QT：轻松获取网页源码

获取网页源码的小例子，代码很简单，就不多作解释了。

不过一定要注意网页的编码问题，否则会出现乱码的！！！

#include <QtCore>
#include <QtNetwork>

//网页地址
const QString URLSTR = "http://www.csdn.net/";
//储存网页代码的文件
const QString FILE_NAME = "code.html";

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    QUrl url(URLSTR);
    QNetworkAccessManager manager;
    QEventLoop loop;
    QTextCodec *codec;
    QNetworkReply *reply;

    qDebug() << "Reading html code form " << URLSTR;
    reply = manager.get(QNetworkRequest(url));
    //请求结束并下载完成后，退出子事件循环
    QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    //开启子事件循环
    loop.exec();

    //获取源码，打开文件
    QFile file(FILE_NAME);
    if( !file.open(QIODevice::WriteOnly | QIODevice::Text) )
    {
        qDebug() << "Cannot open the file: " << FILE_NAME;
        return 0;
    }
    QTextStream out(&file);
    QString codeContent = reply->readAll();

    //将获取到的网页源码写入文件
    //一定要注意编码问题，否则很容易出现乱码的
    codec = QTextCodec::codecForHtml(codeContent.toAscii());
    codeContent = codec->toUnicode(codeContent.toAscii());
    out.setCodec(codec);
    out << codeContent << endl;
    file.close();
    qDebug() << "Finished, the code have written to " << FILE_NAME;
    return 0;
}

http://blog.csdn.net/small_qch/article/details/7200271