QT中使用opencv加载图片使用label显示

QString fileName=QFileDialog::getOpenFileName(this,tr("fileDialog"),"C:",tr("img(*png *jpg)"));
    string srcname;
    QTextCodec *code=QTextCodec::codecForName("gb18030"); //支持中文
    srcname=code->fromUnicode(fileName).data();
    srcmat=imread(srcname,1);  //读取图片文件
    Mat srcmat2;
    cvtColor(srcmat,srcmat2,CV_BGR2RGB);
    QImage img =QImage((const unsigned char*)srcmat2.data, // uchar* data
            srcmat2.cols, srcmat2.rows, // width height
            srcmat2.step,
            QImage::Format_RGB888); //format
 
    QImage dstimg=img.scaled(ui->label->size());

以上来自https://blog.csdn.net/jialeheyeshu/article/details/51445893