Returning a value from a method in an ActiveX control

[id(1)] void GetVersion();

BEGIN_DISPATCH_MAP(CDetectorCtrl, COleControl)
    DISP_FUNCTION_ID(CDetectorCtrl, "GetVersion", 1, GetVersion, VT_EMPTY, VTS_NONE)
END_DISPATCH_MAP()

void CDetectorCtrl::GetVersion()
{
    MessageBox(L"Test");
}

[id(1)] int GetVersion();

BEGIN_DISPATCH_MAP(CDetectorCtrl, COleControl)
    DISP_FUNCTION_ID(CDetectorCtrl, "GetVersion", 1, GetVersion, VT_INT, VTS_NONE)
END_DISPATCH_MAP()

int CDetectorCtrl::GetVersion()
{
    MessageBox(L"Test");
    return 1337;
}

LONG CDetectorCtrl::GetVersion(void)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState());
    return 1337;
}