(C++) HelloWtQtCreatorUbuntu

 

Technical facts

 

Application type(s)

• Web application

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.9.2

Libraries used:

• Boost: version 1.55
• Qt: version 5.4.1 (32 bit)
• STL: GNU ISO C++ Library, version 4.9.2
• Wt: version 3.3.3

 

 

 

 

 

Qt project file: ./CppHelloWtQtCreatorUbuntu/CppHelloWtQtCreatorUbuntu.pro

 

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QT       += core QT       -= gui LIBS += -lwt -lwthttp -lboost_signals QMAKE_CXXFLAGS += -DNDEBUG CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app SOURCES += main.cpp

 

 

 

 

 

./CppHelloWtQtCreatorUbuntu/main.cpp

 

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/* * Copyright 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 member function 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); }