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#include <cstdio> int ferror(FILE *stream);
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The ferror( ) function checks for a file error on the given stream A return value of zero indicates that no error has occurred, while a nonzero value means an error
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C++: The Complete Reference
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To determine the exact nature of the error, use the perror( ) function Related functions are clearerr( ), feof( ), and perror( )
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#include <cstdio> int fflush(FILE *stream);
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If stream is associated with a file opened for writing, a call to fflush( ) causes the contents of the output buffer to be physically written to the file The file remains open A return value of zero indicates success; EOF indicates that a write error has occurred All buffers are automatically flushed upon normal termination of the program or when they are full Also, closing a file flushes its buffer Related functions are fclose( ), fopen( ), fread( ), fwrite( ), getc( ), and putc( )
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#include <cstdio> int fgetc(FILE *stream);
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The fgetc( ) function returns the next character from the input stream from the current position and increments the file position indicator The character is read as an unsigned char that is converted to an integer If the end of the file is reached, fgetc( ) returns EOF However, since EOF is a valid integer value, when working with binary files you must use feof( ) to check for the end of the file If fgetc( ) encounters an error, EOF is also returned If working with binary files, you must use ferror( ) to check for file errors Related functions are fputc( ), getc( ), putc( ), and fopen( )
fgetpos
#include <cstdio> int fgetpos(FILE *stream, fpos_t *position);
25:
The C-Based I/O Functions
The fgetpos( ) function stores the current value of the file position indicator in the object pointed to by position The object pointed to by position must be of type fpos_t The value stored there is useful only in a subsequent call to fsetpos( ) If an error occurs, fgetpos( ) returns nonzero; otherwise it returns zero Related functions are fsetpos( ), fseek( ), and ftell( )
fgets
#include <cstdio> char *fgets(char *str, int num, FILE *stream);
The fgets( ) function reads up to num-1 characters from stream and places them into the character array pointed to by str Characters are read until either a newline or an EOF is received or until the specified limit is reached After the characters have been read, a null is placed in the array immediately after the last character read A newline character will be retained and will be part of the array pointed to by str If successful, fgets( ) returns str; a null pointer is returned upon failure If a read error occurs, the contents of the array pointed to by str are indeterminate Because a null pointer will be returned when either an error has occurred or when the end of the file is reached, you should use feof( ) or ferror( ) to determine what has actually happened Related functions are fputs( ), fgetc( ), gets( ), and puts( )
THE STANDARD FUNCTION LIBRARY
fopen
#include <cstdio> FILE *fopen(const char *fname, const char *mode);
The fopen( ) function opens a file whose name is pointed to by fname and returns the stream that is associated with it The type of operations that will be allowed on the file are defined by the value of mode The legal values for mode are shown in Table 25-1 The filename must be a string of characters comprising a valid filename as defined by the operating system and may include a path specification if the environment supports it If fopen( ) is successful in opening the specified file, a FILE pointer is returned If the file cannot be opened, a null pointer is returned
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