In member function 'void Bluetooth::initialize()': error: cannot convert 'const char*' to 'const WCHAR*' for argument '1' to 'void* CreateFileW(const WCHAR*, DWORD, DWORD, _SECURITY_ATTRIBUTES*, DWORD, DWORD, void*)'
use CreateFileA

or ready-made libraries:
QSerialDevice -> http://fireforge.net/snapshots.php?group_id=199
or
QExtSerialPort -> http://code.google.com/p/qextserialport/