QT中用label标签添加图片

void ScrollArea::set_image(char *filename)

{

QImage *ppm = new QImage(filename)

label = new QLabel()

printf("ppm->width()=%d, ppm->height()=%d\n",ppm->width(), ppm->height())//获取图片的宽度和高度

label->setPixmap(QPixmap::fromImage(*ppm))

this->setWidget(label)

/*设置窗口最大高度和宽度为1024*768*/

this->setMaximumHeight(768)

this->setMaximumWidth(1024)

this->resize(QSize( ppm->width()+5, ppm->height() +5))

return

}

//假如label的名称是show_label

void xx::show(const QSt//假如label的名称是show_label

void xx::show(const QString &file)

{

QPixmap pix

pix.load(file)

pix=pix.scaled(ui->show_label->width(),ui->show_label->height())

ui->show_label->setPixmap(fix)

}

int main()

{

show(tr("./images/open.png"))//显示/images/open.png的图片

return 0

}

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