You can send TVM_CREATEDRAGIMAGE to the tree view control to tell it to create a default drag image from the image that is currently used by the item that will be dragged.

• 你也可以发送TVM_CREATEDRAGIMAGE消息给树视图控件，用来告诉它，从那个被拖动的选项当前使用的图像中创建一个自定义的拖动图像。