BBC BASIC Programmers' Reference

by Richard Russell, March 2015

LB Booster provides built-in support to output Unicode text to the mainwin, and to the printer using LPRINT, but not to GUI controls. In the case of controls other than a TEXTEDITOR it is quite easy to support Unicode output using a little API code.

Below is listed a program to illustrate displaying Cyrillic text in a GRAPHICBOX (ensure that you select Unicode Support in the Options menu):

 global CP.UTF8
 CP.UTF8 = hexdec("FDE9")
 nomainwin

 graphicbox #w.gb, 10, 10, 280, 100
 open "Unicode test" for window as #w
 #w "trapclose  [quit]"
 #w.gb "font Times_New_Roman 20"
 hwgb = hwnd(#w.gb)
 call GraphicsTextUnicode hwgb, "Это демонстрация"
 call GraphicsTextUnicode hwgb, "российского текста"
 wait

[quit]
 close #w
 end

sub GraphicsTextUnicode hgb, utf8$
 calldll #kernel32, "MultiByteToWideChar", _
   CP.UTF8 as long, 0 as long, _
   utf8$ as ptr, -1 as long, _
   0 as long, 0 as long, ret as long
   bytes = 2 * ret
 calldll #kernel32, "GlobalAlloc", 0 as long, _
   bytes as long, wide as long
 calldll #kernel32, "MultiByteToWideChar", _
   CP.UTF8 as long, 0 as long, _
   utf8$ as ptr, -1 as long, _
   wide as long, ret as long, ret as long
 calldll #gdi32, "GetDC", hgb as ulong, hdc as ulong
 struct rc, left as long, top as long, _
            right as long, bottom as long
 calldll #gdi32, "GetCurrentPositionEx", _
   hdc as ulong, rc as struct, ret as long
 calldll #user32, "DrawTextW", hdc as ulong, wide as long, _
   -1 as long, rc as struct, 2304 as long, ret as long
 rc.bottom.struct += ret
 calldll #gdi32, "MoveToEx", hdc as ulong, _
    rc.left.struct as long, rc.bottom.struct as long, _
    0 as long, ret as long
 calldll #kernel32, "GlobalFree", wide as long, _
   ret as long
end sub