c++ - How to find runs of bold text inside of a RichEdit control? -

i can 1 character @ time using em_getcharformat, extremely slow.

one idea somehow use itextdocument/itextfont interfaces, other use em_streamout message , manually parse rtf. can't decide approach better , fuzzy on implementation details. appreciate help, thanks!

i've found solution satisfies me , think share you:

the itextrange interface contains useful method expand can used find continuous runs of constant character (tomcharformat) , paragraph (tomparaformat) formatting.

here sample code (warning: code proof-of-concept spaghetti without error handling, apply refactoring needed):

    // necessary interfaces     iricheditole* ole;     sendmessage(hwndrichedit, em_getoleinterface, 0, (lparam)&ole);      itextdocument* doc;     ole->queryinterface(__uuidof(itextdocument), (void**)&doc);      long start = 0;      // total length:             itextrange* range;     doc->range(start, start, &range);     range->expand(tomstory, null);     long eof;     range->getend(&eof);      // extract formatting:      struct textcharformat { long start, length; dword effects; }     std::vector<textcharformat> fs;      while(start < eof - 1)     {         doc->range(start, start, &range);          long n;         range->expand(tomcharformat, &n); // <-- magic happens here          itextfont* font;         range->getfont(&font);          dword effects = 0;         long flag;          font->getbold(&flag);         if (flag == tomtrue) effects |= cfe_bold;          font->getitalic(&flag);         if (flag == tomtrue) effects |= cfe_italic;          font->getunderline(&flag);         if (flag == tomsingle) effects |= cfe_underline;          font->getstrikethrough(&flag);         if (flag == tomtrue) effects |= cfe_strikeout;          if (effects)         {             textcharformat f = { start, n, effects };             fs.push_back(f);         }         start += n;     }