Base64的字符串抛出无效字符错误 [英] Base64 String throwing invalid character error

问题描述

我不断收到以Base64无效字符的错误，即使我不应该。

I keep getting a Base64 invalid character error even though I shouldn't.

这个程序有一个XML文件，并将其导出到一个文件中。如果用户希望，它将玉米preSS的所述文件中。在COM pression工作正常，并返回一个字符串的Base64是连接codeD转换为UTF-8，并写入到一个文件中。

The program takes an XML file and exports it to a document. If the user wants, it will compress the file as well. The compression works fine and returns a Base64 String which is encoded into UTF-8 and written to a file.

当其时该文件加载到程序中我要检查其是否COM pressed与否，code是简单的：

When its time to reload the document into the program I have to check whether its compressed or not, the code is simply:

byte[] gzBuffer = System.Convert.FromBase64String(text);
return "1F-8B-08" == BitConverter.ToString(new List<Byte>(gzBuffer).GetRange(4, 3).ToArray());

它检查字符串的开头，看它是否具有的gzip code在里面。

It checks the beginning of the string to see if it has GZips code in it.

现在的事情是，我所有的测试工作。我有一个字符串，COM preSS它，DECOM preSS它，并将其与原来的。问题是，当我从ADO记录集返回的字符串。该字符串正是被写入文件（并在最后增加了一个\ 0，但我不认为，即使做任何事情，甚至修剪掉它仍然抛出）。我甚至复制并粘贴整个字符串到测试方法和COM preSS / DECOM preSS的。正常工作。

Now the thing is, all my tests work. I take a string, compress it, decompress it, and compare it to the original. The problem is when I get the string returned from an ADO Recordset. The string is exactly what was written to the file (with the addition of a "\0" at the end, but I don't think that even does anything, even trimmed off it still throws). I even copy and pasted the entire string into a test method and compress/decompress that. Works fine.

该测试将通过，但在code将使用完全相同的字符串失败？唯一的区别是刚刚宣布的规则字符串，并通过它，我得到一个从记录返回而不是。

The tests will pass but the code will fail using the exact same string? The only difference is instead of just declaring a regular string and passing it in I'm getting one returned from a recordset.

这是我在做什么任何想法错了？

Any ideas on what am I doing wrong?

推荐答案

您说

该字符串正是被写   到该文件（通过加入一   \ 0结尾，但我不认为   即使做任何事情）。

The string is exactly what was written to the file (with the addition of a "\0" at the end, but I don't think that even does anything).

在事实上，它确实做一些事情（它会导致你的code抛出一个出现FormatException ：无效字符一个base-64字符串），因为<一个href="http://msdn.microsoft.com/en-us/library/system.convert.frombase64string.aspx"><$c$c>Convert.FromBase64String不考虑\ 0是一个有效的Base64字符

In fact, it does do something (it causes your code to throw a FormatException:"Invalid character in a Base-64 string") because the Convert.FromBase64String does not consider "\0" to be a valid Base64 character.

  byte[] data1 = Convert.FromBase64String("AAAA\0"); // Throws exception
  byte[] data2 = Convert.FromBase64String("AAAA");   // Works

解决方法：摆脱零终止（也许叫 .Trim（\ 0））

备注

借助 MSDN文档的 Convert.FromBase64String 说，这将抛出一个出现FormatException 在

s的长度，忽略空白   字符，不为零或者多   4。

The length of s, ignoring white space characters, is not zero or a multiple of 4.

- 或 -

s的格式无效。 s包含非基本64字符，更   两个以上的填充字符，或一个   在非空白字符   填充字符。

The format of s is invalid. s contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters.

和

该基地64升序排列数字   从零是大写字符   A到Z，小写字母'A'   以Z，数字0至9，和   符号+和/'.

The base 64 digits in ascending order from zero are the uppercase characters 'A' to 'Z', lowercase characters 'a' to 'z', numerals '0' to '9', and the symbols '+' and '/'.

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