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how to get the serviceID belongs to airport
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how to get the serviceID belongs to airport

  • Subject: how to get the serviceID belongs to airport
  • From: "Cotton Chen" <email@hidden>
  • Date: Wed, 7 Feb 2007 09:46:13 +0800
Hi all,
    Recently I'd like to get the dhcp server's ip address who gives the ip to my airport.
    I used the APIs SCDynamicStoreCopyDHCPInfo, and  DHCPInfoGetOptionData to accomplish my purpose.
    But, I cand only pass the NULL value as the serviceID to SCDynamicStoreCopyDHCPInfo because I don't know how to get the serviceID that belongs to airport.
    I also used scutil to get the informations about dhcp, I got the following of what I want.

  with ethernet cable connected:
  subKey [47] = State:/Network/Service/0/DHCP
  subKey [48] = State:/Network/Service/0/DNS
  subKey [49] = State:/Network/Service/0/IPv4
  subKey [50] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/DHCP
  subKey [51] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/DNS
  subKey [52] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/IPv4

  without ethernet cable connected:
  subKey [50] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/DHCP
  subKey [51] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/DNS
  subKey [52] = State:/Network/Service/606C990F-4091-4AC1-807F-86CC64EB7898/IPv4


  as I passed the null value as serviceID to SCDynamicStoreCopyDHCPInfo without ethernet cable connected and turn on the airport interface, I got the correct dhcp server's ip because system had no choice to return me the one belongs to airport. But after I connected the ethernet cable on my computer, I always got the one that belongs to the ethernet interface.
  My question is, how to get the serviceID belongs to airport, for example the string "606C990F-4091-4AC1-807F-86CC64EB7898" that listed above.

--
Cotton Chen 


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