Fetching list of photos from Flickr and Picasa
In the previous chapter, we built the libcurl library. As a refresher on how to download a web page, refer to the 1_CurlDownloader example in the accompanying materials for this chapter.
The information about using Picasa and Flickr in C++ is somewhat limited, but calling the REST (Representational State Transfer) APIs of these sites is no different from downloading web pages. All we have to do is form a correct URL for the images list, download an XML file from this URL, and then parse this file to build a list of individual image URLs. Usually, REST APIs require some form of authentication using oAuth, but for the read-only access, it is sufficient to use only the application key, which is available through the simple online registration.
Note
The example code in this recipe only forms the URLs and it is up to the reader to download the actual image list. We also do not provide an application key here, and we encourage the reader to obtain a...
