Cocos2d-x中下载网络图片并缓存.
当前在游戏开发中，无论大型游戏还是休闲小游戏，都喜欢加入好友系统，那就涉及到获取好友头像的需求，那在Cocos2d-x中如果获取网络图片呢？
先封装一个下载图片的工具类，顺便做一下缓存吧，要不每次都下载多耗流量啊——
std::string GImageUtils::downloadImageWithUrl(const std::string &fullUrl, const ccHttpRequestCallback & callback)
{
// - - - - - - - - - - 图片缓存 - - - - - - - - - -
std::string filePath = __String::createWithFormat("%s", FileUtils::getInstance()->getWritablePath().c_str())->getCString();
std::vector<std::string> splitStr = GStringUtils::split(fullUrl.c_str(), "http://");
if (splitStr.size() > 1) {
filePath += GStringUtils::replace_all_distinct(splitStr.at(1), "/", "-") ;
FILE* fp = fopen(filePath.c_str(),"rb");
if (fp)
{
CCLOG("has file! filePath: %s", filePath.c_str());
return filePath;// 如果有缓存图片则直接返回路径
}
}
// - - - - - - - - - - 下载图片 - - - - - - - - - -
auto request = new HttpRequest();
// required fields
request->setRequestType(HttpRequest::Type::GET);
request->setUrl(fullUrl.c_str());
request->setResponseCallback(callback);
// optional fields
request->setTag("_Http_GetImage_");
HttpClient::getInstance()->send(request);
request->release();
return kImageNoCacheTag;// 没有缓存返回Tag区分情况处理
}
std::string GImageUtils::onGettedImage(HttpClient *sender, HttpResponse *response)
{
if (!response) {
return kImageDownloadErrorTag;
}
if (0 != strlen(response->getHttpRequest()->getTag())) {
CCLOG("HttpConnect: - %s Completed. -", response->getHttpRequest()->getTag());
}
long statusCode = response->getResponseCode();
char statusString[64] = {};
sprintf(statusString, "HttpConnect: HTTP Status Code: %ld, tag = %s.", statusCode, response->getHttpRequest()->getTag());
CCLOG("HttpConnect: response code: %ld", statusCode);
if (!response->isSucceed()) {
CCLOG("HttpConnect: response failed!!!...");
CCLOG("HttpConnect: error buffer: %s.", response->getErrorBuffer());
return kImageDownloadErrorTag;
}
// dump data
std::vector<char> *buffer = response->getResponseData();
if (strcmp(response->getHttpRequest()->getTag(), "_Http_GetImage_") != 0) {
return kImageDownloadErrorTag;
}
// - - - - - - - - - - 下载成功，生成图片 - - - - - - - - - -
auto img = new Image();
img->initWithImageData((unsigned char*)buffer->data(), buffer->size());
// - - - - - - - - - - 缓存图片 - - - - - - - - - -
std::string filePath = __String::createWithFormat("%s", FileUtils::getInstance()->getWritablePath().c_str())->getCString();
// 保存到本地文件，把图片网址作为文件名
std::string bufffff(buffer->begin(),buffer->end());
std::vector<std::string> splitStr = GStringUtils::split(response->getHttpRequest()->getUrl(), "http://");
if (splitStr.size() > 1) {
filePath += GStringUtils::replace_all_distinct(splitStr.at(1), "/", "-") ;
}
CCLOG("filePath: %s", filePath.c_str());
FILE *fp = fopen(filePath.c_str(), "wb+");
fwrite(bufffff.c_str(), 1, buffer->size(), fp);
fclose(fp);
img->release();
return filePath;// 返回图片路径
}