e10s - 我想從nsIObserver-nsIHttpChannel-nsIDOMWindow-nsIDOMDocument獲取。我該怎麼做？

Question

我的插件工作在FF41上。現在我想在e10s上遷移。使用Firefox開發者版v43。

示例觀察者（C++）。

NS_IMETHODIMP CFFObserver::Observe(nsISupports* aSubject, const char* aTopic, const char16_t* aData) 
{ ......... 
    if (lstrcmpA(aTopic, "http-on-modify-request") == 0) 
    { 
     CFFObserver::onSending(aSubject); 
    } ..........  
} 
void CFFObserver::onSending(nsISupports* IHttpChannel) 
{ 
.............. 
    nsISupports* IDOMWindowOwner = m_gate.Channel_GetOwnerWindow(IHttpChannel); 
................. 
} 

的例子JS幫手。

Channel_GetOwnerWindow：

function(objChannel) // This option does not worked in v43[e10s]; <br> 
{ 
    try 
    { 
     var notificationCallbacks = objChannel.QueryInterface(Components.interfaces.nsIHttpChannel).notificationCallbacks; 
     if (!notificationCallbacks) 
     { 
      var loadGroup = objChannel.QueryInterface(Components.interfaces.nsIRequest).loadGroup.notificationCallbacks; 
      if (loadGroup) notificationCallbacks = loadGroup.notificationCallbacks; 
     } 
     if (notificationCallbacks) 
     { 
      return notificationCallbacks.QueryInterface(Components.interfaces.nsIInterfaceRequestor) 
                    .getInterface(Components.interfaces.nsIDOMWindow) 
                    .QueryInterface(Components.interfaces.nsISupports); 
     } 
    } 
    catch (err) 
    { 
     this.ErrorOut(err); 
    } 
    return null; 
} 

下面的代碼工作，但我無法從獲得nsIDOMWindow獲取文檔。

...... 
objWindow.QueryInterface(Components.interfaces.nsIDOMWindow).document.QueryInterface(Components.interfaces.nsISupports) 

是錯誤 - 沒有任何接口....


Channel_GetOwnerWindow：

function(objChannel) 
{ 
    try 
    { 
     return objChannel.QueryInterface(Components.interfaces.nsIHttpChannel) 
              .notificationCallbacks 
              .getInterface(Components.interfaces.nsILoadContext) 
              .topFrameElement 
              .QueryInterface(Components.interfaces.nsISupports); 
    } 
    catch (err) 
    { 
     this.ErrorOut(err); 
    } 
    return null; 
} 

請幫助我解決這個問題。謝謝。

Answer 1

已解決！

var browser = objChannel.QueryInterface(Components.interfaces.nsIHttpChannel) 
    .notificationCallbacks 
    .getInterface(Components.interfaces.nsILoadContext).topFrameElement; 

var window = browser.contentWindow.QueryInterface(Components.interfaces.nsISupports);