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Searching, Modifying, and Encoding Text
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To help reduce these problems, American National Standards Institute (ANSI) defined standardized code pages that had standard ASCII values for 0 through 127, and language-specific values for 128 through 255. A code page is a list of selected character codes (characters represented as code points) in a certain order. Code pages are usually defined to support specific languages or groups of languages that share common writing systems. Windows code pages contain 256 code points and are zero-based. If you ve ever received an e-mail message or seen a Web page that seemed to have box characters or question marks where letters should appear, you have witnessed an encoding problem. Because people create Web pages and e-mails in many different languages, each must be tagged with an encoding type. For example, an e-mail might include one of the following headers:
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Content-Type: text/plain; charset=ISO-8859-1 Content-Type: text/plain; charset="Windows-1251"
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ISO-8859-1 corresponds to code page 28591, Western European (ISO) . If it had specified ISO-8859-7 , it could have contained characters from the Greek (ISO) code page, number 28597. Similarly, HTML Web pages typically include a meta tag such as one of the following:
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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More and more, ASCII and ISO 8859 encoding types are being replaced by Unicode. Unicode is a massive code page with tens of thousands of characters that support most languages and scripts, including Latin, Greek, Cyrillic, Hebrew, Arabic, Chinese, and Japanese (and many other scripts). Unicode itself does not specify an encoding type; however, there are several standards for encoding Unicode. The .NET Framework uses Unicode UTF-16 (Unicode Transformation Format, 16-bit encoding form) to represent characters. In some cases, the .NET Framework uses UTF-8 internally. The System.Text namespace provides classes that allow you to encode and decode characters. System.Text encoding support includes the following encodings:
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Unicode UTF-32 encoding Unicode UTF-32 encoding represents Unicode char-
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acters as sequences of 32-bit integers. You can use the UTF32Encoding class to convert characters to and from UTF-32 encoding.
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Unicode UTF-16 encoding Unicode UTF-16 encoding represents Unicode char-
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acters as sequences of 16-bit integers. You can use the UnicodeEncoding class to convert characters to and from UTF-16 encoding.
Lesson 2: Encoding and Decoding
Unicode UTF-8 encoding Unicode UTF-8 uses 8-bit, 16-bit, 24-bit, and up to 48-bit
encoding. Values 0 through 127 use 8-bit encoding and exactly match ASCII values, providing some degree of interoperability. Values from 128 through 2047 use 16-bit encoding and provide support for Latin, Greek, Cyrillic, Hebrew, and Arabic alphabets. Values 2048 through 65535 use 24-bit encoding for Chinese, Japanese, Korean, and other languages that require large numbers of values. You can use the UTF8Encoding class to convert characters to and from UTF-8 encoding.
ASCII encoding ASCII encoding encodes the Latin alphabet as single 7-bit ASCII
characters. Because this encoding only supports character values from U+0000 through U+007F, in most cases it is inadequate for internationalized applications. You can use the ASCIIEncoding class to convert characters to and from ASCII encoding.
ANSI/ISO Encodings The System.Text.Encoding class provides support for a wide
range of ANSI/ISO encodings.
MORE INFO Unicode
For more information about Unicode, see The Unicode Standard at http://www.unicode.org.
Using the Encoding Class
You can use the System.Text.Encoding.GetEncoding method to return an encoding object for a specified encoding. You can use the Encoding.GetBytes method to convert a Unicode string to its byte representation in a specified encoding. The following code example uses the Encoding.GetEncoding method to create a target encoding object for the Korean code page. The code calls the Encoding.GetBytes method to convert a Unicode string to its byte representation in the Korean encoding. The code then displays the byte representations of the strings in the Korean code page.
' VB ' Get Korean encoding Dim e As Encoding = Encoding.GetEncoding("Korean") ' Convert ASCII bytes to Korean encoding Dim encoded As Byte() encoded = e.GetBytes("Hello, world!") ' Display the byte codes Dim i As Integer For i = 0 To encoded.Length - 1 Console.WriteLine("Byte {0}: {1}", i, encoded(i)) Next i
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