<分区>
我有一个使用 Qt 和 OpenCV 的网络摄像头演示。基本上它会显示网络摄像头的提要，当单击按钮时，它会启动一个长线程(三到五秒)的线程。
问题是 QImage 立即损坏了 as you can see here当我单击按钮时，我再也看不到视频源了。信号和插槽工作(我在控制台中看到输出)，但我无法在此处发现问题。
有人能帮忙吗？
window::window() : QMainWindow(NULL, 0)
{
std::cout << "constructor start" << std::endl;
setWindowTitle("Video");
button = new QPushButton("Long Job");
connect(button, SIGNAL(clicked()), this, SLOT(longjob()));
image = new QLabel();
image->setAlignment(Qt::AlignCenter);
layout = new QVBoxLayout();
layout->addWidget(image);
layout->addWidget(button);
mainwidget = new QWidget();
mainwidget->setLayout(layout);
resize(800, 600);
setCentralWidget(mainwidget);
cap = cv::VideoCapture(0);
timer = new QTimer();
timer->setInterval(100);
timer->start();
connect(timer, SIGNAL(timeout()), this, SLOT(newframe()));
std::cout << "constructor end" << std::endl;
}
void window::newframe()
{
std::cout << "FRAME " << count++ << std::endl;
cv::Mat frame;
cap >> frame;
image->setPixmap(QPixmap::fromImage(showImage(frame))); // converts perfectly
}
void window::longjob()
{
std::cout << "START THREAD" << std::endl;
w = new worker();
connect(w, SIGNAL(resultReady(double)), this, SLOT(detected(double)));
w->start();
return;
}
void window::detected(double d)
{
disconnect(w, SIGNAL(resultReady(double)), this, SLOT(detected(double)));
std::cout << "DETECTED " << d << std::endl;
delete w;
frames.clear();
}
class worker : public QThread
{
Q_OBJECT
public:
worker();
~worker();
void run() Q_DECL_OVERRIDE;
signals:
void resultReady(double d);
};
worker::worker() : QThread()
{
}
worker::~worker()
{
std::cout << "THREAD EXIT" << std::endl;
}
void worker::run()
{
std::cout << "THREAD RUN" << std::endl;
double d = longOpenCVJob();
emit resultReady(d);
}