why cannot I drawtext on the widget??

I used the following codes:
QWdiget *widget=new QWidget(this);
QPainter painter(widget);
QRect rect=painter.window();
painter.eraseRect(rect);
QString text="Hello!";
painter.setBackgroundColor(QColor("white"));
painter.setPen(QColor("black"));
painter.drawText(rect,AlignHCenter,text);

but cannot see any word on the widget,I don't know why.

Does QT support Chinese Characters?

I found that Chinese Characters cannot be diaplayed in QTextView correctly.

How to call a executable file in Qt???

I want to call an existing executable file in Qt,but don't know how to do it.

does QT have a function that can stretch picture?

I want to display a picture in a widget ,but it's size is bigger than the widget's.Does QT have such a funciont that can stretch a picture freely or what can I do for displaying the picture?

make errors when trying to install qtopia

[cynthia@cynthia src]$ make
make -C libraries/qtopia
make[1]: Entering directory `/home/cynthia/qtopia/qtopia-free-1.6.0/src/libraries/qtopia'
/home/cynthia/qtopia/qt-2.3.4/bin/uic passwordbase_p.ui -o ./passwordbase_p.h
make[1]: /home/cynthia/qtopia/qt-2.3.4/bin/uic: Command not found
make[1]: *** [passwordbase_p.h] Error 127
make[1]: Leaving directory `/home/cynthia/qtopia/qtopia-free-1.6.0/src/libraries/qtopia'
make: *** [libraries/qtopia] Error 2

I've install qt-2.3.4 successfully,I don't know why this would happen.Pleas help me ,thanks.