QT+opencv显示图片小程序窗体版

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QtWidgets/QMainWindow> #include <QFileDialog> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <opencv2/core/core.hpp> using namespace cv; using namespace std; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_closeButton_clicked() { close(); } void MainWindow::on_openButton_clicked() { img_name = QFileDialog::getOpenFileName( this, tr("Open Image"), ".",tr("Image Files(*.png *.jpg *.jpeg *.bmp)")); //QTextCodec *code = QTextCodec::codecForName("gb18030"); // std::string name = code->fromUnicode(img_name).data(); // QTextCodec *code = QTextCodec::codecForName("gb18030"); // std::string name = code->fromUnicode(img_name).data(); if(img_name.length()<=0)return; //imread的第二个参数：读取4通道的png图像。其中第四个通道的数据类型和其他通道的一样，都是uchar型，完全透明为0，否则为255 src=imread(img_name.toUtf8().data()); //toAscii()返回8位描述的string,为QByteArray,data()表示返回QByteArray的指针，QByteArray为字节指针 //src = imread("girl.jpg"); namedWindow( "src", WINDOW_NORMAL ); if(!src.empty()){ imshow("src",src); } cvtColor( src, src, CV_BGR2RGB ); img = QImage( (const unsigned char*)(src.data), src.cols, src.rows, QImage::Format_RGB888 ); ui->label->setPixmap( QPixmap::fromImage(img)); ui->label->resize( ui->label->pixmap()->size()); }