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I want to get coordinate X/Y from image, how to use setmousecallback opencv in button winforms? Thank you

I want to get coordinate X/Y from image, how to use setmousecallback opencv in button winforms? Thank youyou Button code : private: System::Void b_SAsel_Click(System::Object^ sender, System::EventArgs^ e) { namedWindow("Display window", 0); Mat img = imread("PIC 1.jpg"); setMouseCallback("Display window", mouseHandler, &img); }

I want to get coordinate X/Y from image, how to use setmousecallback opencv in button winforms? Thank you Button code : :

private: System::Void b_SAsel_Click(System::Object^  sender, System::EventArgs^  e) {
              namedWindow("Display window", 0);
              Mat img = imread("PIC 1.jpg");
              setMouseCallback("Display window", mouseHandler, &img);
    }}

mousehandler code :

static void mouseHandler(int event, int x, int y, int, void* imgptr){
    Point2f coordinate[30][30];
    int temp;

    RNG rng(12345);
    cv::Point pts[30];
    Mat shape, kontur;
    Mat res;

    if (event != 1) return;
    Mat & img = (*(Mat*)imgptr);
    cv::Point pt1 = cv::Point(x, y);
    temp++;
    pts[temp - 1] = cv::Point(x, y);
    cout << temp << endl;
    coordinate[temp][0] = Point2f(float(x), float(y));
    img.copyTo(shape);
    img.copyTo(kontur);
    .................
        ...........
}