FILE *stream; errno_t err; // Open for read (will fail if file "crt_fopen_s.c" does not exist) err = fopen_s( &stream, "crt_fopen_s.c", "r" ); if( err == 0 ) { printf( "The file 'crt_fopen_s.c' was opened\n" ); } else { printf( "The file 'crt_fopen_s.c' was not opened\n" ); } 출처: https://developmentlee.tistory.com/273 [developmentlee]