视频流在dlib gui_widget中显示到图形用户界面

Question

我是C ++代码的新手。

我正在将dlib gui_widget用于图形用户界面。我想做的是在image_display中显示摄像机流。我从cv :: VideoCapture cap（0）;获取摄像机流。我的方法是只显示流的第一帧。我知道流正在继续执行任务。

请告诉我如何更改代码。

我的简单代码在这里。

#include <memory>
#include <sstream>
#include <string>

#include <dlib/gui_widgets.h>
#include <dlib/string.h>
#include <dlib/opencv.h>
#include <opencv2/highgui/highgui.hpp>

using namespace std;
using namespace dlib;

class main_window : public drawable_window
{
public:
    main_window();
    ~main_window();

private:
    image_display drawF;
};

int WINAPI WinMain(HINSTANCE, HINSTANCE, PSTR cmds, int)
{
    main_window my_window;
    my_window.show();
    my_window.wait_until_closed();

    return 0;
}

main_window::main_window() : 
    drawF(*this)
{
    set_title("camera stream example");

    set_size(1000, 500);

    drawF.set_pos(20, 20);
    drawF.set_size(200, 200);

    cv::VideoCapture cap(0);
    if (cap.isOpened())
    {
        cv::Mat temp;
        if (cap.read(temp))
        {
            cv_image<bgr_pixel> cimg(temp);
            drawF.set_image(cimg);
        }
    }
    else
    {
        message_box("Problem", "Unable to connect to camera");
    }


    on_window_resized();
}

main_window::~main_window()
{
    close_window();
}

void main_window::on_window_resized()
{
    drawable_window::on_window_resized();

    unsigned long width, height;
    get_size(width, height);

    if (width < 500 || height < 350)
        return;

}