Qt如何在控制台项目中使用opencv打开视频

Qt如何在控制台项目中使用opencv打开视频？
重要代码：
1、在pro文件中这样设置：
QT -= gui
QT += core widgets serialport
2、不要继承和使用：QCoreApplication
#include

pro文件：

```cpp
QT -= gui
QT += core widgets serialport

CONFIG += c++11 console
CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        main.cpp

win32{
    INCLUDEPATH += D:/opencv4.1.2/build/install/include/ \
                   C:/Boost/include/boost-1_70/

    LIBS += D:/opencv4.1.2/build/install/x86/mingw/bin/libopencv_*.dll \
            C:/Boost/lib/libboost_*-mgw53-mt-d-x32-1_70.a
}
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

#include <QApplication>
#include <QSerialPort>
#include <QByteArray>
#include <QImage>
#include <QBuffer>
#include <opencv2/opencv.hpp>
#include <QDebug>
#include <QTimer>

class Server : public QApplication
{
    Q_OBJECT

public:
    Server(int &argc, char **argv);
    ~Server();

public slots:
    void startCapture();
    void stopCapture();
    void sendDataToClient();

private:
    QSerialPort *serialPort;
    cv::VideoCapture videoCapture;
    QTimer *timer;
};

Server::Server(int &argc, char **argv)
    : QApplication(argc, argv),
      serialPort(new QSerialPort(this)),
      timer(new QTimer(this))
{
    // 设置串口参数
    serialPort->setPortName("COM2");
    serialPort->setBaudRate(QSerialPort::Baud9600);
    serialPort->setDataBits(QSerialPort::Data8);
    serialPort->setParity(QSerialPort::NoParity);
    serialPort->setStopBits(QSerialPort::OneStop);

    // 打开默认摄像头
    // 打开网络摄像头的RTSP流
    QString rtspUrl = "rtsp://admin:abcd1234@192.168.2.174:554/h264/ch1/sub/av_stream";  // 替换为实际的摄像头IP和端口
    videoCapture.open(rtspUrl.toStdString());

    // 连接定时器信号
    connect(timer, &QTimer::timeout, this, &Server::sendDataToClient);

    // 连接OpenCV的读取完成信号
    connect(this, &Server::aboutToQuit, this, &Server::stopCapture);
}

Server::~Server()
{
    delete serialPort;
    delete timer;
}

void Server::startCapture()
{
    if (!videoCapture.isOpened())
    {
        qDebug() << "Error: Unable to open the camera.";
        return;
    }

    // 启动定时器，每隔一段时间发送视频帧到客户端
    timer->start(1);  // 每100毫秒触发一次定时器
}

void Server::stopCapture()
{
    timer->stop();
    videoCapture.release();
}

void Server::sendDataToClient()
{
    cv::Mat frame;
    videoCapture.read(frame);

    if (!frame.empty())
    {

        cv::imshow("123",frame);
        // 将 OpenCV Mat 转换为 Qt 图像
        QImage image(frame.data, frame.cols, frame.rows, frame.step, QImage::Format_RGB888);
        QByteArray imageData;
        QBuffer buffer(&imageData);
        buffer.open(QIODevice::WriteOnly);
        image.save(&buffer, "JPEG"); // 将图像保存为JPEG格式
        buffer.close();

        // 发送数据到客户端
        if (serialPort->isOpen() && serialPort->isWritable())
        {
            std::cout<<"send.....2!"<<std::endl;
            serialPort->write(imageData);
            serialPort->waitForBytesWritten();
        }
    }
}

int main(int argc, char *argv[])
{
    Server server(argc, argv);

    // 处理命令行参数，启动视频捕获等

    server.startCapture(); // 启动视频捕获

    return server.exec();
}

#include "main.moc"