IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表
CComPtr<IHTMLElement> body;
CComPtr<IDispatch> spDispCollection;
body->get_all(&spDispCollection);所以要获取iframe/frame(frameset) 里面的节点列表的话, 则需要根据body/doc 找到frames, 然后从frames -> IHTMLWindow2 -> IHTMLDocument2 . 主要有2个方法, 下面是代码片段
方法一:
IHTMLDocument2 *pDoc = 浏览器的Document(IWebBrowser2->IDispatch->IHTMLDocument2);
IHTMLWindow2 *pHTMLWnd = NULL;
IHTMLDocument2 *pFrameDoc=NULL;
IHTMLFramesCollection2 *pFramesCollection=NULL;
LPDISPATCH lpDispatch;
long p;
VARIANT varindex,varresult;
varresult.vt=VT_DISPATCH;
varindex.vt = VT_I4;
if(pDoc!=NULL)
{
HRESULT hr=pDoc->get_frames(&pFramesCollection);
if(SUCCEEDED(hr)&&pFramesCollection!=NULL)
{
hr=pFramesCollection->get_length(&p);
if(SUCCEEDED(hr))
for(int i=0; i<p; i++)
{
varindex.lVal = i;
if(pFramesCollection->item(&varindex, &varresult) ==S_OK)
{
lpDispatch=(LPDISPATCH)varresult.ppdispVal;
if (SUCCEEDED(lpDispatch->QueryInterface(IID_IHTMLWindow2, (LPVOID *)&pHTMLWnd)))
{
if(SUCCEEDED(pHTMLWnd->get_document( &pFrameDoc)))
{
//work with the pFrameDoc
}
pHTMLWnd->Release();
pHTMLWnd=NULL;
}
}
}
pFramesCollection->Release();
}
pDoc->Release();
}
方法二:
CComQIPtr<IHTMLElement> pElem = ; // 可以递归上面的 CComPtr<IDispatch> spDispCollection 来得到
CComBSTR bstrTagName;
pElem->get_tagName(&bstrTagName);
if ( lstrcmpiW(L"IFRAME", bstrTagName)==0 ||
lstrcmpiW(L"FRAME", bstrTagName)==0 )
{
CComQIPtr<IHTMLFrameBase2> _framebase2;
CComPtr<IHTMLWindow2> _framewindow;
CComPtr<IHTMLDocument2> _framedoc;
if( (_framebase2 = spItem)
&& SUCCEEDED( _framebase2->get_contentWindow(&_framewindow) ) && _framewindow!=NULL
&& SUCCEEDED( _framewindow->get_document(&_framedoc) ) && _framedoc!=NULL )
{
// 对 _framedoc 节点进行处理
}
}
iframe 跨域访问(cross frame) zz from : http://codecentrix./2007/10/when-ihtmlwindow2getdocument-returns.html
由于安全性限制, 为防止跨域脚本攻击, 当frames 跨域的时候, IHTMLWindow2::get_document 调用将返回 E_ACCESSDENIED .
下面函数 HtmlWindowToHtmlDocument 对于跨域的frame 通过 IHTMLWindow2 -> IID_IWebBrowserApp -> IHTMLWindow2 绕过了限制.
// Converts a IHTMLWindow2 object to a IHTMLDocument2. Returns NULL in case of failure.
// It takes into account accessing the DOM across frames loaded from different domains.
CComQIPtr<IHTMLDocument2> HtmlWindowToHtmlDocument(CComQIPtr<IHTMLWindow2> spWindow)
{
ATLASSERT(spWindow != NULL);
CComQIPtr<IHTMLDocument2> spDocument;
HRESULT hRes = spWindow->get_document(&spDocument);
if ((S_OK == hRes) && (spDocument != NULL))
{
// The html document was properly retrieved.
return spDocument;
}
// hRes could be E_ACCESSDENIED that means a security restriction that
// prevents scripting across frames that loads documents from different internet domains.
CComQIPtr<IWebBrowser2> spBrws = HtmlWindowToHtmlWebBrowser(spWindow);
if (spBrws == NULL)
{
return CComQIPtr<IHTMLDocument2>();
}
// Get the document object from the IWebBrowser2 object.
CComQIPtr<IDispatch> spDisp;
hRes = spBrws->get_Document(&spDisp);
spDocument = spDisp;
return spDocument;
}
// Converts a IHTMLWindow2 object to a IWebBrowser2. Returns NULL in case of failure.
CComQIPtr<IWebBrowser2> HtmlWindowToHtmlWebBrowser(CComQIPtr<IHTMLWindow2> spWindow)
{
ATLASSERT(spWindow != NULL);
CComQIPtr<IServiceProvider> spServiceProvider = spWindow;
if (spServiceProvider == NULL)
{
return CComQIPtr<IWebBrowser2>();
}
CComQIPtr<IWebBrowser2> spWebBrws;
HRESULT hRes = spServiceProvider->QueryService(IID_IWebBrowserApp, IID_IWebBrowser2, (void**)&spWebBrws);
if (hRes != S_OK)
{
return CComQIPtr<IWebBrowser2>();
}
return spWebBrws;
}
附:
IE(控件/接口)中主要有4个部分, Browser, Document, Frame/IFrame, Element , 其对应接口分别是
Browser - IWebBrowser2
Document - IHTMLDocument2
Frame/IFrame- IHTMLWindow2
Element - IHTMLElement
可以通过下面方法互相获取
browser -> document IWebBrowser2::get_Document
document -> frame IHTMLDocument2::get_parentWindow
frame -> document IHTMLWindow2::get_document
frame -> parent frame IHTMLWindow2::get_parent
frame -> children frames IHTMLWindow2::get_frames
element -> Frame IHTMLElement->QI(IHTMLFrameBase2) -> IHTMLFrameBase2->get_contentWindow -> IHTMLWindow2
