open二进制问题
打开文件w,r, 与wb,rb的区别
与具体语言无关，与操作系统相关，以下来自ubuntu的man fopen的内容:
The mode string can also include the letter 'b' either as a last character or as a character
between the characters in any of the two-character strings described above. This is strictly
for compatibility with C89 and has no effect; the 'b' is ignored on all POSIX conforming sys‐
tems, including Linux. (Other systems may treat text files and binary files differently, and
adding the 'b' may be a good idea if you do I/O to a binary file and expect that your program
may be ported to non-UNIX environments.)
这里只说明了linux会忽略b选项，也就是wb,rb等同于w,r但是不确定其他操作系统的操作
经过测试和查资料发现在windows上有如下不同
- w 会将 \n 转换成 \r\n 而wb不会
- r 会将 \r\n 转换成 \n 而rb不会（未测试）
所以建议二进制读写都设置b选项
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