windows - QTextEdit unicode QString not working -

i'm trying write method prints messages in qtextedit, using custom font (veteran typewriter). font use supports unicode when use in application, characters 'ą', 'ę', 'ż' , other polish characters not shows correctly (all replaced �). have idea why? how force use unicode? (i'm using visual studio 2013 community + qt5 add-on, on windows 10 x64 , project defined x64 too).

my code:

void qtcubic::qtcstartscreen::sendmessage(qstring message) {     if (log.toplaintext().length() != 0) {         log.insertplaintext("\n");     }     log.insertplaintext(message); } 

and how send example meassage:

splashscreen.sendmessage("zażółć gęślą jaźń"); 

if you're going use unicode string literals in qt, should using qstringliteral macro.

in other words, code this:

splashscreen.sendmessage(qstringliteral("zażółć gęślą jaźń"));