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How to do HTTP Get and Post using Qt

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[[Category:Qt]]
+
[[Category:Networking]][[Category:Qt]]
{{CodeSnippet
+
{{ArticleMetaData <!-- v1.2 -->
|id=...
+
|sourcecode= [[Media:HttpGet&Post.zip]]
|platform=Qt
+
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
|devices= Nokia 5800 XpressMusic,Nokia N97, Nokia E72
+
|devices= Nokia 5800 XpressMusic,Nokia N97, Nokia E72, Nokia N8
|category=Qt
+
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
 +
|platform= Qt (tested Qt 4.7 Symbian^3)
 +
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
 +
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 +
|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
 +
|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
 +
|keywords= QNetworkAccessManager,QNetworkReply,QNetworkRequest,QUrl
 +
|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
 +
|translated-by= <!-- [[User:XXXX]] -->
 +
|translated-from-title= <!-- Title only -->
 +
|translated-from-id= <!-- Id of translated revision -->
 +
|review-by= <!-- After re-review: [[User:username]] -->
 +
|review-timestamp= <!-- After re-review: YYYYMMDD -->
 +
|update-by= <!-- After significant update: [[User:username]]-->
 +
|update-timestamp= <!-- After significant update: YYYYMMDD -->
 +
|creationdate= 20100325
 +
|author= [[User:Gaba88]]
 +
<!-- The following are not in current metadata -->
 
|subcategory= Networking
 
|subcategory= Networking
|creationdate=March 25, 2010
 
|keywords= QNetworkAccessManager,QNetworkReply,QNetworkRequest,QUrl,QString,QLabel,QByteArray
 
 
}}
 
}}
  
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=Overview=
 
=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.  
+
{{Abstract|This article is a basic [http://doc.qt.nokia.com/4.7/qwidget.html QWidget] application which performs '''HTTP GET''' and '''POST''' for a user specified URL. }}
  
This is a very basic article this can be extended to suite the developers need.
+
This is a very basic article this can be extended to suite the developers need. Note that it can only be used in portrait mode - it does not scale properly when rotated.
  
 
=Prerequisite=
 
=Prerequisite=
  
* Install Qt for Symbian:[[Installing Qt on Symbian]]
+
* Install the [[Qt SDK]]
 
+
{{Note|<b></b>
+
* This code snippet is developed using carbide C++ v2.4.
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* 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.
+
}}
+
 
+
  
 
=capability required=
 
=capability required=
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= Header File =
 
= Header File =
  
<code cpp>
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<code cpp-qt>
 
#ifndef MAINWINDOW_H
 
#ifndef MAINWINDOW_H
 
#define MAINWINDOW_H
 
#define MAINWINDOW_H
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= Source File =
 
= Source File =
  
<code cpp>
+
<code cpp-qt>
 
#include "mainwindow.h"
 
#include "mainwindow.h"
 
#include "ui_mainwindow.h"
 
#include "ui_mainwindow.h"
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=Reference Links=
 
=Reference Links=
  
[http://doc.trolltech.com/4.6/qnetworkaccessmanager.html QNetworkAccessManager]
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*[http://doc.trolltech.com/4.6/qnetworkaccessmanager.html QNetworkAccessManager]
 +
*See also [http://doc.qt.nokia.com/4.7/network-http.html HTTP Example][[Category:MeeGo Harmattan]] [[Category:Symbian]]
 +
[[Category:Code Examples]]

Latest revision as of 04:17, 11 October 2012

Article Metadata
Code ExampleTested with
Devices(s): Nokia 5800 XpressMusic,Nokia N97, Nokia E72, Nokia N8
Compatibility
Platform(s): Qt (tested Qt 4.7 Symbian^3)
Symbian
Article
Keywords: QNetworkAccessManager,QNetworkReply,QNetworkRequest,QUrl
Created: gaba88 (25 Mar 2010)
Last edited: hamishwillee (11 Oct 2012)


Contents

[edit] Overview

This article is a basic QWidget application which performs HTTP GET and POST for a user specified URL.

This is a very basic article this can be extended to suite the developers need. Note that it can only be used in portrait mode - it does not scale properly when rotated.

[edit] Prerequisite

[edit] capability required

  • NetworkServices

[edit] UI design (.ui file)

The below screenshot shows the ui design file.

QtGetPost3.JPG

[edit] 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

[edit] 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);
 
}

[edit] Output Screenshots

  • Initial Screen Asking the user to select and http get or post.


QtGetPost1.jpg

  • Screenshot after user has clicked the get button.


QtGetPost2.jpg

  • Screenshot after user has clicked the post button.


QtGetPost4.jpg


[edit] Sample Application


[edit] Reference Links

This page was last modified on 11 October 2012, at 04:17.
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