QNetworkAccessManager发送请求失败

basic QNetworkAccessManager fails to send requestion

本文关键字：失败 请求 QNetworkAccessManager      更新时间：2023-10-16

在我的代码中没有错误，虽然从来没有任何请求数据包击中我的服务器。我运行tcpdump端口80，没有任何东西通过线，wireshark也这么说。

//coreeng.h 

#ifndef COREENG_H
#define COREENG_H
#include <QObject>
#include <QNetworkAccessManager>
class coreEng : public QObject
{
    Q_OBJECT
        public:

        private slots:
        public slots:
            void connect();
            void url();
            void finishedSlot(QNetworkReply* reply);

        private:
            QNetworkAccessManager* nam;
};
#endif // COREENG_H
//coreengine.cpp 

#include "coreeng.h"
#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QImageReader>
coreEng::coreEng(QObject *parent) :
    QObject(parent)
{
}
explicit coreEng(QObject *parent = 0)
    {
        nam = new QNetworkAccessManager();
    }
void coreEng::connect(){
    QObject::connect(nam, SIGNAL(finished(QNetworkReply*)),
    this, SLOT(finishedSlot(QNetworkReply*)));
}
void coreEng::url(){
    QUrl url("http://www.myserver.com");
    QNetworkReply* reply = nam->get(QNetworkRequest(url));
}
void coreEng::finishedSlot(QNetworkReply* reply){
    QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
    QVariant redirectionTargetUrl = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
    if (reply->error() == QNetworkReply::NoError)
    {
        QImageReader imageReader(reply);
        QImage pic = imageReader.read();
        QByteArray bytes = reply->readAll();  // bytes
        QString string(bytes); // string
    }
    else
    {
    }
    delete reply();
}
//main.cpp 

#include <QCoreApplication>
#include "coreeng.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    coreEng mConnect;
    mConnect.connect();
    return a.exec();
}

您从不调用coreEng::url()，因此您从不发出请求。

我也不确定你的构造函数是否正确。为什么不抛弃显式构造函数并在默认构造函数中创建QNetworkAccessManager呢?

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