opencv如何实现【不用全局变量进行滚动条控制】

#include <opencv2/opencv.hpp>
using namespace cv;
namespace ycv {
    class Win {
    public:
        Win(string name,int type);
        void imshow(Mat &img);
        string name;
    };

}
namespace ycv {
    Win::Win(string name, int type) {
        this->name = name;
        namedWindow(this->name, type);
    }
    void Win::imshow(Mat &img) {
        cv::imshow(this->name,img);
    }
}


void on_Trackbar(int par1, void *pvoid)
{
    static void *p1 = (void*)(*(0+((int*)pvoid)));
    static void *p2 = (void*)(*(1 + ((int*)pvoid)));
    static void *p3 = (void*)(*(2 + ((int*)pvoid)));
    std::string *winname = (std::string*)p1;
    Mat *mgray = (Mat*)p2;
    Mat *mbin = (Mat*)p3;
    adaptiveThreshold(*mgray, *mbin, 255,
        CV_ADAPTIVE_THRESH_MEAN_C, CV_THRESH_BINARY, 
        par1>1 ? (par1%2==1 ? par1 : par1+1) : 3, 11);
    imshow(*winname, *mbin);
}
int main(int argc, char** argv)
{
    ycv::Win w1 = ycv::Win("窗口1", CV_WINDOW_NORMAL);
    Mat mgray = imread("1.jpg");
    Mat mbin;
    cvtColor(mgray, mgray, CV_BGR2GRAY);
    if (!mgray.data) { 
        std::cout << "read error\n" << std::endl;
        return -1;
    }

    int gs = 71;
    createTrackbar("滑动条1", w1.name, &gs, 333, on_Trackbar);
    int *p[3];
    p[0] = (int*)&w1.name;
    p[1] = (int*)&mgray;
    p[2] = (int*)&mbin;
    on_Trackbar(gs, p);
    waitKey();

    return 0;
}