c++ - 如何访问 body using c++/ATL/COM?</a></h1> <div class="ml12 aside-cta flex--item print:d-none sm:ml0 sm:mb12 sm:order-first sm:as-end"> <a href="https://stackoverflow.com/questions/ask" target="_blank" class="ws-nowrap s-btn s-btnprimary">问问题</a></div> </div> <div class="d-flex fw-wrap pb8 mb16 bb bc-black-075"> <div class="flex--item ws-nowrap mr16 mb8"> <span class="fc-light mr2"></span> </div> <div class="flex--item ws-nowrap mr16 mb8" title="2022-04-17 15:46:40Z"> <span class="fc-light mr2">问问题</span> <time itemprop="dateCreated" datetime="2010-07-19T15:41:53.210">2010-07-19T15:41:53.210</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 3334 次 </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question" data-questionid="4" data-position-on-page="0" data-score="763" id="question"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="4"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-peeufs8c"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button> <div id="--stacks-s-tooltip-peeufs8c" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question shows research effort; it is useful and clear<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value=""> 0 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-04106eqn"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button><div id="--stacks-s-tooltip-04106eqn" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question does not show any research effort; it is unclear or not useful<div class="s-popover--arrow"></div></div> <div id="--stacks-s-tooltip-tgvwendx" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Bookmark this question.<div class="s-popover--arrow"></div></div> <a class="js-post-issue flex--item s-btn s-btnunset c-pointer py6 mx-auto" data-shortcut="T" data-ks-title="timeline" data-controller="s-tooltip" data-s-tooltip-placement="right" aria-label="Timeline" aria-describedby="--stacks-s-tooltip-abwmy15k"><svg aria-hidden="true" class="mln2 mr0 svg-icon iconHistory" width="19" height="18" viewBox="0 0 19 18"><path d="M3 9a8 8 0 1 1 3.73 6.77L8.2 14.3A6 6 0 1 0 5 9l3.01-.01-4 4-4-4h3L3 9Zm7-4h1.01L11 9.36l3.22 2.1-.6.93L10 10V5Z"></path></svg></a><div id="--stacks-s-tooltip-abwmy15k" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Show activity on this post.<div class="s-popover--arrow"></div></div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>I have written a browser helper object to get the text between the tags and use it for data mining purpose. I tried using it on <code>igoogle</code> (basically to test its capability on gadgets) and it failed in some of the cases where an <code><iframe></code> is present with some external source. </p>

<p>I can get the <code><div></code> and its child <code><iframe></code> but fail to get the body.</p>

<p>I get the frame collection from this API <code>HRESULT IHTMLDocument2::get_frames(IHTMLFramesCollection2 p);</code></p>

<p>The problem can be re-created in igoogle and firefox using the <code>loan calculator</code> gadget. You will also need the fire bug extension to debug the page. For reference purpose I am pasting the sample here...</p>

<pre><code><div class="modboxin" id="m_8_b"><div style="border: 0pt none; padding: 0pt; margin: 0pt; width: 100%;" id="remote_8">
<iframe scrolling="no" frameborder="0" onload="_ifr_ol(this)" style="border: 0pt none; padding: 0pt; margin: 0pt; width: 100%; height: 100px; overflow: hidden;" name="remote_iframe_8" id="remote_iframe_8" src="http://8.ig.gmodules.com/gadgets/ifr?exp_rpc_js=1&amp;exp_track_js=1&amp;v=682f3db70d7cfff515d7c64fd24923&amp;container=ig&amp;view=default&amp;debug=0&amp;mid=8&amp;lang=en&amp;url=http%3A%2F%2Fwww.nova.edu%2F%7Ewillheat%2Floan.xml&amp;country=US&amp;parent=http://www.google.com&amp;libs=core:core.io:core.iglegacy:auth-refresh&amp;synd=ig&amp;view=default#st=...B27zWVKsnJu6OviCNnzXoPjkDsbPg95yZNMwfmMaLnwWoRxGaRArxTpOqK4TiH87uGUiHnYkkaqU9NE1sOyms6sg/Jwi&amp;gadgetId=116809661812082345195&amp;gadgetOwner=105250506097979753968&amp;gadgetViewer=105250506097979753968&amp;rpctoken=422312139&amp;ifpctok=422312139">
</iframe>
</div>
</code></pre>

<p>The link is not complete as I have replaced some part of the <code>src</code> with <code>...</code>. Now as you can see that there is no body for the although it is getting rendered in the browser..</p>

<p>As per this post ( <code>http://stackoverflow.com/questions/957133/does-body-onload-wait-for-iframes</code> ) the onload event on body does not wait for frames to complete.</p>

<p>So I can conclude that I have to use some sort <code>onload</code> listener for the <code><iframe></code>... but I am not sure how ...</p>

<p>Kindly suggest a way/snippet to retrieve the body of the <code><iframe></code> using ATL/COM APIs...</p>

<p> Update **</p>

<p>I am using the following code to get the <code><iframes></code>. Although i get the iframe collection but when i try to get their body it fails... may be because they are not loaded by that time ?!</p>

<pre><code>void testFrame(IHTMLDocument2* pDocument)
{
 CComQIPtr<IHTMLFramesCollection2> col;
 HRESULT hr = pDocument->get_frames(&col);
 if((hr == S_OK) && (col != NULL))
 {
 long counter = 0;
 hr = col->get_length(&counter);
 if((hr == S_OK) && (counter > 0))
 {
 for (int i = 0; i < counter; i++)
 {
 VARIANT v1, v2;
 v1.vt = VT_I4; v1.lVal = i;
 VariantClear (&v2);
 hr = col->item(&v1, &v2);

 if (hr == S_OK && (v2.vt == VT_DISPATCH))
 {
 CComPtr<IDispatch> pDispatch = v2.pdispVal;
 CComQIPtr<IHTMLWindow2, &IID_IHTMLWindow2> pFrame = pDispatch;

 if(pFrame)
 {
 CComPtr<IHTMLDocument2> spHTML;
 hr = pFrame->get_document (&spHTML);

 if((hr == S_OK) && (spHTML != NULL))
 {
 CComQIPtr<IHTMLElement> elem;
 hr = spHTML->get_body(&elem);
 if((hr == S_OK) && (elem != NULL))
 {
 CComBSTR str;
 hr = elem->get_innerHTML(&str);
 if((hr == S_OK) && (str != NULL))
 {
 box(str);
 }else if(hr != S_OK) {
 box(_T("hr is not ok"));
 }else if(str == NULL){
 box(_T("STR is null"));
 }else
 box(_T("Failed"));
 }
 }
 }
 }
 }
 }
 }
}
</code></pre>

<p>And,</p>

<pre><code>void box(LPCWSTR msg)
{
 MessageBox(NULL,msg,_T("..BOX.."),MB_OK);
}
</code></pre>

<p>Any suggestions, how to get the iframe body .... by the way I am handling this in <code>OnDocumentComplete</code> event...</p>

<p>Thanks,</p>
 </div> <div class="mt24 mb12"> <div class="post-taglist d-flex gs4 gsy fd-column"> <div class="d-flex ps-relative fw-wrap"> <a href="/tags/c++" class="post-tag js-gps-track" title="show questions tagged 'c++'" rel="tag">c++</a><a href="/tags/com" class="post-tag js-gps-track" title="show questions tagged 'com'" rel="tag">com</a><a href="/tags/iframe" class="post-tag js-gps-track" title="show questions tagged 'iframe'" rel="tag">iframe</a><a href="/tags/atl" class="post-tag js-gps-track" title="show questions tagged 'atl'" rel="tag">atl</a><a href="/tags/bho" class="post-tag js-gps-track" title="show questions tagged 'bho'" rel="tag">bho</a> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">4</span> </div> </div> <div class="js-zone-container zone-container-responsive"> <div id="dfp-isb" class="everyonelovesstackoverflow everyonelovesinline-sidebar mx-auto" style="min-height: auto; height: auto; display: none;"></div> <div class="js-report-ad-button-container mx-auto" style="width: 300px"></div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader d-flex ai-center mb8"> <div class="flex--item fl1"> <h2 class="mb0" data-answercount=""> 1 回答 <span style="display:none;" itemprop="answerCount">1</span> </h2> </div> </div> </div> <a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="0"> 0 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>Instead of updating my own question.. I am putting this as an answer. Though I would really love to see an alternate answer...</p>

<p><strong>--Solution--</strong></p>

<p>My basic assumptions are:</p>

<ol>
<li>I know about the urls to handle..</li>
<li>A page can be divided in two main events (there could be other events too but these two will do)

<ul>
<li>The completion of the main page</li>
<li>Completion of the <code><iframes></code></li>
</ul></li>
</ol>

<p><strong>Code</strong></p>

<pre><code>void STDMETHODCALLTYPE CSafeMaskBHO::OnDocumentComplete(IDispatch pDisp, VARIANT pvarURL)
{
 CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;

 CComBSTR url = NULL;
 HRESULT hr = spTempWebBrowser->get_LocationURL(&url); // You can also take the url from pvarURL .. 

 if((hr == S_OK) && (url != NULL))
 {
 /
 I know which url's I am looking for
 /
 if(!(wcsstr(url,_T("www.example.com")) != NULL) && !((wcsstr(url,_T("www.test.com")) != NULL))){
 return;
 } 

 CComPtr<IDispatch> frameDocDisp;
 hr = spTempWebBrowser->get_Document(&frameDocDisp);
 if((hr == S_OK) && (frameDocDisp != NULL))
 {
 CComQIPtr<IHTMLDocument3> spHTMLDoc = frameDocDisp;
 // ... Do someting useful ...

 }

 }else if(spTempWebBrowser && m_spWebBrowser && m_spWebBrowser.IsEqualObject(spTempWebBrowser))
 {
 CComPtr<IDispatch> spDispDoc;
 hr = m_spWebBrowser->get_Document(&spDispDoc);

 if ((hr == S_OK) && (spDispDoc != NULL))
 {
 CComQIPtr<IHTMLDocument2> spHTMLDoc = spDispDoc;
 if(spHTMLDoc)
 {
 // ... Do someting useful ...
 }
 }
 }
}
</code></pre>

<p>If you think that you have anything to share (suggestions/corrections/alternatives) then please do so.. :)</p>

<p>Thanks,</p>
 </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2010-07-21T10:29:33.243 回答</div> </div> </div> </div> </div></div> </div> <div id="sidebar" class="show-votes" role="complementary" aria-label="sidebar"> <div class="module sidebar-related"> <h4 id="h-related">Related</h4> <div class="related js-gps-related-questions" data-tracker="rq=1"> <div class="spacer"> <a href="/questions/18633220" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">4</div> </a> <a href="/questions/18633220" class="question-hyperlink">android - 两次相加</a> </div><div class="spacer"> <a href="/questions/18633222" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/18633222" class="question-hyperlink">regex - 在密码查询中使用正则表达式进行错误匹配</a> </div><div class="spacer"> <a href="/questions/18633226" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a 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