Question

我试图连接到一个网站并用qt执行请求，到目前为止我得到了这个代码，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：

错误1错误C2355：＆＃39;此＆＃39; ：只能在非静态内部引用   成员函数或非静态数据成员   初始化程序c：\ Users \ Synturas \ documents \ visual studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 19 1 qt_request

错误2错误C2355：＆＃39;此＆＃39; ：只能在非静态内部引用   成员函数或非静态数据成员   初始化程序c：\ Users \ Synturas \ documents \ visual studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 21 1 qt_request

错误3错误C3861：＆＃39; connect＆＃39;：标识符不是   找到c：\ Users \ Synturas \ documents \ visual studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 20 1 qt_request     4智能感知：＆＃39;这个＆＃39;只能在非静态成员中使用   function c：\ Users \ Synturas \ Documents \ Visual Studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 19 61 qt_request

5智能感知：标识符＆＃34;连接＆＃34;是   undefined c：\ Users \ Synturas \ Documents \ Visual Studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 20 2 qt_request

6智能感知：＆＃39;这个＆＃39;只能在非静态成员中使用   function c：\ Users \ Synturas \ Documents \ Visual Studio   2013 \ Projects \ qt_request \ qt_request \ main.cpp 21 3 qt_request

（我正在使用VS2013进行此项目，如果这是相关的）

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。

*的.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

#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网站的HTML代码

做一个qt网络请求

1 个答案: