VSS 2013 fopen_s用法

参考:
http://bbs.csdn.net/topics/190162053

//         


// crt_fopen_s.c
// This program opens two files. It uses
// fclose to close the first file and
// _fcloseall to close all remaining files.
 

#include <stdio.h>

FILE *stream, *stream2;

int main( void )
{
   int numclosed;
   errno_t err;

   // Open for read (will fail if file "crt_fopen_s.c" does not exist)
   if( (err  = fopen_s( &stream, "crt_fopen_s.c", "r" )) !=0 )
      printf( "The file 'crt_fopen_s.c' was not opened
" );
   else
      printf( "The file 'crt_fopen_s.c' was opened
" );

   // Open for write 
   if( (err = fopen_s( &stream2, "data2", "w+" )) != 0 )
      printf( "The file 'data2' was not opened
" );
   else
      printf( "The file 'data2' was opened
" );

   // Close stream if it is not NULL 
   if( stream)
   {
      if ( fclose( stream ) )
      {
         printf( "The file 'crt_fopen_s.c' was not closed
" );
      }
   }

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

scanfs("%s"，filename)///3番目のパラメータが指定されているはずです。filenameには文字の個数を入れられます。3番目のパラメータはデフォルトで0です。再指定しないと、filenameには何も得られません。
例えば、
scanfs("%s"，filename，10);