Qt is a cross-platform application framework for graphical user interfaces. It was first released in 1995 and has since had major releases in 1998, 2002, 2005, and 2012. Notable customers include Nokia, who purchased the company behind Qt in 2008. Qt can be used commercially under the LGPL license or a commercial license. It uses signals and slots for communication between objects and integrates with compilers and tools like moc, uic, and rcc to support its features while working with standard C++.

1. Qt basics

2. Qt History
• 1994 Trollthech was founded
• 1995 First release of Qt
• 1998 release of Qt2
• 2002 release of Qt3
• Summer 2005 release of Qt4
• 2008 Nokia purchases Trollthech
• November 2012 release of Qt5

3. Qt well known customers

4. Qt Licensing
• LGPL v2.1
 Can be used in commercial apps with closed
code
Code changes in libraries must be shared
• Commercial version
Code changes in libraries don’t have to be shared
Customer support

5. Qt Architecture

6. Qt and Visual Studio
+
• QtVsAddin
• Reqirements

7. Qt and C++
• Qt goes beyond C++
Seamless objects communication(signals and
slots)
Meta Object system(Object Properties, and object
trees)
• Still works with standard C++ compilers on all
supported platforms

8. Qt additional compiling steps
• moc(Meta-Object compiler)
• uic(User Interface compiler)
• rcc(Resources compiler)

9. Signals and Slots
• Signal
Emited when paticular event occurs
Can be used from existing classes and create your
own
• Slots
Function which response to signal
Can also create your own

10. Signals and Slots
• Requirements
QObject inheritance
Q_OBJECT macro
signals, slots section
connect, disconnect methods
• Connection types
Direct, Queued, Unique

11. Signals and Slots

12. Additional tools
• Qt Designer
• Qt Linguist
• Qt Assistant

13. Questions?