blocks|key|860343|text|事实证明，您需要监视与QWebPage关联的QNetworkAccessManager，并等待finished(...)信号。然后，您可以检查HTTP响应并通过请求QNetworkRequest::HttpStatusCodeAttribute属性来检查其状态代码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|860344|最好用代码来解释：|860345|void+MyClass::initWebPage()
{
++myQWebPage+=+new+QWebPage(this);
++connect(
++++myQWebPage->networkAccessManager(),+SIGNAL(finished(QNetworkReply+*)),
++++this,+SLOT(httpResponseFinished(QNetworkReply+*))
++);
}

void+MyClass::httpResponseFinished(QNetworkReply+*+reply)
{
++switch+(reply->error())
++{
++++case+QNetworkReply::NoError:
++++++//+No+error
++++++return;
++++case+QNetworkReply::ContentNotFoundError:
++++++//+404+Not+found
++++++failedUrl+=+reply->request.url();
++++++httpStatus+=+reply->attribute(
++++++++QNetworkRequest::HttpStatusCodeAttribute).toInt();
++++++httpStatusMessage+=+reply->attribute(
++++++++QNetworkRequest::HttpReasonPhraseAttribute).toByteArray();
++++++break;
++++}
}|code-block|syntax|javascript|860346|有更多的NetworkErrors可供选择，例如，用于TCP+error或HTTP401。|860347|entityMap|0|LINK|mutability|MUTABLE|url|http://doc.qt.io/qt-5/qnetworkaccessmanager.html|1|http://doc.qt.io/qt-5/qnetworkaccessmanager.html#finished|2|http://doc.qt.io/qt-5/qnetworkreply.html#NetworkError-enum^0|2A|14|M|L|0|1B|D|1|0|0|0|4|D|2|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]|$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|6|7|19|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|O|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]|Y|$5|R|S|T|E|$U|Z]]]]

Turns out you need to monitor the <a href="http://doc.qt.io/qt-5/qnetworkaccessmanager.html" rel="nofollow noreferrer">QNetworkAccessManager</a> associated with your QWebPage and wait for a <a href="http://doc.qt.io/qt-5/qnetworkaccessmanager.html#finished" rel="nofollow noreferrer">finished(...)</a> signal. You can then inspect the HTTP response and check its status code by asking for the <code>QNetworkRequest::HttpStatusCodeAttribute</code> attribute.

It's better explained in code:

<pre><code>void MyClass::initWebPage()
{
 myQWebPage = new QWebPage(this);
 connect(
 myQWebPage-&gt;networkAccessManager(), SIGNAL(finished(QNetworkReply *)),
 this, SLOT(httpResponseFinished(QNetworkReply *))
 );
}

void MyClass::httpResponseFinished(QNetworkReply * reply)
{
 switch (reply-&gt;error())
 {
 case QNetworkReply::NoError:
 // No error
 return;
 case QNetworkReply::ContentNotFoundError:
 // 404 Not found
 failedUrl = reply-&gt;request.url();
 httpStatus = reply-&gt;attribute(
 QNetworkRequest::HttpStatusCodeAttribute).toInt();
 httpStatusMessage = reply-&gt;attribute(
 QNetworkRequest::HttpReasonPhraseAttribute).toByteArray();
 break;
 }
}
</code></pre>

There are more <a href="http://doc.qt.io/qt-5/qnetworkreply.html#NetworkError-enum" rel="nofollow noreferrer">NetworkErrors</a> to choose from, e.g. for TCP errors or HTTP 401.

blocks|key|1075019|text|这是我在一个移植项目中使用的。它检查应答并决定是否开始后退请求。后退部分正在进行中，但我留下了评论。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1075020|QNetworkReply*+reply+=+qobject_cast<QNetworkReply*>(sender());
Q_CHECK_PTR(reply);

QVariant+statusCode+=+reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
if+(!statusCode.isNull()+&&+statusCode.toInt()+>=+400){
++++//INVALID_SERVER_RESPONSE_BACKOFF;
++++qDebug()+<<+"server+returned+invalid+response."+<<+reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
++++return;
}else+if+(!statusCode.isNull()+&&+statusCode.toInt()+!=+200){
++++//INVALID_SERVER_RESPONSE_NOBACKOFF;
++++qDebug()+<<+"server+returned+invalid+response."+<<+reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
++++return;
}|code-block|syntax|javascript|1075021|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I'm using in a porting project. It checks the reply and decides to start backing off making request or not. The backing off part is in progress but I left the comments in.

<pre><code>QNetworkReply* reply = qobject_cast&lt;QNetworkReply*&gt;(sender());
Q_CHECK_PTR(reply);

QVariant statusCode = reply-&gt;attribute(QNetworkRequest::HttpStatusCodeAttribute);
if (!statusCode.isNull() &amp;&amp; statusCode.toInt() &gt;= 400){
 //INVALID_SERVER_RESPONSE_BACKOFF;
 qDebug() &lt;&lt; "server returned invalid response." &lt;&lt; reply-&gt;attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
 return;
}else if (!statusCode.isNull() &amp;&amp; statusCode.toInt() != 200){
 //INVALID_SERVER_RESPONSE_NOBACKOFF;
 qDebug() &lt;&lt; "server returned invalid response." &lt;&lt; reply-&gt;attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
 return;
}
</code></pre>

I'm writing a thumbnail generator as per <a href="http://doc.qt.nokia.com/latest/qwebpage.html#using-qwebpage-in-a-widget-less-environment">an example in the QtWebkit documentation</a>. I would like to avoid screenshots of error pages such as <code>404 not found</code> or <code>503 Internal server error</code>.

However, the <a href="http://doc.qt.nokia.com/latest/qwebpage.html#loadFinished">QWebPage::loadFinished()</a> signal is always emitted with <code>ok = true</code> even when the page gives an HTTP error. Is there a way in QtWebkit to check the HTTP status code on a response?

QtWebkit: How to check HTTP status code?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在根据编写一个缩略图生成器。我想避免错误页面的屏幕截图，比如404 not found或503 Internal server error。但是，即使页面出现错误，ok = true也始终会发出HTTP信号。在QtWebkit中有没有办法检查响应上的状态码？

问QtWebkit:如何查看HTTP状态码？
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问QtWebkit:如何查看HTTP状态码？
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