OpenCV?QT?????

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OpenCV?????????GUI?????????????????????????????GUI????????????????Qt?????OpenCV????????

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?QtCreator???????QMainWindow?????????????QImageShowWidget?????????????QMainWindow?centralwidget??

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#ifndef QIMAGESHOWWIDGET_H#define QIMAGESHOWWIDGET_H#include 
   
    #include 
    
     class QImageShowWidget : public QWidget{    Q_OBJECTpublic:    explicit QImageShowWidget(QWidget *parent = nullptr);    ~QImageShowWidget();    bool LoadImage(const char *imagePath);protected:    void paintEvent(QPaintEvent *event);    void Release();    private:    uchar *winBuf;    int winWidth;    int winHeight;    int winBandNum;};#endif // QIMAGESHOWWIDGET_H

source??

#include "qimageshowwidget.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       using namespace cv;using namespace std;QImageShowWidget::QImageShowWidget(QWidget *parent) : QWidget(parent){    setAutoFillBackground(true);    setBackgroundRole(QPalette::Base);    winBuf = nullptr;    winWidth = rect().width();    winHeight = rect().height();    winBandNum = 3;}QImageShowWidget::~QImageShowWidget(){    if (winBuf)    {        delete[] winBuf;        winBuf = nullptr;    }}bool QImageShowWidget::LoadImage(const char *imagePath){    Mat img = imread(imagePath);    if (img.empty())    {        fprintf(stderr, "Can not load image %s\n", imagePath);        return false;    }        Release();    winWidth = rect().width();    winHeight = rect().height();    size_t winBufNum = (size_t)winWidth * winHeight * winBandNum;    winBuf = new uchar[winBufNum];    memset(winBuf, 255, winBufNum * sizeof(uchar));        for (int ri = 0; ri < img.rows; ++ri)    {        for (int ci = 0; ci < img.cols; ++ci)        {            for (int bi = 0; bi < winBandNum; ++bi)            {                size_t m = (size_t)winWidth * winBandNum * ri + winBandNum * ci + bi;                size_t n = (size_t)img.cols * winBandNum * ri + winBandNum * ci + bi;                winBuf[m] = img.data[n];            }        }    }        update();    return true;}void QImageShowWidget::paintEvent(QPaintEvent *event){    if (!winBuf)    {        return;    }        QImage::Format imgFormat = QImage::Format_RGB888;    QPainter painter(this);    QImage qImg(winBuf, winWidth, winHeight, winWidth * winBandNum, imgFormat);    painter.drawPixmap(0, 0, QPixmap::fromImage(qImg));}void QImageShowWidget::Release(){    if (winBuf)    {        delete[] winBuf;        winBuf = nullptr;    }}