It is impossible to get around the code.
In case the network uses WEP, it might be possible to crack the password, as the encryption is not secure. However, if WPA/WPA2 is used, then Bruteforce is the only way to find out the password remotely. But I can assure you that no device you own has enough processing power to guess a WPA password in a reasonable timeframe.
There are alternative methods, but the only realistic solution is to capture some traffic, compile a brute force script and then run it on a cloud service, such as Amazon. Around 2 month ago, someone posted about doing just this and was able to guess the password in ~20minutes.
Bottom-line is, if you don't have access to a device which is already connected to the wireless network, obtaining the key is complicated, will cost money and is most likely illegal.
That said, if you have access to a windows pc/laptop connected to the wireless network, you could run WirelessKeyView, it shows all wifi passwords stored by Windows.