On 04.11.2011 00:14, Stephan T. Lavavej wrote:
[Alf P. Steinbach]
I found that the Visual C++ implementation of the C library i/o generally does not support console input of international characters. It can deal with narrow character input from the current codepage, if that codepage is not UTF-8.
Changing the console's codepage isn't the right magic. See http://blogs.msdn.com/b/michkap/archive/2008/03/18/8306597.aspx
Thanks! :-) But did you notice that the article you replied to, had a link to that exact page, and contained code using the technique Kaplan describes?
With _O_U16TEXT, VC8+ can write Unicode to the console perfectly. However, I believe that input was broken up to and including VC10, and that it's been fixed in VC11.
Nope, sorry. <code> #include <stdio.h> int main() { printf( "? " ); char buffer[80]; scanf( "%s", buffer ); printf( "%s\n", buffer ); } </code> <result> D:\dev\test> (cl 2>&1) | find /i "c++" Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 17.00.40825.2 for 80x86 D:\dev\test> set CL=/nologo /EHsc /GR /W4 D:\dev\test> cl utf8test.cpp utf8test.cpp utf8test.cpp(7) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To di sable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\INCLUDE\stdio.h(290) : see declaration of 'scanf' D:\dev\test> chcp 1252 Active code page: 1252 D:\dev\test> utf8test ? abcæøå abcæøå D:\dev\test> chcp 65001 Active code page: 65001 D:\dev\test> utf8test ? abcæøå 1? D:\dev\test> _ </result>
(I don't know about UTF-8. For reasons that are still mysterious to me, UTF-8 typically isn't handled as well as people expect it to be. Windows really really likes UTF-16 for Unicode. In practice, this is not a big deal, because UTF-8 and UTF-16 are losslessly convertible.)
I think you're right that it's not a big deal for professional software development, because what professional developer depends on correct input of international characters from a Windows console window? Not me... (But then it's been some years since I was a prof. dev.) But I think it is important that students should be able to write the same kinds of program code, as they will later do as professionals. And for that reason it would be Really Nice if the Visual C++ runtime library is able to deal with interactive UTF-8 input. Note that if standard input is redirected to come from file, then it works OK. Cheers, & thanks for helping, - Alf