Question

Does Scintilla really support Unicode? If so, why does SCI_GETCHARAT return a char value (casted to LRESULT)?

Answer 1

From the SCI_SETCODEPAGE docs…

Code page SC_CP_UTF8 (65001) sets Scintilla into Unicode mode with the document treated as a sequence of characters expressed in UTF-8. The text is converted to the platform’s normal Unicode encoding before being drawn by the OS and thus can display Hebrew, Arabic, Cyrillic, and Han characters.

You will have to examine the byte you retrieve with SCI_GETCHARAT(pos) and, depending on the top bits of that, maybe read SCI_GETCHARAT(pos+1) and beyond in order to get the Unicode code point. (See here.)

Edit:

For some C++ code that does this, see below (search for SciMoz::GetWCharAt):

http://vacuproj.googlecode.com/svn/trunk/npscimoz/npscimoz/oldsrc/trunk.nsSciMoz.cxx