Suppose your QR code presents the following URL: http://server/script. This modified QR-code reader lets you automatically add Wi-Fi fingerprints (SSID name, MAC-address and RSSI info) for the each "visible" Wi-Fi network.
It is described in this article: D.Namiot "Network Proximity on Practice: Context-aware Applications and Wi-Fi Proximity", International Journal of Open Information Technologies Vol. 1, N. 3, 2013, pp. 1-4