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Standard library header <cstdio>

This header was originally in the C standard library as <stdio.h>.

This header is part of the C-style input/output library.

Types

FILE type, capable of holding all information needed to control a C I/O stream
fpos_t type, capable of uniquely specifying a position in a file
unsigned integer type returned by the sizeof operator
(typedef)

Macros

 implementation-defined null pointer constant
(macro constant)
stdinstdoutstderr
 expression of type FILE* associated with the input stream
expression of type FILE* associated with the output stream
expression of type FILE* associated with the error output stream
(macro constant)
EOF
 integer constant expression of type int and negative value
(macro constant)
FOPEN_MAX
 number of files that can be open simultaneously
(macro constant)
FILENAME_MAX
 size needed for an array of char to hold the longest supported file name
(macro constant)
BUFSIZ
 size of the buffer used by std::setbuf
(macro constant)
_IOFBF_IOLBF_IONBF
 argument to std::setbuf indicating fully buffered I/O
argument to std::setbuf indicating line buffered I/O
argument to std::setbuf indicating unbuffered I/O
(macro constant)
SEEK_SETSEEK_CURSEEK_END
 argument to std::fseek indicating seeking from beginning of the file
argument to std::fseek indicating seeking from the current file position
argument to std::fseek indicating seeking from end of the file
(macro constant)
TMP_MAX
 maximum number of unique filenames that can be generated by std::tmpnam
(macro constant)
L_tmpnam
 size needed for an array of char to hold the result of std::tmpnam
(macro constant)

Functions

File access
opens a file
(function)
open an existing stream with a different name
(function)
closes a file
(function)
synchronizes an output stream with the actual file
(function)
sets the buffer for a file stream
(function)
sets the buffer and its size for a file stream
(function)
Direct input/output
reads from a file
(function)
writes to a file
(function)
Unformatted input/output
Narrow character
gets a character from a file stream
(function)
gets a character string from a file stream
(function)
writes a character to a file stream
(function)
writes a character string to a file stream
(function)
reads a character from stdin
(function)
(until C++14)
 reads a character string from stdin
(function)
writes a character to stdout
(function)
writes a character string to stdout
(function)
puts a character back into a file stream
(function)
Formatted input/output
Narrow/multibyte character
reads formatted input from stdin, a file stream or a buffer
(function)
(C++11)(C++11)(C++11)
 reads formatted input from stdin, a file stream or a buffer
using variable argument list
(function)
(C++11)
 prints formatted output to stdout, a file stream or a buffer
(function)
(C++11)
 prints formatted output to stdout, a file stream or a buffer
using variable argument list
(function)
File positioning
returns the current file position indicator
(function)
gets the file position indicator
(function)
moves the file position indicator to a specific location in a file
(function)
moves the file position indicator to a specific location in a file
(function)
moves the file position indicator to the beginning in a file
(function)
Error handling
clears errors
(function)
checks for the end-of-file
(function)
checks for a file error
(function)
displays a character string corresponding of the current error to stderr
(function)
Operations on files
erases a file
(function)
renames a file
(function)
creates and opens a temporary, auto-removing file
(function)
returns a unique filename
(function)

Notes

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