How to get the RGB value of the XY coordinates of an image using opencv?

Question

C++ / C#

All libraries are connected correctly, at least they work.

Here is the code:

int main(){
        Mat image  = imread("C:\\png\\1.jpg");
  Point3_<uchar>* p = image.ptr<Point3_<uchar> >(1, 1);
  cout << "RGB:  " << p->z << "  " << p->y << "  " << p->x;
  return 0;
}

Is there some mistake?
And what is "->";

Here is the image, jpg format:

Answer 1

This?