Why ctypes always returns True?

My c code is:
    extern "C" __declspec(dllexport) bool isTrue( bool b){ return b; }

py code is:
    lib=ctypes.cdll.LoadLibrary('xx.dll') #dll generated from the c code above

    b=lib.isTrue(False) 
    print c_bool(b).value


no matter i call lib.isTrue() with True or False, the output is always 'True'.....
could someone explain?










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