Hi Arash,
There are two ways in which you may achieve the mentioned task:
1) You may call the GetOnlineUsers API which will give you the list of all live users.And then for each live user, you may call the GetLiveUserInfo API from where you can get the location id of the user which is the room id of the joined room if the user has joined a room.So you will come to know if the user has joined a room or not.
2) Or you may call the GetOnlineUsers API,get the list of all live users,call the GetLiveRoomInfo API for each live room while passing the room id of that room.From here you will get the list of all the users who have joined that room.
Thanks,
Kanika Mittal
AppWarp Team