1.声明
public slots:
void showImage();
2.使用
connect(ui.openfile, SIGNAL(clicked()), SLOT(showImage())); //点击事件
3.实现
void QtGuiApp01::showImage()
{
QString filename = QFileDialog::getOpenFileName(this,
tr("open image"),
".",
tr("Image file(*.png *.jpg *.bmp)"));
cv::Mat image = imread(filename.toLocal8Bit().data());
QImage img = QImage((const unsigned char*)(image.data), image.cols, image.rows, QImage::Format_RGB888);
//设定图像大小自适应label窗口的大小
img = img.scaled(ui.labelImg->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
ui.labelImg->setPixmap(QPixmap::fromImage(img));
}
