如何编码和解码破碎的中文/ Unicode字符？

Question

I've tried googling around but wasn't able to find what charset that this text below belongs to:

具有éœé›»ç”¢ç”Ÿè£ç½®ä¹‹å½±åƒè¼¸å…¥è£ç½®

But putting <meta http-equiv="Content-Type" Content="text/html; charset=utf-8"> and keeping that string into an HTML file, I was able to view the Chinese characters properly:

具有靜電產生裝置之影像輸入裝置

So my question is:

1. What tools can I use to detect the character set of this text?

2. And how do I convert/encode/decode them properly in C#?

Updates: For completion sake, i've updated this test.

   [TestMethod]
    public void TestMethod1()
    {
        string encodedText = "具有éœé›»ç”¢ç”Ÿè£ç½®ä¹‹å½±åƒè¼¸å…¥è£ç½®";
        Encoding utf8 = new UTF8Encoding();
        Encoding window1252 = Encoding.GetEncoding("Windows-1252");

        byte[] postBytes = window1252.GetBytes(encodedText);

        string decodedText = utf8.GetString(postBytes);
        string actualText = "具有靜電產生裝置之影像輸入裝置";
        Assert.AreEqual(actualText, decodedText);
    }
}

Thanks.

Answer 1

What is happening when you save the "bad" string in a text file with a meta tag declaring the correct encoding is that your text editor is saving the file with Windows-1252 encoding, but the browser is reading the file and interpreting it as UTF-8. Since the "bad" string is incorrectly decoded UTF-8 bytes with the Windows-1252 encoding, you are reversing the process by encoding the file as Windows-1252 and decoding as UTF-8.

Here's an example:

using System.Text;
using System.Windows.Forms;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "具有靜電產生裝置之影像輸入裝置"; // Unicode
            Encoding Windows1252 = Encoding.GetEncoding("Windows-1252");
            Encoding Utf8 = Encoding.UTF8;
            byte[] utf8Bytes = Utf8.GetBytes(s); // Unicode -> UTF-8
            string badDecode = Windows1252.GetString(utf8Bytes); // Mis-decode as Latin1
            MessageBox.Show(badDecode,"Mis-decoded");  // Shows your garbage string.
            string goodDecode = Utf8.GetString(utf8Bytes); // Correctly decode as UTF-8
            MessageBox.Show(goodDecode, "Correctly decoded");

            // Recovering from bad decode...
            byte[] originalBytes = Windows1252.GetBytes(badDecode);
            goodDecode = Utf8.GetString(originalBytes);
            MessageBox.Show(goodDecode, "Re-decoded");
        }
    }
}

Even with correct decoding, you'll still need a font that supports the characters being displayed. If your default font doesn't support Chinese, you still might not see the correct characters.

The correct thing to do is figure out why the string you have was decoded as Windows-1252 in the first place. Sometimes, though, data in a database is stored incorrectly to begin with and you have to resort to these games to fix the problem.

Answer 2

string test = "敭畳灴獩楫n"; //incoming data. must be mesutpiskin 

byte[] bytes = Encoding.Unicode.GetBytes(test);

string s = string.Empty;

for (int i = 0; i < bytes.Length; i++)
{
    s += (char)bytes[i];
}

s = s.Trim((char)0);

MessageBox.Show(s);
//s=mesutpiskin 

Answer 3

I'm not really sure what you mean, but I'm guessing you want to convert between a string in a certain encoding in byte array form and a string. Let's assume the character encoding is called "FooBar":

This is how you encode and decode:

Encoding myEncoding = Encoding.GetEncoding("FooBar");
string myString = "lala";
byte[] myEncodedBytes = myEncoding.GetBytes(myString);
string myDecodedString = myEncoding.GetString(myEncodedBytes);

You can learn more about the Encoding class over at MSDN .

Answer 4

Answering your question at the end of your post:

1. If you want to determine the text encoding on runtime you should look at that: http://code.google.com/p/ude/

2. for converting character sets you can use http://msdn.microsoft.com/en-us/library/system.text.encoding.convert(v=vs.100).aspx

Answer 5

它是Windows Latin 1.我将中文文本作为UTF-8粘贴到BBEDIT（Mac的文本编辑器）中，并将文件重新打开为Windows Latin 1和bang，出现了确切的变音符号。