1.The fgets, fgetss, fread, fscanf, and fclose functions also return False on error.
fscanf和fclose函数在出错时也返回False。
2.Note that no matter what number you specify, fread will not read more than 8, 192 bytes (8 KB).
不管指定多少字节，fread都不会读取超过8,192个字节（8KB）。
