C#Binarywriter写字符串 [英] c# binarywriter write string

问题描述

你好，我打算用C#中的binarywriter将char写入二进制文件:

Howdy, I intend to write char to a binary file with binarywriter in C#:

FileStream filestream = new FileStream("test.t", FileMode.Create, FileAccess.Write, FileShare.Read, 1024);
      BinaryWriter binaryWriter = new BinaryWriter(filestream);
      binaryWriter.Write("hello");
      binaryWriter.Write("AAA");
      binaryWriter.Close();
      file.Close();

但是，当我检查输出文件时，我发现每个字符串的前面都有多余的字节，因此，hello变成了六个字符: 0x05''h''''e''''l''''l ''''o''和"AAA"变成四个字符: 0x03''A''''A''''A''

有人知道为什么吗?



VS 2008
在win7和xp中进行测试.

But when I exam the output file I found there are extra bytes in the front of each string, such that the hello become six chars: 0x05 ''h''''e''''l''''l''''o'' and "AAA" become four chars: 0x03''A''''A''''A''

Anyone know why?



VS 2008
Test in win7 and xp.

推荐答案

是.

简单:前缀就是长度.如果尝试使用此处实际编写的代码(并修复编译错误-它应为"filestream.Close()")，您将发现该文件包含

Yes.

Simple: the prefix is the lengths. If you try with the code you actually wrote here, (and fix the compilation error - it should be "filestream.Close()" - you will find that the file contains

0x05  - number of characters in the string "hello"
'h'
'e'
'l'
'l'
'o'
0x03  - number of characters in the string "AAA"
'A'
'A'
'A'

您的应用程序中此版本的字符串以十个字符开头，而不是五个

The version of this in your application had a string of ten characters to start with, rather than five

字符串前面有一个长度字节，如此处 [

Strings are preceded by a length byte as described here[^]. It''s always best to read the documentation first.

如果您不需要或不需要长度字节，可以使用Char []数组而不是String调用Write.

If you don''t want or need the length byte you can call Write with a Char [] array instead of a String.

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