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void Widget::paintEvent(QPaintEvent *e)
{
QPainter painter(this);
painter.drawPixmap(0,0,this->width(),this->height(),QPixmap(":/xxx.png"));
}
widget->setStyleSheet("border-image: url(:/xxx.png)");
HttpClient *httpclient = new HttpClient();
QPixmap pixmap(":bg.PNG");
QPalette pal;
pal.setBrush(httpclient->backgroundRole(),QBrush(pixmap));
httpclient->setPalette(pal);
httpclient->setAutoFillBackground(true);
httpclient->setWindowFlags(Qt::WindowMinMaxButtonsHint);//窗口的最大小化
httpclient->show();
return a.exec();