在Mac上运行ip4服务器

Question

I'm using some code from Jan Newmarch's book on Go to run a daytime server on my mac. It uses this code

func main() {

        service := ":1200"
        tcpAddr, err := net.ResolveTCPAddr("ip4", service)
        checkError(err)

        listener, err := net.ListenTCP("tcp", tcpAddr)
        checkError(err)

however, when I run it (on a Mac), I get this error

Fatal error: unknown network ip4

Is there anything other than ip4 that I can include in this code to avoid that error?

tcpAddr, err := net.ResolveTCPAddr("ip4", service)

Note, I also tried ip6 and got the same error.

Answer 1

According to the documentation for ResolveTCPAddr the only valid values for the net arg are "tcp", "tcp4" and "tcp6"

I suspect you're getting mixed up between ResolveTCPAddr and ResolveIPAddr