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POHow to set QNetworkReply properties to get correct NCBI pages?
 

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  1. POHow to set QNetworkReply properties to get correct NCBI pages?
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    <p>I try to get this following url using the downloadURL function as follows:</p> <p><a href="http://www.ncbi.nlm.nih.gov/nuccore/27884304" rel="nofollow noreferrer">http://www.ncbi.nlm.nih.gov/nuccore/27884304</a></p> <p>But the data is not as what we can see through the browser, now I know it's because some correct information (such as browser type) is needed. How can I know what kind of information I need to set, and how can I set it? (By setHeader function or some other way??) </p> <p>In VC++, we can use CInternetSession and CHttpConnection Object to get the correct data without setting any other detail information, is there any similar way in Qt or other cross-platform C++ network lib?? (Yes, I need the the cross-platform property.) </p> <pre><code>QNetworkReply::NetworkError downloadURL(const QUrl &amp;url, QByteArray &amp;data) { QNetworkAccessManager manager; QNetworkRequest request(url); request.setHeader(QNetworkRequest::ContentTypeHeader ,"Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729)"); QNetworkReply *reply = manager.get(request); QEventLoop loop; QObject::connect(reply, SIGNAL(finished()), &amp;loop, SLOT(quit())); loop.exec(); QVariant statusCodeV = reply-&gt;attribute(QNetworkRequest::RedirectionTargetAttribute); QUrl redirectTo = statusCodeV.toUrl(); if (!redirectTo.isEmpty()) { if (redirectTo.host().isEmpty()) { const QByteArray newaddr = ("http://"+url.host()+redirectTo.encodedPath()).toAscii(); redirectTo.setEncodedUrl(newaddr); redirectTo.setHost(url.host()); } return (downloadURL(redirectTo, data)); } if (reply-&gt;error() != QNetworkReply::NoError) { return reply-&gt;error(); } data = reply-&gt;readAll(); delete reply; return QNetworkReply::NoError; } </code></pre> <p>By VC, we can just do this, then the correct data is in the CHttpFile.</p> <pre><code>CString downloadURL (CString sGetFromURL) { // create an internet session CInternetSession csiSession; int pos; BOOL neof; // parse URL to get server/object/port DWORD dwServiceType; CString sServerName; CString sObject; INTERNET_PORT nPort; CHttpConnection* pHTTPServer = NULL; CHttpFile* pFile = NULL; AfxParseURL ( sGetFromURL, dwServiceType, sServerName, sObject, nPort ); // open HTTP connection pHTTPServer = csiSession.GetHttpConnection ( sServerName, nPort ); // get HTTP object pFile = pHTTPServer-&gt;OpenRequest ( CHttpConnection::HTTP_VERB_GET, sObject, NULL, 1, NULL, NULL, INTERNET_FLAG_RELOAD ); pFile-&gt;SendRequest(); } </code></pre>
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