Qt/C++ Programming
Ankur Gupta

What is this cutey thing ??
Qt is a cross-platform C++ GUI toolkit.
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It also comes along with
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An extensive C++ class library of over 400 classes
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GUI, Database, Core, XML, Networking, Open GL,
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Multithreading, and more
Advanced cross-platform development tools for:
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GUI layout and forms design
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Internationalization
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Documentation
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QT Cross Platform How-To
Qt builds directly on the OS graphics layer
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Qt applications are native, compiled executables
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Result:
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High performance, memory-efficient applications with native
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look and feel

So who uses QT ?
Skype, K Desktop Environment, Adobe Photo Album, Google Earth.

Rapid Application Development
• Qt Designer is a powerful, drag-and-drop GUI layout and forms builder
Features
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Supports forms and dialog creation with instant preview
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Integrates with Qt layout system
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Extensive collection of standard widgets
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Support for custom widgets and dialogs
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Seamless integration with Microsoft® Visual Studio .NET
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Benefits
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Greatly speeds the interface design process
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Enables native look and feel across all supported platforms
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Developers work within the environment of their choice, leveraging existing skills
–

VB anyone ;-)

what you drag is what you get

Talk is cheap - Show me the code
#ifndef HELLO_WORLD_H_H
#define HELLO_WORLD_H_H
#include <QApplication>
#include <QLabel>
int main(int argc, char **argv)
{
QApplication helloWorldApp(argc,
argv);
QLabel aLabel("Hello Barcamp", 0);
aLabel.show();
return helloWorldApp.exec();
}
#endif
/*
Compilation Steps
1. qmake -project
2. qmake projectfile.pro
3. make
The executable/binary will be created
*/

Talk is cheap - Show me the code
QApplication helloWorldApp(argc, argv);
QWidget *aWidget = new QWidget;
QPushButton *aPushButton = new QPushButton("Click
Me", aWidget);
QMessageBox *aPopup = new
QMessageBox("Barcamp",
"From QT to Barcamp.
Howdy ...
Having Fun ...",
QMessageBox::Question,
QMessageBox::Yes |
QMessageBox::Default,
QMessageBox::No |
QMessageBox::Escape,
QMessageBox::NoButton);
QObject::connect(aPushButton, SIGNAL(clicked()),
aPopup, SLOT(exec()));
aWidget->show();
return helloWorldApp.exec();

Signal and Slot – Callbacks
Signals and slots are used for communication between objects
A signal is emitted when a particular event occurs.
A slot is a function that is called in response to a particular
signal.

Ok I am sold on this cutey thing
How do I get started ?
• Qt Assistant is a fully customizable,
redistributable help file/documentation browser
Features
●
Simple, web-browser-like navigation,
–
bookmarking and linking of documentation
files
Support for rich text and HTML
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Full text and keyword lookup
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Can be customized and shipped with Qt
–
applications
Benefits
●
No longer have to build a help system from
–
scratch
Leverage existing HTML skills
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Deliver documentation in an easily searchable
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and navigable format to your end users
• http://trolltech.com ( The Company behind QT )
• http://qtcenter.org ( QT Help Forum )

Yet another library management software

Wake up its over
?
Questions