變更元件的系結

網路設定子系統一律會通知物件有關系結變更，而變更會影響通知物件的網路元件。 子系統會呼叫 notify 物件的 INetCfgComponentNotifyBinding：：NotifyBindingPath 方法，並傳遞值來指定變更以及變更相關系結路徑之 INetCfgBindingPath 介面的指標。 如果子系統傳遞NCN_DISABLE以停用通知物件的網路元件與特定網路卡共用的系結路徑，則 notify 物件可以啟動與其他網路卡的系結，如下列程式碼所示。

HRESULT CSample::NotifyBindingPath(DWORD dwChangeFlag,
        INetCfgBindingPath* pncbp1)
{
    INetCfgComponent *pnccLow;
    INetCfgComponentBindings *pncbind;
    IEnumNetCfgBindingPath *penumncbp;
    INetCfgBindingPath *pncbp2;
    IEnumNetCfgBindingInterface *penumncbi;
    INetCfgBindingInterface *pncbi;
    DWORD dwFlags = EBP_BELOW;
    ULONG celt = 1; // Request one enumeration element. 
    HRESULT hr = S_OK;
    // Retrieve bindings for the notify object's component (m_pncc)
    hr = m_pncc->QueryInterface(IID_INetCfgComponentBindings, 
                                (LPVOID*)&pncbind);
    // Determine if notification is about disabling a binding path.
    if (SUCCEEDED(hr) && (NCN_DISABLE & dwChangeFlag)) {
        // Retrieve enumerator for binding paths for the component.
        hr = pncbind->EnumBindingPaths(dwFlags, &penumncbp);
        // Reset the sequence and retrieve a binding path.
        hr = penumncbp->Reset();
        hr = penumncbp->Next(celt, &pncbp2, NULL);
        // Ensure the binding path is different.
        do {
            if (pncbp1 != pncbp2) break;
   hr = penumncbp->Skip(celt); // skip one element
            hr = penumncbp->Next(celt, &pncbp2, NULL);
        } while (SUCCEEDED(hr));
        if (SUCCEEDED(hr)) {
            // Retrieve enumerator for interfaces of the binding path.
            hr = pncbp2->EnumBindingInterfaces(&penumncbi);
            // Retrieve a binding interface for the binding path.
            hr = penumncbi->Next(celt, &pncbi, NULL);
            // Retrieve the lower network component.
            hr = pncbi->GetLowerComponent(&pnccLow);
            // If the component is a physical network card and binding 
            // is currently disabled, enable binding.
            DWORD dwcc;
            hr = pnccLow->GetCharacteristics(&dwcc);
            if (SUCCEEDED(hr) && (dwcc & NCF_PHYSICAL)) {
                hr = pncbp2->IsEnabled(); // S_FALSE for disabled
                if (hr == S_FALSE)  hr = pncbp2->Enable(TRUE);
            }
        }
        else return hr;
    }
    return hr;
}