I don't understand the question. Please Elaborate on what you want to do... I guess #q293714 is a duplicate?

Yes.I try to put this code (simpeActionClient) into the move_base node.I define in move_base ac_=new MoveBaseClient( "/move_base", true); But I get an error: cannot convert ‘move_base::MoveBaseClient* to ‘move_base::MoveBaseActionServer.

are you sure this is ac_ = new ... and not as_ = new ...? Please also Elaborate about the "why" of your Task, to avoid a possible xy-Problem.

okey.Thanks for attention.I try to put MoveBaseClient into move_base node.My aim is to send a goal from another service(also in move_base)to the MoveBaseClient and it will transfer this goal to the MoveBaseActionServer.The above problem was a misspelling problem I solved,but I system still not works

I hope this explanation was clear. Basically, I try to put MoveBaseClient and MoveBaseActionServer in a same node.