Work with bluetooth
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http://www.bluez.org/ for Linux
http://inthehand.com/content/32feet.aspx for Windows
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You can try the following if targeting for Windows which is in Qt C++: https://projects.forum.nokia.com/qbluetooth
Mind that it's not the official QBluetooth from the Qt SDK.
The only problem is that it doesn't support the Microsoft Bluetooth Stack but only Bluesoleil. So if you want to use it you need to have Bluesoleil installed (https://projects.forum.nokia.com/qbluetooth/wiki#Otherusefulinformation)