So yo advise me to change the line:
Qt Code: 
  1. iconv_t cd = createIconv_t(UTF16, 0);
To copy to clipboard, switch view to plain text mode 
that is placed in some qt file
to
Qt Code: 
  1. iconv_t cd = createIconv_t(UTF16, NULL);
To copy to clipboard, switch view to plain text mode 
??
Just don't get the idea why my actions that are actually a commonplace (initialization of two QRadioButton's and its usage) entail a problem I presented above.
It's quite bizarre.