Thread: Where is my UNICODE extended wide character ?

It seems that you've got the right character set support, but no font integrated to go with it. Fonts and character sets are very different things -- a font is mapped onto a character set (or is it the other way around?) so that each glyph is associated with a position (or code) within the character set. The meaning of the character is defined within the character set. Lacking a font that maps directly to a position within the Unicode character set, a good implementation will make an attempt to represent that meaning the best it can with glyphs that may best convey the intended meaning of the character. In your case, the font you're using does not have the line drawing glyphs, so it's substituting.

May be the line and corner are replaced by - and +, but when I typed <ALT+some number> I can see them. How can you explain that, I am wondering if the set are duplicated in the same font.

Also, I can not insert these number inside my code: I get wrong character.

It could be that the terminal window (or whatever program you're using) doesn't have a good map between the font that it's using and the character set encoding (which I assume is Unicode). The fact that it's not printing little square boxes or dots for all of those glyphs, but instead is attempting to make something that will look something like the intended representation means that it is doing some mapping or another.

What terminal program are you using as your command line? What are its character set encoding settings? It's font settings? Is your localle set up properly? All of these may effect this sort of thing.

(By character set encoding, I mean UTF8, UTF16, us-ascii, ISO-latin-1, etc. The font is the typeface.)