TAILIEUCHUNG - Object Oriented Programming (30)

CSC241: Object Oriented Programming. Lecture No 32. 1 Previous Lecture.• Stream and classes. •. Input and Output stream. •. iostream class. •. ios class. – Formatting Flags. – Error-Status Bits. – Formatted File I/O. ». Reading data. ». Writing data 2 Today’s Lecture.• File operations.• Formatted File I/O. •. Reading data. •. Writing data. •. Character I/O.• Binary I/O.• Object I/O 3 Character I/O.•. put() and get() functions, can be used to output. and input single characters.•. These are member of ostream and istream,. respectively. Go to. program.•. Another way is to use rdbuf() function. ifstream infile(“”);. cout (buff),.MAX*sizeof(int) );.•. Opening file in read mode. ifstream is(“”, ios::binary);.•. Reading whole array in buff from is ( reinterpret_cast(buff),.MAX*sizeof(int) ); 6 reinterpret_cast operator.•. It is used to make it possible for a buffer of type. int to look to the read() and write() functions like. a buffer of type char.•. It changes the type of a section of memory. Go to. program. 7 Object I/O.•. An object’s values can be written in and read. back from a file.•. Generally binary mode is use for Object I/O. – This writes the same bit configuration to disk that was. stored in memory, and. – ensures that numerical data contained in objects is. handled properly.•. Example program. – Input value from user in an object of class person. – writes this object to the disk file. 8 Writing/reading an Object to person {. protected:. char name[40];. int age;. public:. void getData() {. cout >. Go ;. program. cout > age;. }.};.main() {. person pers;. ();. ofstream outfile(“”, ios::binary);. (reinterpret_cast(&pers),.sizeof(pers)); 9 Compatible Data Structures.•. Reading and writing object can. – belong to same class of objects. – or if classes are different then they must have same. data members (without virtual functions).•. Person class object occupy 40 + 4 = 44 bytes.•. Make sure a class used to read an object is. identical to the class used to write it•. Also do not attempt disk I/O with objects

• Sáng kiến kinh nghiệm
• Object Oriented Programming
• Object Initializatio
• Usage Acquaint
• Data initialization
• Object usage
• Object declaration
• Programming languages
• Lecture Object oriented programming
• Lập trình hướng đối tượng
• Object oriented programming with Java
• Object oriented programming in C++
• Software object
• Bài giảng Lập trình hướng đối tượng
• Architectural models
• Mechanical models
• Tangible object
• Lesson Object
• Unified inheritance hierarchy
• Access through Object reference
• Unique Type object
• Simple type string conversion
• Automatic use of ToString
• Bài giảng Photoshop
• Làm việc với Smart Object
• Cách sử dụng Filter
• Cách mở tấm hình dưới dạng Smart Object
• Chỉnh sửa đối tượng Smart Object
• Làm việc với các filter
• Object Oriented Data Modeling
• Data Modeling
• UML Language
• Object Oriented Modeling
• Object Modeling Example
• Tranform Class Diagram to Relational Database Schema
• Programming language
• Java programming language
• Sample object returning method
• Overloaded methods
• JFileChooser object
• Primitive data types
• String Tokenizer object
• Abstract classes
• Java program
• Object serialization
• Data hierarchy
• Sequential access text files
• Object oriented software engineering
• Software engineering
• Practical software development
• Object orientation
• Modeling with classes
• Object diagrams
• Inheritance hierarchies
• Variable declarations
• Object detection
• Recognition in digital images
• Object detection and tracking
• Object recognition
• Template based recognition
• Object Oriented Programing
• Lecture Object Oriented Programing
• Direct superclass
• Indirect superclass
• Effect polymorphism
• Demonstrating polymorphic behavior
• Class file
• Instance data values
• Class data value
• Software development
• C++ programming