Scanning wifi getting the power

I know this is an asked question, but I coudn't get an answer..开发者_如何学运维. I want to scan the wifi stations around me, getting the power of them. It is not for upload it to the appstore, so I don't care about private things.

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Apple iOS SDK does not contain interface to get the signal strength information of Wi-Fi OFFICIALLY.

Here is a related SO question: Accessing iPhone WiFi Information via SDK