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.NET Forum / .NET Framework / New Users / December 2005Extended ASCII Encoding in .NET
Does anyone know how to decode extended ASCII string into extended ASCII bytes? For example, "ä" is 228 in the extended ASCII character set. ASCIIEncoding supports 7-bit ASCII, thus every character in the extended set is decoded as "?". UnicodeEncoding, UTF7Encoding, UTF8Encoding, UTF32Encoding does not provide correct results. I was thinking to create a new encoder class, but before that I would like to know if there is some class in .NET which can do the encoding. Reading specific encoding is supported in .NET. Try code simular to the following: _inputReader = new StreamReader(inputStream, System.Text.Encoding.ASCII.WindowsCodePage); _line = _inputReader.ReadLine(); Replace the System.Text.Encoding.ASCII.WindowsCodePage with your requested encoding type and the StreamReader will do the rest. G > Does anyone know how to decode extended ASCII string into extended ASCII > bytes? [quoted text clipped - 10 lines] > that I would like to know if there is some class in .NET which can do the > encoding. > Does anyone know how to decode extended ASCII string into extended ASCII bytes? There is no one "extended ASCII" encoding. > For example, "?" is 228 in the extended ASCII character set. In *which* "extended ASCII" character set? There are lots of code pages which might all be called "extended ASCII". You need to find out which code page you really mean, then ask for the encoding for that code page. See http://www.pobox.com/~skeet/csharp/unicode.html for more information.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too Hello Jon, Thank you for your comments and help. Problem still exists, but I found a detour. By Extended ASCII set I ment characters with ASCII codes 128 ... 255, this set is also called as the "IBM character set" or 8-bit ASCII. In the following, I refer to this set of characters. Closest codepage in my application is 28591. Gerrit's reply gave me idea to try using encoding class as follows: Encoding enc = Encoding.GetEncoding(28591); byte[] encodedBytes = enc.GetBytes(myString); However, this does not produce extended ASCII character set. For example encodedBytes = enc.GetBytes("ä"); // encodedBytes[0] = 228, encodedBytes.Length = 1 // "ä" is character number 132 in the Extended ASCII set However, it is not absolutely necessary to have ASCII conversion as long as the conversion is unique, that is each character in the Extended set gets unique value between 128 ... 255. Having conversion to 8-bit ASCII would have been the best option, but this other option seems to provide a workable solution. > > Does anyone know how to decode extended ASCII string into extended ASCII bytes? > [quoted text clipped - 10 lines] > See http://www.pobox.com/~skeet/csharp/unicode.html for more > information. Hi, The following encodings seem to fulfill your 'ä' = 132 request 437 - IBM437 775 - ibm775 850 - ibm850 852 - ibm852 857 - ibm857 858 - IBM00858 861 - ibm861 865 - IBM865 29001 - x-Europa But I expect you require on of the IBM 850/852 encodings, which are/were used widely. But I've never heard of any of them to be refered to as "Extended ASCII" ;) HTH, Stefan > Hello Jon, > [quoted text clipped - 35 lines] >> See http://www.pobox.com/~skeet/csharp/unicode.html for more >> information. > Thank you for your comments and help. Problem still exists, but I found a > detour. > > By Extended ASCII set I ment characters with ASCII codes 128 ... 255, this > set is also called as the "IBM character set" or 8-bit ASCII. That doesn't describe a single set of characters. What unicode character do you want byte 128 to mean, for instance? What unicode character do you want byte 129 to mean? > In the following, I refer to this set of characters. > [quoted text clipped - 9 lines] > // encodedBytes[0] = 228, encodedBytes.Length = 1 > // "?" is character number 132 in the Extended ASCII set What actual character is it? > However, it is not absolutely necessary to have ASCII conversion as long as > the conversion is unique, that is each character in the Extended set gets > unique value between 128 ... 255. Having conversion to 8-bit ASCII would have > been the best option, but this other option seems to provide a workable > solution. If you could tell us which Unicode character you expect to get from each byte, we could probably work out which encoding you actually mean. Did you read the link I referenced, by the way? SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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