从Go中的列表中打印列表。 循环麻烦

Question

Trying to print a list of routes from within a network namespace. The netlink.RouteList function requires an Interface type. A list of all interfaces is gathered by LinkList().

I'm trying to call RouteList with every interface and print it's output. RouteList returns type Route where I'm trying to print the int LinkIndex.

It appears as if my loop

  for j := range rt {
    log.Printf("Route: %d : %d",rt[j].LinkIndex)
  }

Isn't executing for some reason, running another Printf test in there yields nothing.

Why wouldn't this loop be called?

func (h *NSHandle) showInts() {
  nh := (*netlink.Handle)(h) //cast required
  int, err := nh.LinkList()
  if err != nil {
      log.Fatal(err)
  }
  log.Printf("Namespace Ints:")
  for i, r := range int {
      log.Printf("%d: %s", i, r.Attrs().Name)
      rt, err := netlink.RouteList(r,-1)
      if err != nil {
        log.Fatal(err)
      }
      for j := range rt {
        log.Printf("Route: %d : %d",rt[j].LinkIndex)
      }
  }
}

Answer 1

This was a bad question. Soon after posting I had realised that the array was obviously empty due to the fact that RouteList was being called without the receiver Handler. This was fixed by simply:

for i, r := range rl {
    log.Printf("%d: %s", i, LinkIndex)
  }