Qt Code: 
  1. QSettings settings("HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Fonts",
  2.                        QSettings::NativeFormat);
  3.     QStringList list = settings.allKeys();
  4.  
  5.     for(int i=0;i<list.size();i++)
  6.     {
  7.         QString key = list.at(i);
  8.         QString text = settings.value(key).toString();
  9.         QStringList keys = key.split(" & ");
  10.         QString last = keys.last();
  11.         keys[keys.size()-1] = last.left(last.indexOf(" ("));
  12.         for(int j=0;j<keys.size();j++)
  13.         {
  14.             index.insert(keys[j], j);
  15.             name.insert(keys[j], text);
  16.         }
  17.     }
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you can use it as
Qt Code: 
  1. QString family = ui->fontComboBox->currentText();
  2.     QString path("C:/WINDOWS/Fonts/");
  3.     path.append(name[family]);
  4.     int in = index[family];
  5.     FT_New_Face(library, path.toUtf8(), in, &face)
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