在net.DialTCP中指定本地IP地址

Question

package main

import (
    "fmt"
    "net"
)

func main() {

    var localaddr net.TCPAddr
    var remoteaddr net.TCPAddr
    localaddr.IP = net.ParseIP("192.168.1.104")
    localaddr.Port = 6000
    remoteaddr.IP = net.ParseIP("192.168.1.104")
    remoteaddr.Port = 5000

    if localaddr.IP == nil || remoteaddr.IP == nil {
        fmt.Println("error")
    }

    if _, err := net.DialTCP("tcp", &localaddr, &remoteaddr); err != nil {
        fmt.Println(err)
    }

    fmt.Println("End")

}

If the function specify local IP address, it always reports a run time error "dial tcp 192.168.1.104:5000: An invalid argument was supplied." I'm confused, should it always be a nil for local IP address ?

go version : 1.1 Beta OS: Win7 64bit

Tried in go 1.0.3, it seemed OK

Answer 1

Go's net package, like most such implementations, recognizes port-only syntax for connecting to localhost:

:5000

is equivalent to

<my-ip-address>:5000

Thus, you can do:

net.Dial("tcp", ":5000")