c++ - 执行 qt 网络请求

Question

我正在尝试连接到网站并使用 qt 执行请求，到目前为止我得到了这段代码，但它告诉我以下错误:

#include <QCoreApplication>
#include <QDebug>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QUrl>
#include <QUrlQuery>

void sendRequest();

int main(int argc, char *argv[]) { 
    QCoreApplication a(argc, argv);
    sendRequest();
    return a.exec();
}

void sendRequest() {    
QNetworkAccessManager *manager = new QNetworkAccessManager(this);   connect(manager, SIGNAL(finished(QNetworkReply*)),      this, SLOT(replyFinished(QNetworkReply*)));

manager->get(QNetworkRequest(QUrl("http://qt-project.org")));
}

它说:

Error 1 error C2355: 'this' : can only be referenced inside non-static member functions or non-static data member initializers c:\Users\Synturas\documents\visual studio 2013\Projects\qt_request\qt_request\main.cpp 19 1 qt_request

Error 2 error C2355: 'this' : can only be referenced inside non-static member functions or non-static data member initializers c:\Users\Synturas\documents\visual studio 2013\Projects\qt_request\qt_request\main.cpp 21 1 qt_request

Error 3 error C3861: 'connect': identifier not found c:\Users\Synturas\documents\visual studio 2013\Projects\qt_request\qt_request\main.cpp 20 1 qt_request 4 IntelliSense: 'this' may only be used inside a nonstatic member function c:\Users\Synturas\Documents\Visual Studio 2013\Projects\qt_request\qt_request\main.cpp 19 61 qt_request

5 IntelliSense: identifier "connect" is undefined c:\Users\Synturas\Documents\Visual Studio 2013\Projects\qt_request\qt_request\main.cpp 20 2 qt_request

6 IntelliSense: 'this' may only be used inside a nonstatic member function c:\Users\Synturas\Documents\Visual Studio 2013\Projects\qt_request\qt_request\main.cpp 21 3 qt_request

(我在这个项目中使用 VS2013，如果相关的话)

Answer 1

试试这个例子:

解释:你创建了一个新类，它将为你完成所有工作，在 main.cpp 中创建这个类的实例并调用方法。

*.h

#ifndef NET_H
#define NET_H

#include <QObject>

#include <QtCore>
#include <QNetworkAccessManager>
#include <QNetworkReply>

class Net : public QObject
{
Q_OBJECT
  QNetworkAccessManager *manager;
private slots:
  void replyFinished(QNetworkReply *);//slot, we want catch responce
public:
  void CheckSite(QString url);//our method
};



#endif // NET_H

*.cpp

#include "net.h"

void Net::replyFinished(QNetworkReply *reply) //this slot called when we have responce
{ 
qDebug() << reply->readAll(); //we read result and print it(also you can save it in some variable and use in code
}

void Net::CheckSite(QString url) 
{
  QUrl qrl(url);//QUrl has network adress
  manager = new QNetworkAccessManager(this);//create manager
  connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));//do connection with nededed signal and slot which we alredy wrote
  manager->get(QNetworkRequest(qrl));//send get request
}

主要

#include "net.h"


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Net handler;//create instance
    handler.CheckSite("http://qt-project.org");//set path and wait for responce

    return a.exec();
}

结果:Qt站点的html代码