[Qt-interest] Help, Amazing to the QPainter, when I set some QFont to drawText, but the fontInfo is failed to change!

[lvbing lvbing]

Hi All,
    I have a program when I want to draw some text to my paintdevice!,
    I create a new font and user setFont function to set into my painter,but
when I use the fontInfo
to view the font infomation,the font infomation is still the old font,
the code like this:
void Fun(QPainter* painter,/*......*/)
{
    QFont font;
    font.setFamily("..."); //some font I wanted
    painter.setFont(font);
    //do something
}

when I user (painter->fontInfo().family() to see what font the painter use,
and the font did not changed!
but sometime,the new font will be setted!

who knows how to user the function of the setFont in the class QPainter ?
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