这是一个用图片做背景的对话框程序，但是，这个对话框的形状是不规则的，是根据图片的形状定义的，图片是什么形状，对话框就是什么形状-This is a picture as the background of the dialog box procedure, however, the irregular shape of this dialog box is defined according to the shape of the picture, the picture is what sha