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Qt如何在控制台项目中使用opencv打开视频

news 2025/9/17 0:17:37

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 serialportCONFIG += 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 6.0.0SOURCES += \main.cppwin32{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_OBJECTpublic: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"