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.NET Forum / Languages / Managed C++ / October 2005How do I copy the content of a string to a char array?
How do I copy the content of a string in one encoding (in my case big5) to a char array (unmanaged) of the same encoding? I try the following String line[] = S"123水泥"; char buffer[200]; for(int i=0; i<line->get_length(); i++) { buffer[i] = (char) line->Chars[i]; } It works fine for the first 3 Ascii characters, but gets messed up for the next 2 Chinese characters. What is wrong here? Hi Kueishiong! > How do I copy the content of a string in one encoding (in my case big5) to a > char array (unmanaged) of the same encoding? > String line[] = S"123水泥"; .NET strings have no special encoding!!! They are always stored in UTF-16. > char buffer[200]; You need to convert the UTF-16 string to the "big5" string! > for(int i=0; i<line->get_length(); i++) > { [quoted text clipped - 3 lines] > It works fine for the first 3 Ascii characters, but gets messed up for the > next 2 Chinese characters. What is wrong here? You can use the following: System::Text::Encoding *e = System::Text::Encoding::GetEncoding("big5"); System::Byte big5 __gc[] = e->GetBytes(S"123水泥"); char *szBig5 = new char[big5->get_Count()+1]; System::Byte __pin *b = &big5[0]; strncpy(szBig5, (char*) b, big5->get_Count()); szBig5[big5->get_Count()] = 0;  SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ > Hi Kueishiong! >> How do I copy the content of a string in one encoding (in my case [quoted text clipped - 4 lines] > .NET strings have no special encoding!!! They are always stored in > UTF-16. Actually, I believe it's UCS2. It's not UTF16 since there's no multi-word characters in the .NET representation and code points above 0xffff are simply not representable. >> char buffer[200]; > > You need to convert the UTF-16 string to the "big5" string! Or store it in wchar_t buffer[200] instead of char to preserve the UCS2 format. -cd Thank you very much for replying. I change buffer to wchar_t and the coping works fine. However the ultimate object I need is a char array becuase the code following it requires that. How do I convert a wchar_t array to a char array? From my experience I know a char array can store both a one-byte ASCII character and two-byte Chinese character. Kueishiong Tu Hi Carl! > Actually, I believe it's UCS2. It's not UTF16 since there's no multi-word In fact there is no multi-word, but there are high/loh-surrogates... And this _is_ UTF-16 (everything in windows is using UTF-16). See: http://www.unicode.org/notes/tn12/ <quote> Most major software with good Unicode support uses UTF-16 (or 16-bit Unicode strings). Note that much of the software listed below runs on Unix/Linux systems as well as Windows and others. - Everything Microsoft — Windows (including Pocket PC) and application </quote> > characters in the .NET representation and code points above 0xffff are > simply not representable. This would be very bad, then .NET would not support unicode!!! (and by the way: .NET *is* fully unicode enabled). At least with .NET 2.0, they added some classes to query all the necessary infos... See: StringInfo Class http://msdn2.microsoft.com/en-us/library/c4hkht93(en-us,VS.80).aspx See: StringInfo.ParseCombiningCharacters http://msdn2.microsoft.com/en-us/library/2wayc3ak(en-us,vs.80).aspx SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ > Hi Carl! > [quoted text clipped - 3 lines] > In fact there is no multi-word, but there are high/loh-surrogates... > And this _is_ UTF-16 (everything in windows is using UTF-16). Consider myself educated :) I didn't realize that support for code points above 0xffff was in fact included in .NET. I'm sure I've missed something, but I don't recall any very useful character sets in the code points at 10000 and above (e.g. Klingon, Elvish), but I'm happy to see that they're representable. -cd Hi Carl! > Consider myself educated :) I didn't realize that support for code points > above 0xffff was in fact included in .NET. I'm sure I've missed something, > but I don't recall any very useful character sets in the code points at > 10000 and above (e.g. Klingon, Elvish), but I'm happy to see that they're > representable. Some might be usefull (but you are right: most of them will never be used): 10000..1007F; Linear B Syllabary 10080..100FF; Linear B Ideograms 10100..1013F; Aegean Numbers 10140..1018F; Ancient Greek Numbers 10300..1032F; Old Italic 10330..1034F; Gothic 10380..1039F; Ugaritic 103A0..103DF; Old Persian 10400..1044F; Deseret 10450..1047F; Shavian 10480..104AF; Osmanya 10800..1083F; Cypriot Syllabary 10A00..10A5F; Kharoshthi 1D000..1D0FF; Byzantine Musical Symbols 1D100..1D1FF; *Musical Symbols* 1D200..1D24F; Ancient Greek Musical Notation 1D300..1D35F; Tai Xuan Jing Symbols 1D400..1D7FF; *Mathematical Alphanumeric Symbols* 20000..2A6DF; *CJK Unified Ideographs Extension B* 2F800..2FA1F; *CJK Compatibility Ideographs Supplement* E0000..E007F; Tags E0100..E01EF; Variation Selectors Supplement F0000..FFFFF; Supplementary Private Use Area-A 100000..10FFFF; Supplementary Private Use Area-B SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ Thank you very much for replying. "> System::Text::Encoding *e = System::Text::Encoding::GetEncoding("big5"); > System::Byte big5 __gc[] = e->GetBytes(S"123水泥"); However the source is something I read from a text file which is in a String. FileStream* fs = new FileStream(path, FileMode::Open); StreamReader* sr = new StreamReader(fs, Encoding::GetEncoding("big5")); String *line = sr->ReadLine(); As your suggestion, I have to convert a String to a Byte array. How do I do that? > char *szBig5 = new char[big5->get_Count()+1]; > System::Byte __pin *b = &big5[0]; > strncpy(szBig5, (char*) b, big5->get_Count()); > szBig5[big5->get_Count()] = 0; Kueishiong Tu Hi Kueishiong! > However the source is something I read from a text file which is in a String. > > FileStream* fs = new FileStream(path, FileMode::Open); > StreamReader* sr = new StreamReader(fs, Encoding::GetEncoding("big5")); > String *line = sr->ReadLine(); This does _not_ matter!!! If you have a "string" then it _is_ unicode. The encoding was only used while reading the file (and translating the big5-encoding to unicode). > As your suggestion, I have to convert a String to a Byte array. > How do I do that? >> char *szBig5 = new char[big5->get_Count()+1]; My example works very well. What is your problem? SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ In your example > System::Text::Encoding *e = System::Text::Encoding::GetEncoding("big5"); > System::Byte big5 __gc[] = e->GetBytes(S"123水泥"); > char *szBig5 = new char[big5->get_Count()+1]; > System::Byte __pin *b = &big5[0]; > strncpy(szBig5, (char*) b, big5->get_Count()); > szBig5[big5->get_Count()] = 0; you copy the content of Byte array pointed at by b to a char array szBig5. However what I need is to copy the content of a String to a char array. (said String *b = S"123水泥" to szBig5) > Hi Kueishiong! > [quoted text clipped - 13 lines] > > My example works very well. What is your problem? Hi Kueishiong! >>System::Text::Encoding *e = System::Text::Encoding::GetEncoding("big5"); >>System::Byte big5 __gc[] = e->GetBytes(S"123水泥"); [quoted text clipped - 6 lines] > However what I need is to copy the content of a String to a char array. > (said String *b = S"123水泥" to szBig5) Maybe we are talking about different things... I though you wanted a char-array in big5-encoding? Isn´t this what you wanted??? And excactly this does my example... It converts a "string" into an char-array which is encoded in "big5". SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ Hi Jochen! What I want is to copy the content of a String ( as the source is read from a text file using the following StreamReader sr->ReadLine() call and stored in the String class *line FileStream* fs = new FileStream(path, FileMode::Open); StreamReader* sr = new StreamReader(fs, Encoding::GetEncoding("big5")); String *line = sr->ReadLine(); ) to a char array (said buffer declared as char buffer[200]), i.e. move the contents in *line to buffer[]. > Hi Kueishiong! > [quoted text clipped - 16 lines] > And excactly this does my example... > It converts a "string" into an char-array which is encoded in "big5". Hi Kueishiong! > What I want is to copy the content of a String > [quoted text clipped - 7 lines] > > to a char array (said buffer declared as char buffer[200]), i.e. What is "char" ? 8-bit? > move the contents in *line to buffer[]. There is no difference between buffer[] and *buffer System::String *line = S"123水泥"; System::Text::Encoding *e = System::Text::Encoding::GetEncoding("big5"); System::Byte big5 __gc[] = e->GetBytes(line); char *buffer[ = new char[big5->get_Count()+1]; System::Byte __pin *b = &big5[0]; strncpy(buffer[, (char*) b, big5->get_Count()); buffer[big5->get_Count()] = 0; // now the buffer contains the char-array encoded in "big5" // after you have used the buffer, you need to destroy it... delete [] buffer; (and this was exactly my 1st reply...) SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ Dear Jochen: > System::Byte big5 __gc[] = e->GetBytes(line); It is the above line that converts from a String to a Byte array that I want. I put that in, and the whole program works fine. Thank you very much for help. Kueishiong Tu > Thank you very much for replying. > [quoted text clipped - 11 lines] > As your suggestion, I have to convert a String to a Byte array. > How do I do that? If the file contains a Byte array (ANSI string) and you need to pass the same byte array to another routine, then don't read a String (Unicode string). Read a byte array in the first place. Thank you very much for replying. > If the file contains a Byte array (ANSI string) and you need to pass the > same byte array to another routine, then don't read a String (Unicode > string). Read a byte array in the first place. How do I read the content of a text file in as a Byte array instread of a String which a StreamReader *sr->ReadLine() return? 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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