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Hello Wt application using Qt Creator
under Ubuntu.
This program is used as a base for some examples:
IDE(s):
Project type:
GUI application
Compiler(s):
Libraries used:
Boost: version 1.42
Qt: version 4.7.0 (32 bit)
STL: GNU ISO C++ Library, version 4.4.5
Wt: version 3.1.2
#-------------------------------------------------
#
# Project created by QtCreator 2010-11-18T12:10:20
#
#-------------------------------------------------
QT += core
QT -= gui
TARGET = CppHelloWtQtCreatorUbuntu
LIBS += -L/usr/lib -lwt -lwthttp
QMAKE_CXXFLAGS += -DNDEBUG
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
|
main.cpp
/*
* Copyright (C) 2008 Emweb bvba, Heverlee, Belgium.
*
* See the LICENSE file for terms of use.
*/
#include <Wt/WApplication>
#include <Wt/WBreak>
#include <Wt/WContainerWidget>
#include <Wt/WLineEdit>
#include <Wt/WPushButton>
#include <Wt/WText>
#include <boost/version.hpp>
using namespace Wt;
/*
* A simple hello world application class which demonstrates how to react
* to events, read input, and give feed-back.
*/
class HelloApplication : public WApplication
{
public:
HelloApplication(const WEnvironment& env);
private:
WLineEdit *nameEdit_;
WText *greeting_;
void greet();
};
/*
* The env argument contains information about the new session, and
* the initial request. It must be passed to the WApplication
* constructor so it is typically also an argument for your custom
* application constructor.
*/
HelloApplication::HelloApplication(const WEnvironment& env)
: WApplication(env)
{
setTitle("Hello world"); // application title
root()->addWidget(new WText("Your name, please ? ")); // show some text
nameEdit_ = new WLineEdit(root()); // allow text input
nameEdit_->setFocus(); // give focus
WPushButton *b = new WPushButton("Greet me.", root()); // create a button
b->setMargin(5, Left); // add 5 pixels margin
root()->addWidget(new WBreak()); // insert a line break
greeting_ = new WText(root()); // empty text
/*
* Connect signals with slots
*
* - simple Wt-way
*/
b->clicked().connect(this, &HelloApplication::greet);
/*
* - using an arbitrary function object (binding values with boost::bind())
*/
nameEdit_->enterPressed().connect
(boost::bind(&HelloApplication::greet, this));
}
void HelloApplication::greet()
{
/*
* Update the text, using text input into the nameEdit_ field.
*/
greeting_->setText("Hello there, " + nameEdit_->text());
}
WApplication *createApplication(const WEnvironment& env)
{
/*
* You could read information from the environment to decide whether
* the user has permission to start a new application
*/
return new HelloApplication(env);
}
int main(int argc, char **argv)
{
/*
* Your main method may set up some shared resources, but should then
* start the server application (FastCGI or httpd) that starts listening
* for requests, and handles all of the application life cycles.
*
* The last argument to WRun specifies the function that will instantiate
* new application objects. That function is executed when a new user surfs
* to the Wt application, and after the library has negotiated browser
* support. The function should return a newly instantiated application
* object.
*/
return WRun(argc, argv, &createApplication);
}
|
Additional preparations
Added the following arguments to the Run Settings:
--docroot . --http-address 0.0.0.0 --http-port 8080
|
When running the program (from Qt Creator) you will see the following application output, indicating that
the program works fine:
[2010-Nov-19 16:41:38.365920] 6360 - [notice] "Wt: initializing built-in httpd"
[2010-Nov-19 16:41:38.366043] 6360 - [notice] "Reading Wt config file: /etc/wt/wt_config.xml (location = '/home/richel/qtsdk-2010.04/bin/Projects/Website/CppHelloWtQtCreatorUbuntu-build-desktop/CppHelloWtQtCreatorUbuntu')"
[2010-Nov-19 16:41:38.366592] 6360 - [notice] "Started server: http://0.0.0.0:8080"
|
Now, start your web browser and go to the following address:
You will see the 'Hello Wt' dynamic website. You just
deployed your Wt application locally. This is just fine for debugging.
If the application is ready to be put on the web,
deploy the Wt application globally.
Go back to Richel Bilderbeek's C++ page.
Go back to Richel Bilderbeek's homepage.
Ubuntu 10.10 (maverick)
Qt Creator 2.0.0 