Hi
These are my notes.
1st they were done last year (didn't manage to write the exam), I may have used notes from someone else as a base.
2nd I take no responsibility for their accuracy.
3rd If you make any changes please post them here so that I can add them, and everyone else can benefit.
4th Leave a note if you feel they are good/bad, just so that I know I'm not leading everyone down the garden path.
PDF (For people without OO)
http://rapidshare.com/files/308186341/cos.v1.pdf
http://go.greenlight.co.za/wp-content/uploads/2009/11/cosv1.pdf (Only for people having trouble with Rapidshare, PLEASE)
OpenOffice (So that you can make changes)
http://rapidshare.com/files/308187968/cos.v1.odt
http://go.greenlight.co.za/wp-content/uploads/2009/11/cosv1.odt (Only for people having trouble with Rapidshare, PLEASE)
Notes from ShaunGVW
http://go.greenlight.co.za/wp-content/uploads/2009/11/qt_cppnotes.doc Qt and C++ Notes
http://go.greenlight.co.za/wp-content/uploads/2009/11/design_patterns.doc Design Patterns
I'm looking for notes on INF320 for the current edition of the book. Anyone got? email me rey (at) xhuma (dot) co (dot) za
Some review questions from
http://cartan.cas.suffolk.edu/oopdocbook/opensource/main.html .From the book.
As for the Exam 2008 thread from Shawn. If I get time during the week I'll make some answers. Please feel free to PM me or add answers to the thread.
Chapter 3:
1.What is a project file? How can you produce one for your project?
2.What does the TEMPLATE variable mean in the qmake project file? What are possible values?
3.What is a Makefile? How can you produce a Makefile for your project?
Chapter 7:
1.For each of these items, decide whether it would normally be found in a header (.h) file or an implementation (.cpp) file and explain why.
1.function definitions
2.function declarations
3.static object declarations
4.static object definitions
5.class definitions
6.class declarations
7.inline function definitions
8.inline function declarations
9.default argument specifiers
2. What is the difference between a compile time dependency and a link time dependency?
Chapter 8:
1.What is a design pattern? What do most design patterns have in common?
2.What Qt classes use the Visitor pattern? Explain why.
3.Why does the FileVisitor need to be recursive?
4.There are three kinds of design patterns: structural, creational, and behavioral. Which kind is the Visitor? Why?
1. Are efficient and elegant solutions to common problems in object-oriented software design. They are high-level abstract templates that can be applied to particular kinds of design problems.
2. QDir and QFileInfo
3. As it needs to search directories recursively till it finds all files
4. Behavioral - Why?
Chapter 9:
1.What does it mean when QObject A is the parent of QObject B?
2.Which QObjects do not need a parent?
3.What happens to a QObject when it is reparented?
4.Why is the copy constructor of QObject not public?
5.What is the composite pattern?
6.How can QObject be both composite and component?
7.How can you access the children of a QObject?
8.What is an event loop? How is it initiated?
9.What is a signal? How do you call one?
10.What is a slot? How do you call one?
11.How are signals and slots connected?
12.In the case where multiple signals are connected to the same slot, how can you determine the QObject that emitted the signal?
13.How can information be transmitted from one object to another?
14.Deriving a class from QObject more than once can cause problems. How might that happen accidentally?
15.What is the difference between value types and object types? Give examples.
1. QObject B is contained or managed at run-time by QObject A.
2.
3. It is relinked to a different parent.
4. As all QObject are unique and must stay that way.
5. According to [Gamma95], the composite pattern is intended to facilitate building complex (composite) objects from simpler (component) parts by representing the part-whole hierarchies as tree-like structures
6.
7. QObject has a function called findChildren()
8. An event loop is a program structure that permits events to be prioritized, enqueued, and dispatched to objects. (QApplication).exec()
9. A signal is a message that is presented in a class definition like void function declaration. It has a parameter list but no function body. It must be emitted, and can't be called. It's part of the class interface.
10. A Slot is a void member function. It can be called as normal.
11. QObject::connect(quitButton, SIGNAL(clicked()),qApp, SLOT(quite()))
12. They are queued or executed in an asynchronous way, depending on the optional Qt::ConnectionType passed to connect()
13. Through the argument list of the signals and slots.
14. By not wrapping the header in a "#ifndef"
15. Value types are simple "Anything*, int, char, QString, QDate, and QVariant. Object types are more complex i.e QObject
Chapter 10:
1.Explain an important difference between a template parameter and a function parameter.
2.What does it mean to instantiate a template function? Describe one way to do this.
3.Normally, you need to place template definitions in header files. Why is this?
4.Some compilers support export. What is it for?
5.Qt's container classes are used to collect value types. What kinds of things are not appropriate to store by value in a value collection?
6.Which containers provide a mappings from key to value? List and describe at least two, and tell how they are different from each other.
7.What does it mean for a container to “manage†its heap objects? How can a container of pointers to heap objects become a “managed container�
8.Give at least 3 examples of Qt classes that implement the Flyweight pattern.
1. A Template parameter differs from a function parameter in that it can be used to pass not only variables and values, but also type expressions
2. Each time the compiler see a template used for the FIRST time it is instantiated and all further calls are may into ordinary function calls
3. This is necessary for the compiler to generated code from a template declaration
4.
5. Heap Object so as to avoid memory leaks as value containers don't manage their objects
6. QMap, QHash,QMultiMap, QCache, QSet Page (220)
7. Managed heap objects are destroyed by it's parent Object when it's that Object is destroyed
8.
Chapter 11:
1.List six things that QWidgets have in common.
2.How can you save and later restore the size, position, and arrangements of widgets for a GUI app?
3.Why would you want to do such a thing?
4.What is a dialog? Where is an appropriate place to use it?
5.What is a QLayout? What is its purpose? What is an example of a concrete QLayout class?
6.Can a widget be a child of a layout?
7.Can a layout be a child of a widget?
8.What are the advantages of listing our images in a resources file?
9.What is the difference between a spacer and a stretch?
10.What is a QAction? How are actions triggered?
11.It is possible to create QMenus without using QActions. What are the advantages of using a QAction?
12.Which Qt classes use the Command pattern?
1.
2. The class QSettings can be used
3. To save the application settings across executions
4. Is a pop up box that can be used to get a user response and should only be used for obtaining and communicating important information
5. QLayout is a and abstract class. To organize the space occupied by widgets. QBoxLayout
6. Yes
7. Yes
8. They can be addressed using paths that do not depend on the local file system, and the can "move" with the executable. Also making the project more robust.
9. Spacer is a fixed size, Stretcher can size itself as requested
10. A QAction is a QObject that is a base class for user-selected actions. Clicks on a menu, short-cut key or clicks on a toolbar.
11.
12.
Chapter 12:
1.What are two important differences between a process and a thread?
2.List and explain at least two mechanisms by which a parent process communicates information to its child process.
3.List and explain at least two mechanisms by which threads synchronize with each other.
4.In what situations can a QTimer be used instead of a QThread? Why would one want to do that?
5.What does it mean for an object to be thread-safe?
1. Process runs in a separate memory space, communicate with streams and is managed by the OS. Threads share memory with other threads and are managed by the Parent process.
2. stdout and stderr. setReadChannel() and readyReadStandardOutput() is emitted. read(), readLine(),getChar() and write().
Enviroment variables. QProcess::enviroment()
3. Synchronize using locks, wait conditions, mutexes, semaphores
4. When a simple repetitive task needs to be completed, such as a simple animation.
5. When an object is one that can be accessed concurrently by multiple threads and is guaranteed to always be in a "valid" state
Chapter 13:
1.What is a regular expression? What can you use it for?
2.What is a validator? What is it used for?
3.What is a regular expression meta-character? There are four kinds of metacharacters - quantifier, character set, group, and anchor. Give examples of each type and explain what they mean.
1. Are used for validating input, for extracting data from input, and for searching and replacing
2. Validators are non-visual objects that are attached to input widgets to provide a general framework for checking user input.
3. A meta-character is a character that describes other characters. Quantifier - +, ?, * Character Set - \s , \S, \d, \D Group - [1..9] Anchor - ^, $
Chapter 14:
1.If there is a syntax error in your XML file, how do you determine the cause and location?
2.SAX is an event-driven parser. What kinds of events does it respond to?
3.Qt (as well as other language frameworks) offers two XML parser APIs, one is SAX and the other is DOM. Compare and contrast them. Why would you use one rather than the other?
4.If you have a QDomNode and it is actually “pointing†to a QDomElement, how do you get a reference to the QDomElement?
5.Explain how DomWalker is an application of the Visitor pattern.
1.
2. It responds when it encounters various elements of the XML file during parsing. Start, End of document and tags and characters
3. DOM requires the entire document to be loaded into memory. SAX process data while parsing the file.
4. "Downcast" from QDomNode to QDomElement
5. As it traverses the XML tree and has an overridden visit() function that transforms each node.
Chapter 15:
1.What is an anti-pattern? Give two examples.
2.How do you determine the number of properties defined in a QObject?
3.What Qt classes are used to do data reflection? Explain why.
4.How does the QMetaObject code for each of your QObject-derived classes get generated?
5.What is a downcast? In what situations do we use them?
6.What is the Prototype pattern? Describe an example of it.
7.What are the advantages of defining properties over regular getters and setters?
8.What does the property() function return? How do we obtain the actual stored value?
1. A common design pitfall. Copy and paste, Hard Coding, Interface Bloat, Re-inventing the wheel, and God Object.
2. methodCount()
3. QMetaObject, QMetaProperty
4. moc generates it
5. In situations where you have base class pointers to derived class objects, down-casting makes it possible to call derived class methods that do not exist in the base class interface
6.
7.
8. Returns the value of the object's named property. QVariant QObject::property ( const char * name )
Chapter 16:
1.How can a creational pattern help manage object destruction?
2.How can properties help us write a more general-purpose Writer?
3.How can an Abstract Factory help us write a more general-purpose Reader?
4.What is auto_ptr used for?
5.What is special about assignment between auto_ptr objects?
6.We can create a FormModel class in a number of ways. One approach is to create Question objects directly and add them. Another way is to create a FormModel from a DataObject. Why would we use one technique instead of the other?
7.What Qt classes are implementations of the Façade pattern? Explain why they are facades or wrappers.
1. Any object created by or child of another object is destroyed when it's parent is destroyed.
2.
3.
4. Pointer memory management
5. The assigning pointer becomes NULL and the assigned pointer takes on the new value. i.e. Only one auto_ptr will ever point to an Object
6.
7.
Chapter 17:
1.What is controller code? Which Qt classes are controller classes?
2.What pattern(s) is/are used in the design of InputField?
3.Because there is a 1:1 correspondence between InputField and Question, we could easily combine the two classes into one. What would you call that class? Explain the advantages or disadvantages of this design.
4.Why is it recommended to use the QStandardItemModel instead of the QTreeWidgetItem?
5.How do you determine what item(s) is/are selected in a QListView?
6.If we wanted to iterate through items in an QAbstractItemModel, what would be a good class to use?
7.There are two distinct model-view class pairs for storing and displaying tree-like data. What are they called? Why would you use one versus the other?
1. Controller code is code that manages the interactions among events, models, and views. QApplication, QAction
2.
3.
4.
5.
6.
7. QAbstractItemModel,QTreeView and QTreeWidgetItem, QTreeWidget
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"Flying is learning how to throw yourself at the ground and miss." - Douglas Adams
"Time is a great teacher, but unfortunately it kills all its pupils ..." - Louis Hector Berlioz
I think animal testing is a terrible idea; they get all nervous and give the wrong answers.
