特殊形状窗口，根据位图，比如将位图中RGB(255, 0, 255)色去掉，保留剩下的位图形状，将该形状应用于对话框窗口，使窗口个性化-special shape of the window, bitmap, for example- will map RGB (255, 0, 255) remove color, retain the remaining bitmap shape, the shape used in this dialog window, the window of pers