How to do HTTP Get and Post using Qt
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{{CodeSnippet | {{CodeSnippet | ||
|id=... | |id=... | ||
| − | |platform= | + | |platform=Qt |
|devices= Nokia 5800 XpressMusic,Nokia N97, Nokia E72 | |devices= Nokia 5800 XpressMusic,Nokia N97, Nokia E72 | ||
|category=Qt | |category=Qt | ||
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{{Note|<b></b> | {{Note|<b></b> | ||
* This code snippet is developed using carbide C++ v2.4. | * This code snippet is developed using carbide C++ v2.4. | ||
| − | * One can use Qt creator for developing this sort of application please go through this [http://wiki.forum.nokia.com/index.php/Using_Qt_Creator_With_Symbian | + | * One can use Qt creator for developing this sort of application please go through this [http://wiki.forum.nokia.com/index.php/Using_Qt_Creator_With_Symbian article] for more details. |
}} | }} | ||
Revision as of 14:32, 1 April 2011
Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic,Nokia N97, Nokia E72
Compatibility
Platform(s): Qt
Article
Keywords: QNetworkAccessManager,QNetworkReply,QNetworkRequest,QUrl,QString,QLabel,QByteArray
Created: (25 Mar 2010)
Last edited: kiran10182
(01 Apr 2011)
Contents |
Overview
This article will help the developer to write an Qt program which performs the action of HTTP Get and Post. These two terms are very important when an web based application needs to be developed.
This is a very basic article this can be extended to suite the developers need.
Prerequisite
- Install Qt for Symbian:Installing Qt on Symbian
Note:
- This code snippet is developed using carbide C++ v2.4.
- One can use Qt creator for developing this sort of application please go through this article for more details.
capability required
- NetworkServices
UI design (.ui file)
The below screenshot shows the ui design file.
Header File
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QMessageBox>
#include<QByteArray>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
protected:
void changeEvent(QEvent *e);
private slots:
void finished(QNetworkReply *reply);
void DoHttpGet();
void activateGetWidgets();
void HideWidgets();
void clearWidgets();
void activatePostWidgets();
private:
Ui::MainWindow *ui;
QNetworkAccessManager *nam;
};
#endif // MAINWINDOW_H
Source File
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
nam = new QNetworkAccessManager(this);
HideWidgets();
connect(ui->getButton,SIGNAL(clicked()),this,SLOT(activateGetWidgets()));
connect(ui->submitButton,SIGNAL(clicked()),this,SLOT(DoHttpGet()));
connect(ui->resetButton,SIGNAL(clicked()),this,SLOT(clearWidgets()));
connect(nam,SIGNAL(finished(QNetworkReply*)),this,SLOT(finished(QNetworkReply*)));
connect(ui->postButton,SIGNAL(clicked()),this,SLOT(activatePostWidgets()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}
void MainWindow::activateGetWidgets()
{
ui->urlLabel->setHidden(false);
ui->urlLine->setHidden(false);
ui->submitButton->setHidden(false);
ui->textBrowser->setHidden(false);
ui->responseTitleLabel->setHidden(false);
ui->getButton->setHidden(true);
ui->postButton->setHidden(true);
}
void MainWindow::activatePostWidgets()
{
ui->dataLabel->setHidden(false);
ui->dataLine->setHidden(false);
activateGetWidgets();
}
void MainWindow::finished(QNetworkReply *reply)
{
if(reply->error() == QNetworkReply::NoError)
{
ui->textBrowser->setText(reply->readAll());
}
else
{
ui->textBrowser->setText(reply->errorString());
}
}
void MainWindow::DoHttpGet()
{
ui->resetButton->setHidden(false);
QString url = ui->urlLine->text();
QString data = ui->dataLine->text();
QByteArray postData;
postData.append(data.toAscii());
if(postData.isEmpty() == true)
{
nam->get(QNetworkRequest(QUrl(url)));
}
else
{
nam->post(QNetworkRequest(QUrl(url)),postData);
}
}
void MainWindow::HideWidgets()
{
ui->urlLabel->setHidden(true);
ui->urlLine->setHidden(true);
ui->dataLabel->setHidden(true);
ui->dataLine->setHidden(true);
ui->submitButton->setHidden(true);
ui->responseTitleLabel->setHidden(true);
ui->textBrowser->setHidden(true);
ui->resetButton->setHidden(true);
}
void MainWindow::clearWidgets()
{
ui->urlLabel->setHidden(true);
ui->urlLine->setHidden(true);
ui->dataLabel->setHidden(true);
ui->dataLine->setHidden(true);
ui->submitButton->setHidden(true);
ui->responseTitleLabel->setHidden(true);
ui->textBrowser->setHidden(true);
ui->resetButton->setHidden(true);
ui->urlLine->clear();
ui->textBrowser->clear();
ui->dataLine->clear();
ui->getButton->setHidden(false);
ui->postButton->setHidden(false);
}
Output Screenshots
- Initial Screen Asking the user to select and http get or post.
- Screenshot after user has clicked the get button.
- Screenshot after user has clicked the post button.
Sample Application
- A sample Qt Application can be downloaded from this File:HttpGet&Post.zip
