fclose, _fcloseall

Visual Studio 6.0

Closes a stream (fclose) or closes all open streams (_fcloseall).

int fclose( FILE *stream );

int _fcloseall( void );

Function Required Header Compatibility
fclose <stdio.h> ANSI, Win 95, Win NT
_fcloseall <stdio.h> ANSI, Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.


LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

Return Value

fclose returns 0 if the stream is successfully closed. _fcloseall returns the total number of streams closed. Both functions return EOF to indicate an error.



Pointer to FILE structure


The fclose function closes stream. _fcloseall closes all open streams except stdin, stdout, stderr (and, in MS-DOS®, _stdaux and _stdprn). It also closes and deletes any temporary files created by tmpfile. In both functions, all buffers associated with the stream are flushed prior to closing. System-allocated buffers are released when the stream is closed. Buffers assigned by the user with setbuf and setvbuf are not automatically released.


/* FOPEN.C: This program opens files named "data"
 * and "data2".It  uses fclose to close "data" and
 * _fcloseall to close all remaining files.

#include <stdio.h>

FILE *stream, *stream2;

void main( void )
   int numclosed;

   /* Open for read (will fail if file "data" does not exist) */
   if( (stream  = fopen( "data", "r" )) == NULL )
      printf( "The file 'data' was not opened\n" );
      printf( "The file 'data' was opened\n" );

   /* Open for write */
   if( (stream2 = fopen( "data2", "w+" )) == NULL )
      printf( "The file 'data2' was not opened\n" );
      printf( "The file 'data2' was opened\n" );

   /* Close stream */
   if( fclose( stream ) )
      printf( "The file 'data' was not closed\n" );

   /* All other files are closed: */
   numclosed = _fcloseall( );
   printf( "Number of files closed by _fcloseall: %u\n", numclosed );


The file 'data' was opened
The file 'data2' was opened
Number of files closed by _fcloseall: 1

Stream I/O Routines

See Also   _close, _fdopen, fflush, fopen, freopen