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PORequest with QNetworkAccessManager
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copied!<p>I have a strange problem with getting reply from get request with QNetworkAccessManager.</p> <p>This is code of class: </p> <p>requester.h</p> <pre><code>#ifndef REQUESTER_H #define REQUESTER_H #include <QtNetwork/QNetworkAccessManager> #include <QtNetwork/QNetworkReply> #include <QtCore/QtCore> #include <QVector> #include <QObject> #include <QMessageBox> class Requester : public QObject { Q_OBJECT public: explicit Requester(QObject *parent = 0); ~Requester(); QString get_last_reply(); void send_request(); private: QNetworkAccessManager *manager; QVector<QString> replies; private slots: void get_reply(QNetworkReply *reply); void get_reply_error(QNetworkReply::NetworkError err); }; #endif // REQUESTER_H </code></pre> <p>requester.cpp</p> <pre><code>#include "requester.h" Requester::Requester(QObject *p) : QObject(p) , manager(new QNetworkAccessManager) { QObject::connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(get_reply(QNetworkReply*))); } Requester::~Requester() { delete manager; } void Requester::get_reply(QNetworkReply *reply) { QObject::connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(get_reply_error(QNetworkReply::NetworkError))); QByteArray res = reply->readAll(); QString data = res.data(); replies.push_back(data); QObject::disconnect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(get_reply_error(QNetworkReply::NetworkError))); reply->deleteLater(); } void Requester::get_reply_error(QNetworkReply::NetworkError err) { QMessageBox msg; msg.setText(QString::number(err)); msg.setStandardButtons(QMessageBox::Discard); msg.exec(); } QString Requester::get_last_reply() { if(!(replies.isEmpty())) { QString res = replies.back(); replies.pop_back(); return res; } return ""; } void Requester::send_request() { QNetworkRequest request; request.setUrl(QUrl("http://127.0.0.1")); request.setRawHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.60 Safari/537.17"); manager->get(request); //QMessageBox *msg = new QMessageBox; //msg->exec(); } </code></pre> <p>Reply is written in textEdit by this function</p> <pre><code>void MainWindow::ret_out(QString str) { ui->out->setText(str); } </code></pre> <p>Now main.cpp </p> <pre><code>int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; Requester req; req.send_request(); //QMessageBox *msg = new QMessageBox; //msg->exec(); QString buf = req.get_last_reply(); w.show(); w.ret_out(buf); return a.exec(); } </code></pre> <p>Using this code I have empty textEdit. But if uncomment </p> <pre><code>QMessageBox *msg = new QMessageBox; msg->exec(); </code></pre> <p>in Requester::send_request or in main.cpp then textEdit contains server answer.</p> <p><strong>New Update</strong></p> <p>Now I have this code and it works. Maybe it's not the best variation, but I'll listen to your advices with greate pleasure :)</p> <pre><code>void Requester::send_request(QUrl url) { QEventLoop loop; loop.connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(get_reply(QNetworkReply*))); loop.connect(this, SIGNAL(done()), &loop, SLOT(quit())); QNetworkRequest request; request.setUrl(url); request.setRawHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.60 Safari/537.17"); manager->get(request); loop.exec(QEventLoop::AllEvents); loop.disconnect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(get_reply(QNetworkReply*))); loop.disconnect(this, SIGNAL(done()), &loop, SLOT(quit())); } </code></pre>

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