QT Label显示图像

直接上代码：

Mat srcImg;////////////////////////////void MainWindow::paintEvent(QPaintEvent *e){    QImage image = QImage((uchar*)(srcImg.data), srcImg.cols, srcImg.rows, QImage::Format_RGB888);    ui->imgLabel->setPixmap(QPixmap::fromImage(image));    ui->imgLabel->resize(image.size());    ui->imgLabel->show();}