I try to modify the program,but the result is: host:portfatal error: dial
tcp 192.168.153.239:5000: connectex: No connection could be made because
the target machine actively refused it.exit status 1.How to solve it??
在 2017年11月6日星期一 UTC+8下午5:08:26，rog写道：
> On 30 October 2017 at 06:55, <28911...@gmail.com <javascript:>> wrote:
> > I write this code in the follwings:
> > package main
> >
> > import (
> > "fmt"
> > "net"
> > "os"
> > )
> >
> > func main() {
> > service := ":5000"
> > tcpAddr, err := net.ResolveTCPAddr("tcp", service)
> > checkError(err)
> > listener, err := net.ListenTCP("tcp", tcpAddr)
> > checkError(err)
> > for i := 0; i < 10; i++ {
> > conn, err := listener.Accept()
> > if err != nil {
> > continue
> > }
> > handleClient(conn)
> > conn.Close()
> > }
> > }
> > func handleClient(conn net.Conn) {
> > var buf [512]byte
> > for {
> > n, err := conn.Read(buf[0:])
> > if err != nil {
> > return
> > }
> > rAddr := conn.RemoteAddr()
> > fmt.Println("receive from client", rAddr.String(), string(buf[0:n]))
> > _, err2 := conn.Write([]byte("welcome client!"))
> > if err2 != nil {
> > return
> > }
> > }
> > }
> > func checkError(err error) {
> > if err != nil {
> > fmt.Fprintf(os.Stderr, "fatal error: %s", err.Error())
> > os.Exit(1)
> > }
> > }
> >
> >
> > I try to run it in Sublime Text3 but it has no reaction and I try to run
> it
> > in running windows, it shows:
> > fatal error: lsiten tcp:5000:bind:Only one usage of each socket
> > address(protocol/network address/port) is normally permitted.exit status
> 1
>
> From that error message, I suspect that you already have a running
> instance
> of your program - as the message says, you are only allowed to listen
> on a port once.
>
> To avoid that, you could listen on port zero, which will choose an
> arbitrary
> port (but then you'll need to print out the port number so that you can
> know which port to use on the client).
>
> By the way, your code is a little bit more complex than
> it needs to be. Instead of this:
>
> > service := ":5000"
> > tcpAddr, err := net.ResolveTCPAddr("tcp", service)
> > checkError(err)
> > listener, err := net.ListenTCP("tcp", tcpAddr)
>
> You could do:
>
> service := ":5000"
> listener, err := net.Listen("tcp", tcpAddr)
>
> Similarly when dialing - there's no need to call ResolveTCPAddr
> explicitly (and it's actually not as good if you do that,
> because Dial will automatically use multiple IP addresses
> if it needs to, but if you use ResolveTCPAddr, it can only use one).
>
> Hope this helps,
>
> rog.
>
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