QNetworkAccessManager 的使用

   //client.h 
   
class Client : publicQObject {
        Q_OBJECT
    public:
        explicit Client(const QString &url);
        void sendData(const QString &data);
    publicslots:
        void replyFinished(QNetworkReply*reply);
    private:
        void waitForFinish(const QHttp  &http);
        QNetworkAccessManager*m_manager;
        QString mUrl;
};


//client.cpp
#include <QNetworkAccessManager>#include <QNetworkReply>#include <QUrl>
Client::Client(const QString &url) {
    mUrl =url;
    m_manager = new QNetworkAccessManager(this);
    connect(m_manager, SIGNAL(finished(QNetworkReply*)), this,
            SLOT(replyFinished(QNetworkReply*)));
}

void Client::replyFinished(QNetworkReply*reply) { // 应答槽函数
    if (reply && reply->error() ==QNetworkReply::NoError) {
        QByteArray data = reply->readAll();
        qDebug() << "---------------------------------
" <<data;
    } else{
        //error
}
    reply->close();
}

void Client::sendData(const QString &data) { // data为发送的数据
    QNetworkRequest request;
    request.setUrl(QUrl(mUrl)); // 设置url
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded"); // 设置头信息
    m_manager->post(request, data.toUtf8());
}

QString Client::sendData(const QString &data) {
    m_manager = new QNetworkAccessManager(this);
    QNetworkRequest request;
    QEventLoop loop; // 使用QEventLoop实现阻塞
    QNetworkReply *reply;

    request.setUrl(QUrl(mUrl));
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
    reply = m_manager->post(request, data.toUtf8());

    connect(m_manager, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit())); // connect
    loop.exec();
    QByteArray byteArray = reply->readAll();
    qDebug() <<byteArray;
    delete reply;
    delete m_manager;
    returnQString(byteArray);
}