IOS 获取已连接的wifi信息的实现代码

+ (id)fetchssidinfo 
{ 
  nsarray *ifs = (id)cncopysupportedinterfaces(); 
  nslog(@"%s: supported interfaces: %@", __func__, ifs); 
  id info = nil; 
  for (nsstring *ifnam in ifs) { 
    info = (id)cncopycurrentnetworkinfo((cfstringref)ifnam); 
    nslog(@"%@ => %@", ifnam, info); 
    if (info && [info count]) { break; } 
    [info release]; 
  } 
  [ifs release]; 
  return [info autorelease]; 
} 

+ (id)fetchssidinfo { 
  nsarray *ifs = (__bridge_transfer id)cncopysupportedinterfaces(); 
  nslog(@"%s: supported interfaces: %@", __func__, ifs); 
  id info = nil; 
  for (nsstring *ifnam in ifs) { 
    info = (__bridge_transfer id)cncopycurrentnetworkinfo((__bridge cfstringref)ifnam); 
    nslog(@"%@ => %@", ifnam, info); 
    if (info && [info count]) { break; } 
  } 
  return info; 
}