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샘플 코드

void DisableSinglenullMode(){
    CWinApp* pWinApp = acedGetAcadWinApp();
    if(!pWinApp) return;
    

    CComPtr<IDispatch> pDisp = pWinApp->GetIDispatch(TRUE);
    if(!pDisp) return;
       

    CComPtr<IAcadApplication> pComApp;
    HRESULT hr = pDisp->QueryInterface(IID_IAcadApplication,(void**)&pComApp);
    if(FAILED(hr)) return;
   

    CComPtr<IAcadPreferences> pPreferences;
    pComApp->get_Preferences(&pPreferences);
    CComPtr<IAcadPreferencesSystem> pPreferSystem;
    pPreferences->get_System(&pPreferSystem);
        
    _variant_t b(VARIANT_FALSE);
    pPreferSystem->put_SinglenullMode(b);
}