qt - QWebView缓存

Question

我正在 QT 5.2 中编写一个简单的 WebView 应用程序。我正在使用的网站有点重，因此我需要缓存它。但问题是，当单击页面并访问子页面时，我收到了 QIODevice::read: device not open 错误。最后，我得到了一张空白的白页。我哪里出错了？

代码如下:

WebsiteWidget::WebsiteWidget(QWidget *parent) :
    QWidget(parent)
{
    m_url = QUrl("http://www.google.com/");
    QWebSettings::globalSettings()->setAttribute(QWebSettings::DeveloperExtrasEnabled, true);
    QWebSettings::globalSettings()->setAttribute(QWebSettings::LocalStorageEnabled, true);
    QWebSettings::globalSettings()->setAttribute(QWebSettings::JavascriptEnabled, true);
    QWebSettings::globalSettings()->setAttribute(QWebSettings::PluginsEnabled, true);

    m_websiteContentLayout = new QHBoxLayout();
    m_webView = new QWebView(this);

    QNetworkAccessManager* manager = new QNetworkAccessManager(this);
    QNetworkDiskCache* diskCache = new QNetworkDiskCache(this);

    QString location = QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
    diskCache->setCacheDirectory(location);
    manager->setCache(diskCache);
    m_webView->page()->setNetworkAccessManager(manager);
    m_webView->page()->settings()->setMaximumPagesInCache(10);

    QNetworkRequest request = QNetworkRequest();
    request.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
    request.setUrl(m_url);

    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
    manager->get(request);

    m_websiteContentLayout->addWidget(m_webView);
    m_websiteContentLayout->setContentsMargins(0, 0, 0, 0);
    this->setLayout(m_websiteContentLayout);
}

void WebsiteWidget::replyFinished(QNetworkReply* reply)
{
    QByteArray data=reply->readAll();
    QString str(data);
    if(reply->url() == m_url)
    {
        m_webView->setHtml(str, reply->url());
    }
}

Answer 1

在我制作之后，我已经让离线存储工作了:

webView->settings()->setAttribute(QWebSettings::LocalStorageEnabled, true);webView->settings()->enablePersistentStorage(QDir::homePath());

其他设置(setOfflineStorageDefaultQuota 等)似乎是可选的。(有人可能想将 homePath 更改为更好的东西，如 tmpPath 等)