        m_data = response.getBody();
        success = true;
    } else {
        m_state = Error;
        success = false;
    }
   
    if (m_function) {
        m_function(success, m_data);
    }
}
 

main.cpp

(click to show/hide)

int main(int argc, const char * argv[]) {
    sf::Texture texture;
    sf::Sprite sprite;
   
    URL url("http://r.ddmcdn.com/s_f/o_1/cx_633/cy_0/cw_1725/ch_1725/w_720/APL/uploads/2014/11/too-cute-doggone-it-video-playlist.jpg");
    Download download(url);
   
    download.onComplete([&](bool success, const std::string& data) {
        texture.loadFromMemory(data.c_str(), data.length());
        sprite.setTexture(texture);
    });
   
    download.start();

    sf::RenderWindow window(sf::VideoMode::getDesktopMode(), "Downloading...");

    while (window.isOpen()) {
        sf::Event event;

        while (window.pollEvent(event)) {
            if (event.type == sf::Event::Closed) {
                window.close();
            }
        }

        window.clear(sf::Color(60, 60, 60));

        window.draw(sprite);

        window.display();
    }

    return 0;
}
 

If I replace sf::Texture and sf::Sprite with sf::Font and sf::Text respectively (and change the URL obviously), there is no problem at all.