The QT program loads the local font library (font format .ttc or .ttf)

int nfontId = QFontDatabase::addApplicationFont(":/ Sharp character Sharp Line Dream Black Jane V1.0.TTF");
qDebug()<<"fontId = "<< nfontId;//Equal to -1 failed to load
if(nfontId> =0)
{
　　QString msyh = QFontDatabase::applicationFontFamilies(nfontId).at(0);
　　qDebug() <<"msyh = " <<msyh;
　　QFont font(msyh);
　　QApplication::setFont(font);

}