3、部分设备自带文本编辑器无法识别中文字符，无论是ansi或者unicode格式；
4、读取和写入unicode文本时，需要使用"b"修饰符，如"rb"、"wb"，不受fgets和fgetws的影响；
5、输出格式控制符说明：
single-byte character with printf functions h c or c
single-byte character with wprintf functions h c or c
wide character with printf functions l c or c
wide character with wprintf functions l c or c
single-byte – character string with printf functions h s or s
single-byte – character string with wprintf functions h s or s
wide-character string with printf functions l s or s
wide-character string with wprintf functions l s or s
