Wt example 1 is a Wt example to code and display a simple menu.

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Operating system(s) or programming environment(s)

Ubuntu 10.10 (maverick)

IDE(s):

Qt Creator 2.0.0

Project type:

Console application

Compiler(s):

G++ 4.4.5

Libraries used:

STL: GNU ISO C++ Library, version 4.4.5
Wt: version 3.1.2

Qt project file: CppWtMenu.pro


#-------------------------------------------------

#

# Project created by QtCreator 2010-12-14T12:41:04

#

#-------------------------------------------------

QT       += core

QT       -= gui

LIBS += -lwt -lwthttp

QMAKE_CXXFLAGS += -DNDEBUG

TARGET = CppWtMenu

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp \

    menuapplication.cpp \

    menuwidget.cpp

HEADERS += \

    menuapplication.h \

    menuwidget.h

main.cpp


//---------------------------------------------------------------------------

#include <Wt/WApplication>

#include "menuapplication.h"

//---------------------------------------------------------------------------

Wt::WApplication *createApplication(

  const Wt::WEnvironment& env)

{

  return new MenuApplication(env);

}

//---------------------------------------------------------------------------

int main(int argc, char **argv)

{

  return WRun(argc, argv, &createApplication);

}

//---------------------------------------------------------------------------

menuapplication.cpp


#include "menuapplication.h"

#include "menuwidget.h"

//---------------------------------------------------------------------------

MenuApplication::MenuApplication(const Wt::WEnvironment& env)

  : Wt::WApplication(env),

    m_menu(new MenuWidget)

{

  this->setTitle(__TIME__);

  root()->addWidget(m_menu);

}

//---------------------------------------------------------------------------

menuapplication.h


#ifndef MENUAPPLICATION_H

#define MENUAPPLICATION_H

//---------------------------------------------------------------------------

#include <Wt/WApplication>

//---------------------------------------------------------------------------

struct MenuWidget;

//---------------------------------------------------------------------------

struct MenuApplication : public Wt::WApplication

{

  MenuApplication(const Wt::WEnvironment& env);

  private:

  //All pointers are managed by Wt

  MenuWidget * const m_menu;

};

//---------------------------------------------------------------------------

#endif // MENUAPPLICATION_H

menuwidget.cpp


//---------------------------------------------------------------------------

#include <ctime>

#include <string>

//---------------------------------------------------------------------------

#include <Wt/WPushButton>

#include <Wt/WVBoxLayout>

#include "menuwidget.h"

//---------------------------------------------------------------------------

MenuWidget::MenuWidget()

  : m_button1(new Wt::WPushButton),

    m_button2(new Wt::WPushButton),

    m_button3(new Wt::WPushButton),

    m_layout(new Wt::WVBoxLayout(this))

{

  m_layout->setContentsMargins(0,0,0,0);

  m_layout->setSpacing(0);

  m_layout->addWidget(m_button1);

  m_layout->addWidget(m_button2);

  m_layout->addWidget(m_button3);



  m_button1->setText("Button one");

  m_button2->setText("Button two");

  m_button3->setText("Button three");



  this->resize(200,Wt::WLength::Auto);



  m_button1->clicked().connect(this, &MenuWidget::onButton1Click);

  m_button2->clicked().connect(this, &MenuWidget::onButton2Click);

  m_button3->clicked().connect(this, &MenuWidget::onButton3Click);

}

//---------------------------------------------------------------------------

void MenuWidget::onButton1Click()

{

  m_button1->setText( GetTime() );

}

//---------------------------------------------------------------------------

void MenuWidget::onButton2Click()

{

  m_button2->setText( GetTime() );

}

//---------------------------------------------------------------------------

void MenuWidget::onButton3Click()

{

  m_button3->setText( GetTime() );

}

//---------------------------------------------------------------------------

///TimeToStr converts std::time_t to std::string.

///From http://www.richelbilderbeek.nl/CppTimeToStr.htm

const std::string TimeToStr(const std::time_t& time)

{

  return std::ctime( &time);

}

//---------------------------------------------------------------------------

//From http://www.richelbilderbeek.nl/CppGetTime.htm

std::time_t GetTimeT()

{

  return std::time(0);

}

//---------------------------------------------------------------------------

//From http://www.richelbilderbeek.nl/CppGetTime.htm

const std::string GetTime()

{

  return TimeToStr(GetTimeT());

}

//---------------------------------------------------------------------------

menuwidget.h


#ifndef MENUWIDGET_H

#define MENUWIDGET_H

//---------------------------------------------------------------------------

#include <Wt/WContainerWidget>

//---------------------------------------------------------------------------

namespace Wt

{

  struct WPushButton;

  struct WVBoxLayout;

};

//---------------------------------------------------------------------------

struct MenuWidget : public Wt::WContainerWidget

{

  MenuWidget();



  private:

  //All pointers are managed by Wt

  Wt::WPushButton * const m_button1;

  Wt::WPushButton * const m_button2;

  Wt::WPushButton * const m_button3;

  Wt::WVBoxLayout * const m_layout;



  private slots:

  void onButton1Click();

  void onButton2Click();

  void onButton3Click();

};

//---------------------------------------------------------------------------

//From http://www.richelbilderbeek.nl/CppGetTime.htm

const std::string GetTime();

//---------------------------------------------------------------------------

#endif // MENUWIDGET_H

Additional preparations

Added the following arguments to the Run Settings:


--docroot . --http-address 0.0.0.0 --http-port 8080

Deploying the Wt application locally

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/CppWtExample1-build-desktop/CppWtExample1')"

[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:


http://127.0.0.1:8080/

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.

(C++) Wt example 1