字节流编码获取原来这么复杂,但也很简单
一)需求
很多情况下我们需要知道字节流的编码,比如
1) 使用编辑器打开文本文件的时候,编辑器需要识别文本文件的各种编码
2) 上传文件后,分析上传文件字节流需要知道它的编码
3) 读取某个web页面的源代码,并要输出时,需要知道正确的编码才能输出正确的内容
二)探讨
最初和同事讨论如何获取文件/流/字节是否是utf8编码时,发现c#并没有直接的函数,但在SDK中发现UTF8的开头三个字节是“0xEF 0xBB 0xBF”(称为BOM--Byte Order Mark),Unicode文件的开头两个字节是“0xFF 0xFE”,UTF16SmallEndian文件的开头两个字节是“0xFE 0xFF”,于是写了一个简单的函数去解决,由于没有时间做足够的测试,总觉得会有问题.......
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问题出现了,第二天同事告诉我,不是所有的UTF8编码的文件都有BOM信息,那如何解决呢?他先找到了答案 字节流编码获取原来这么复杂 (我也在google和baidu上搜索过,发现C#并没有很好的解决方案)
以下是两篇相关解决问题的文章(java)
http://dev.csdn.net/Develop/article/10/10961.shtm
http://dev.csdn.net/Develop/article/10/10962.shtm
java代码很容易移植到.NET上,那我就来为大家铺条路...
代码有2400多行,请在这里下载代码:下载代码
在移植代码的过程中感谢以下朋友的参与:
playyuer