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二进制文件和基于ASCII的文件比较有什么区别？

[英]What is the difference between binary and ASCII based file comparison?

原文 2016-02-11 01:26:27 9 1 binary/ ascii/ diff/ file-diffs

If I use a file comparison tool like fc in Windows, you can choose between ASCII and binary comparison. 如果在Windows中使用fc类的文件比较工具，则可以在ASCII和二进制比较之间进行选择。

What is the actual difference between these two comparisons? 这两个比较之间的实际区别是什么？ If I compare two ASCII files, don't I want the binary data of the files to be identical? 如果我比较两个ASCII文件，是否不希望文件的二进制数据相同？

1 个解决方案

WARNING: this is 5 year old loose remembrance of knowledge from uni 警告：这是5年前对uni知识的宽松记忆

Binary representation means you compare the binary exactly, and ascii is a comparison of data type. 二进制表示表示您完全比较二进制，而ascii是数据类型的比较。 to put it in a simple case the char 'A' is a representation of 01000001, but that is also an 8 bit integer equal to '65', so that means A = 65 in binary. 简而言之，char'A'表示01000001，但这也是一个等于'65'的8位整数，因此意味着A = 65（二进制）。 so if you were doing A + A as a string and 65 43 65 (43 is '+' in binary to decimal), in binary they would be equivalent, but in ascii they would not. 因此，如果您将A + A作为字符串和65 43 65（二进制到十进制为43是“ +”），则在二进制中它们是等效的，但在ascii中则不是。 This is a very loose explanation and i'm sure i missed a lot, but that should sum it up loosely. 这是一个非常宽松的解释，我敢肯定我错过了很多，但这应该可以概括起来。

In a text file you want ASCII because you write in ascii characters. 在文本文件中，您需要ASCII，因为您使用的是ASCII字符。 In say, a program state saved to a file you want binary to get a direct comparison. 换句话说，程序状态保存到您要二进制文件进行直接比较的文件中。