qt截获html请求（继承QNetworkAccessManager和QNetworkReply）

QtWebkit加载html页面，html中会有很多的请求，比如<img id="testImg" src="http://*.jpg" width="200" height="200" title="test图片"/>等等，如果想截获这些请求，然后自定义应答...

1.定义一个类，继承QNetworkAccessManager（请求）

#ifndef NETWORKACCESSMANAGER_H

#define NETWORKACCESSMANAGER_H

 

#include <QtNetwork/QNetworkAccessManager>

#include <QtNetwork/QNetworkProxy>

#include <QtNetwork/QNetworkReply>

#include <QtNetwork/QNetworkRequest>

 

class NetworkAccessManager : public QNetworkAccessManager

{

 

    Q_OBJECT

 

public:

    explicit NetworkAccessManager(QNetworkAccessManager *manager, QObject *parent);

 

protected:

    QNetworkReply * createRequest(QNetworkAccessManager::Operation operation,

                       const QNetworkRequest &request, QIODevice *device);

};

 

#endif // NETWORKACCESSMANAGER_H

 

#include "networkaccessmanager.h"

 

#include <QtCore/QDebug>

 

NetworkAccessManager::NetworkAccessManager(QNetworkAccessManager *manager, QObject *parent)

    : QNetworkAccessManager(parent)

{

    setCache(manager->cache());

    setCookieJar(manager->cookieJar());

    setProxy(manager->proxy());

    setProxyFactory(manager->proxyFactory());

}

 

QNetworkReply * NetworkAccessManager::createRequest(QNetworkAccessManager::Operation operation,

                   const QNetworkRequest &request, QIODevice *device)

{

    if (request.url().scheme() != "http")

            return QNetworkAccessManager::createRequest(operation, request, device);

    else

     return new BlobReply(request.url);

}

2.定义一个类，继承QNetworkReply（应答）

#ifndef BLOBREPLY_H

#define BLOBREPLY_H

 

#include <QtNetwork/QNetworkReply>

 

class BlobReply : public QNetworkReply

{

    Q_OBJECT

 

public:

    BlobReply(const QUrl &url);

    void abort();

 

protected:

    qint64 readData(char *data, qint64 maxSize);

 

};

 

#endif // BLOBREPLY_H

 

#include "blobreply.h"

 

#include <QtCore/QDebug>

 

BlobReply::BlobReply(const QUrl &url)

    : QNetworkReply()

{

    qDebug() << url.toString();

}

 

void BlobReply::abort()

{

 

}

 

qint64 BlobReply::readData(char *data, qint64 maxSize)

{

    return -1;

}

3.在初始化webview的时候，实例化上面的东东

QNetworkAccessManager *oldManager = ui->webView->page()->networkAccessManager();

NetworkAccessManager *newManager = new NetworkAccessManager(oldManager, this);

ui->webView->page()->setNetworkAccessManager(newManager);

ui->webView->page()->setForwardUnsupportedContent(true);

 

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http://blog.sina.com.cn/s/blog_671732440100y3xx.html