I am working with Qt creator to make a GUI program that takes in different URLs and will download and display the html code.
The user can add different URLs to a listWidget. Then the user can select a specific URL and download the html which will be displayed beside the list of URLs.
The problem I am having is getting the text area to update after the reply is received.
main.cpp - Basically just shows the window.
#include <QtGui/QApplication>
#include "mainwindow.h"
#include "htmlmanager.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.h - Pretty straight forward. Contains the object html that will be used to request the html from the inputted website.
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "htmlmanager.h"
#include <QString>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
HtmlManager html;
private slots:
void on_addButton_clicked();
void on_actionExit_triggered();
void on_removeButton_clicked();
void on_downloadButton_clicked();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp - This is the beginning of the problem. If you look down at the "downloadButton_clicked()" function, you see that it fetches the html by sending a request. However, the reply isn't recieved before the next line so the text field is set to "".
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_addButton_clicked()
{
if(!ui->lineEdit->text().isEmpty())
{
ui->listWidget->addItem(ui->lineEdit->text());
}
else
{
qDebug() << "Input field is empty.";
}
}
void MainWindow::on_actionExit_triggered()
{
//doesn't do anything right now
}
void MainWindow::on_removeButton_clicked()
{
if(ui->listWidget->currentItem()) //If an item is selected
{
delete ui->listWidget->currentItem();
}
else
{
qDebug() << "No selection";
}
}
void MainWindow::on_downloadButton_clicked()
{
if(ui->listWidget->currentItem()) //If an item is selected
{
html.fetch(ui->listWidget->currentItem()->text());
ui->textBrowser->setText(html.str);
}
else
{
qDebug() << "No selection";
}
}
htmlmaneger.h
#ifndef HTMLMANAGER_H
#define HTMLMANAGER_H
#include <QObject>
#include <QDebug>
#include <QtNetwork>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QString>
class HtmlManager : public QObject
{
Q_OBJECT
public:
HtmlManager();
void fetch(QString Url);
QString str;
public slots:
void replyFinished(QNetworkReply* pReply);
private:
QNetworkAccessManager* m_manager;
};
#endif // HTMLMANAGER_H
htmlmanager.cpp - Once the reply is received, it stores the html in the QString "str"
#include "htmlmanager.h"
HtmlManager::HtmlManager()
{
m_manager = new QNetworkAccessManager(this);
connect(m_manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
}
void HtmlManager::fetch(QString Url)
{
m_manager->get(QNetworkRequest(QUrl(Url)));
qDebug() << "Sending network request.";
}
void HtmlManager::replyFinished(QNetworkReply* pReply)
{
qDebug() << "Recieved network reply.";
QByteArray data=pReply->readAll();
str = data;
}
Is there an easy way to send the value of str to the MainWindow class once the reply is received, or is there a way for the onclick function to wait to update the text area until after a reply is received?