说明：  vc++ 获得指定像素点的颜色，如演示截图所示，用户可以用鼠标左键单击图片的某一处时，就会在图片的右侧以该点颜色填充一个实心的矩形。实现方法通过函数COLORREF CDC::GetPixel( int x, int y)可以得到指定点的颜色，其参数x、y 是指定点的坐标
(When vc++ for the specified pixel color, as shown in the screenshot demonstrates, the user can use the left mouse button, click the image one place, will be in the right side of the picture to the point of a solid color fill rectangle. Implementation by the function COLORREF CDC :: GetPixel (int x, int y) can be color specified point, the parameters x, y coordinates of the specified point)