File Processing

File Processing

Buffer area is part of the memory used as a tempoarary space before data moved to a file.

Syntax :
File *fp
where fp is a file pointer pointing to the start of the buffer area.

Open File

Opening a File using fopen()
fp=fopen(const char *filename, const char *mode);
Possible Mode value:
“r” : opening a file to be read.
“w” : creating a file to be written.
“a” : opening a file for data append.
“r+” : opening a file for read/write.
“w+” : creating file for read/write
“a+” : opening a file for read/append.
“rb” : opening a file (binary) to be read.
“wb” : creating a file(binary for write operation.

Close file
Closing a file using fclose():
int fclose(File *stream);

Input & Output File

1.     Fwrite

-        Syntax : size_t fwrite(const void *buffer, size_t size, size_t count, FILE *stream);

-        Writing a block of data in the buffer area to the file

-        Return number of byte data written, and error otherwise.

2.     Fread

-        Syntax : size_t fread( void * buffer, size_t size, size_t count, File *stream);

-        Read a block size of data from a file

3.     Fscanf

-        Syntax : int fscanf(File * stream, const char *format[,argument]…);

-        Read data from file inline with the scanf formatting.

-        Return the number of field read while successful, and EOF if error

4.     Fprintf

-        Syntax : int fprintf(File *stream, const char*format[,argument]…);

-        Writing data to a file using the printf format.

-        Return number of byte written if successful and negative value if error.

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