Cocos2d-x利用CCHttpRequest获取网络图片并显示

利用CCHttpRequest获取网上http地址的图片并缓存到本地生成CCSprite用于显示

//图片结构
class imgstruct : public CCObject

{

public:

    imgstruct(const char* iName, const char* idStr, CCLayer* _layer, bool mask)

    {

        imageName = string(iName);

        observerId = string(idStr);

        layer = _layer;

        useMask = mask;

    }

    ~imgstruct()

    {

    }

    string          imageName;

    string          observerId;

    CCLayer*        layer; //父layer

    bool            useMask;

};


//图片监听，下载完成触发

class CCImageNotificationCenter : public CCNotificationCenter

{

public:

    DECLARE_SINGLETON_CLASS(CCImageNotificationCenter);

    CCImageNotificationCenter();

    ~CCImageNotificationCenter();

    CCString addObserver(const char *imageName,CCLayer* layer,bool useMask);

    void imageLoaded();

    void removeObserver(const char *name);

    void postNotification(const char *name, CCObject *object);

    void imageLoaded(CCObject *obj);

    static CCSprite* getSpriteFromWriteablePath(const char* name);

private:

    CCNotificationCenter        m_notificationCenter;

    int                         m_observerID;

};

具体实现

CCString CCImageNotificationCenter::addObserver(const char *imageName, CCLayer* layer, bool useMask)

{

    CCString* observerIDstr =  CCString::createWithFormat("%d",m_observerID);

    m_notificationCenter.addObserver(this, callfuncO_selector(CCImageNotificationCenter::imageLoaded), observerIDstr->getCString(), new imgstruct(imageName, observerIDstr->getCString(), layer, useMask));

    m_observerID++;

    return observerIDstr->getCString();

}

void CCImageNotificationCenter::removeObserver(const char *name)

{

    m_notificationCenter.removeObserver(this, name);

}

void CCImageNotificationCenter::postNotification(const char *name, CCObject *object)

{

    m_notificationCenter.postNotification(name, object);

}

void CCImageNotificationCenter::imageLoaded(CCObject *obj)

{

    imgstruct* img = (imgstruct*)obj;

    CCLOG("imageLoaded success,imageName:%s",img->imageName.c_str());

    CCSprite* sprite = CCImageNotificationCenter::getSpriteFromWriteablePath(img->imageName.c_str());

    CCLOG("got sprite 0x%X", sprite);

    if (img->useMask)

    {

        img->layer->addChild(CCImageNotificationCenter::createMaskedSprite(sprite,"mask.png"));

    }

    else

    {

        float scale_ = (float) img->layer->getContentSize().width  / (float)sprite->getContentSize().width;

        sprite->setAnchorPoint(ccp(,));

        sprite->setScale( scale_ );

        img->layer->addChild(sprite);

    }

    this->removeObserver(img->observerId.c_str());

    img->release();

}

CCSprite* CCImageNotificationCenter::getSpriteFromWriteablePath(const char* name)

{

    std::string path = CCFileUtils::sharedFileUtils()->getWriteablePath();

    path += name;

    FILE* fp = fopen(path.c_str(),"rb");

    if (!fp)

    {

        return NULL;

    }

    fseek(fp,,SEEK_END);

    int len = ftell(fp);

    fseek(fp,,SEEK_SET);

    char* buf = (char*)malloc(len);

    fread(buf,len,,fp);

    fclose(fp);

    CCImage* img = new CCImage;

    img->initWithImageData(buf,len);

    free(buf);

    cocos2d::CCTexture2D* texture = new cocos2d::CCTexture2D();

    bool isImg = texture->initWithImage(img);

    img->release();

    if (!isImg)

    {

        delete texture;

        return CCSprite::create("default.png");//加载资源并非图片时返回的默认图

    }

    CCSprite* sprite = CCSprite::createWithTexture(texture);

    texture->release();

    return sprite;

}

实现ImageDownload类

class ImageDownloader : public cocos2d::CCObject

{

    DECLARE_SINGLETON_CLASS(ImageDownloader);

public:

    ImageDownloader();

    ~ImageDownloader();

    void CreateLuaFunc();

    void SendHttpRequest(const char* url, CCLayer* layer, const char* filename);

    void HttpRequestComplete(CCHttpClient *sender, CCHttpResponse *response);

    CCString    observerID;

    CCLayer*    container;

    bool        useMask;

};

void ImageDownloader::SendHttpRequest(const char* url, CCLayer* layer, const char* filename)

{

    CCHttpRequest* request = new CCHttpRequest();

    this->container = layer;

    if (this->container)

    {

        CCImageNotificationCenter::CreateInstance();

        this->observerID = CCImageNotificationCenter::GetInstance()->addObserver(filename,container,useMask);

    }

    request->setUrl(url);

//    request->setUrl("http://neoimaging.beareyes.com.cn/png2/ni_png_2_1518.png");

    request->setRequestType(CCHttpRequest::kHttpGet);

    request->setResponseCallback(this, httpresponse_selector(ImageDownloader::HttpRequestComplete));

    request->setTag("GET IMAGE");

    CCHttpClient::getInstance()->send(request);

    request->release();

}

void ImageDownloader::HttpRequestComplete(CCHttpClient *sender, CCHttpResponse *response)

{

    if (!response)

    {

        return;

    }

    // You can get original request type from: response->request->reqType

    if ( != strlen(response->getHttpRequest()->getTag()))

    {

        CCLog("%s completed", response->getHttpRequest()->getTag());

    }

    int statusCode = response->getResponseCode();

    char statusString[] = {};

    sprintf(statusString, "HTTP Status Code: %d, tag = %s", statusCode, response->getHttpRequest()->getTag());

    CCLog("response code: %d", statusCode);

    if (!response->isSucceed())

    {

        CCLog("response failed");

        CCLog("error buffer: %s", response->getErrorBuffer());

        return;

    }

    // dump data

    std::vector<char> *buffer = response->getResponseData();

    std::string path = CCFileUtils::sharedFileUtils()->getWriteablePath();

    std::string bufffff(buffer->begin(),buffer->end());

    //保存到本地文件

    path += "dl.png";

    CCLOG("path: %s",path.c_str());

    FILE *fp = fopen(path.c_str(), "wb+");

    fwrite(bufffff.c_str(), ,buffer->size(), fp);

    fclose(fp);

    //传入container的下载请求会添加侦听，待下载完毕自动添加到container上

    if (this->container)

    {

        // container 是一个CCLayer ，用来显示动态加载的资源

        CCImageNotificationCenter::GetInstance()->cocos2d::CCNotificationCenter::postNotification(this->observerID.getCString());

    }

}