File Handling In C++

SYLLABUS OUTLINE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SYLLABUS OUTLINE (Contd.)

[object Object],Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Files (Streams) ,[object Object],Lets put it in points…………..

Why use files? ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

I/O in C++ ,[object Object],[object Object],[object Object]

Flow of Data…. PROGRAM DEVICES OR FILES Input Stream >> Output Stream << Data Data istream class ostream class (Insertion operator)‏ (Extraction operator)‏

More About Files….. ,[object Object],[object Object],[object Object],[object Object],[object Object]

I/O in C++ ,[object Object],[object Object],[object Object],[object Object]

The following classes in C++ have access to file input and output functions: ,[object Object],[object Object],[object Object],File Related Classes

The Stream Class Hierarchy ios istream get()‏ getline()‏ read()‏ >> ostream put()‏ write()‏ << fstreambase iostream Ifstream Open()‏ Tellg()‏ Seekg()‏ Ofstream Open()‏ Tellp()‏ Seekp()‏ fstream NOTE : UPWARD ARROWS INDICATE THE BASE CLASS

OPENING A FILE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Associating a stream with a file)‏

File Mode Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The mode can combine two or more modes using bit wise or ( | )

Checking For Successful File Opening ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closing of File ,[object Object],[object Object],[object Object],[object Object]

Types of Files ,[object Object],[object Object],[object Object],[object Object]

Text Files ,[object Object],[object Object]

[object Object],[object Object],Binary Files

[object Object],[object Object],[object Object],Binary Files

[object Object],[object Object],[object Object],[object Object],Text Files Binary Files

[object Object],[object Object],[object Object],[object Object],The programs to create the data files will differ in how they open the file and in how they write to the file.

: Sequential access . With this type of file access one must read the data in order, much like with a tape, whether the data is really stored on tape or not. Random access (or direct access ). This type of file access lets you jump to any location in the file, then to any other, etc., all in a reasonable amount of time. ,[object Object]

FILE POINTERS ,[object Object],[object Object],[object Object],[object Object]

File pointers….. ,[object Object],[object Object],[object Object]

Functions associated with file pointers : ,[object Object],[object Object]

seekg() function : (with one argument) ,[object Object],[object Object],[object Object],[object Object],[object Object],Begin File End k bytes ^ File pointer

‘ seek’ functions : ( With two arguments ) Number of bytes file pointer to be moved Location from where File pointer is to be moved fl.seekg(offset, refposition); fl.seekp(offset, refposition); Refposition takes one of the following forms : ,[object Object],[object Object],[object Object]

File Pointer offset calls ,[object Object],[object Object],[object Object],[object Object]

File Pointer offset calls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

seekg() function : ( With two arguments ) : Go backward by m bytes from the end m bytes fl.seekg(m,ios::cur); Go forward by m bytes from current pos ,[object Object],Move to (m+1)th byte in the file m bytes Begin End End Begin m bytes Begin End ^ Offset from Begin ^ Offset from current position ^ Offset from end fl.seekg(-m,ios::cur);

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],clrscr(); ifstream infl; getch(); cout <<"reading from created file "; infl.open("try.txt"); out.open("cod.dat"); //********************************** c=infl.get(); do { d=c+1; cout<<c<<d<<''; out.put(d); c= infl.get(); } while (c!=''); out<<''; infl.close(); outfl.close(); getch(); //********************************* } Program to generate coded file…… (Text File)

File Handling In C++

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File Handling In C++