C#獲取屏幕鼠標座標點顏色

[DllImport( "user32.dll" )]         private  static extern IntPtr GetDC(IntPtr hwnd);           [DllImport( "gdi32.dll" )]         private  static extern int GetPixel(IntPtr hdc, Point p);           public  static Color getColor(Point p)         {               // Point p = new Point(MousePosition.X, MousePosition.Y);//取置頂點座標             IntPtr hdc = GetDC( new  IntPtr(0));//取到設備場景(0就是全屏的設備場景)             int  c = GetPixel(hdc, p);//取指定點顏色             int  r = (c & 0xFF);//轉換R             int  g = (c & 0xFF00) / 256;//轉換G             int  b = (c & 0xFF0000) / 65536;//轉換B             // pictureBox1.BackColor = Color.FromArgb(r, g, b);             return  Color.FromArgb(r, g, b);           }

　　測試例子：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

private  void button1_Click(object sender, EventArgs e) {      //測試X在200，Y在120 到500 的顏是否不等於 Color.FromArgb(255, 246, 246, 246);      string  d = DateTime.Now.ToLongTimeString();      Color cl = Color.FromArgb(255, 246, 246, 246);      Point p =  new  Point(200,0);     for  (int h = 120; h < 500; h+=8) {          p.Y = h;        if (getColor(p).Equals(cl)== false  ){              Text = "" + h;         break ;       }        }            Text = d + ":" +  DateTime.Now.ToLongTimeString() + "  " + p ;   }