Sorry, the last program is about server.and the following program is about
the client:
package main
import (
"fmt"
"net"
"os"
)
func main() {
var buf [512]byte
if len(os.Args) != 2 {
fmt.Fprintf(os.Stderr, "usage:%s host:port", os.Args[0])
}
service := os.Args[1]
tcpAddr, err := net.ResolveTCPAddr("tcp", service)
checkError(err)
conn, err := net.DialTCP("tcp", nil, tcpAddr)
checkError(err)
rAddr := conn.RemoteAddr()
n, err := conn.Write([]byte("hello server!"))
checkError(err)
n, err = conn.Read(buf[0:])
checkError(err)
fmt.Println("reply from server", rAddr.String(), string(buf[0:n]))
conn.Close()
os.Exit(0)
}
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "fatal error: %s", err.Error())
os.Exit(0)
}
}
the questoin is how to make the client communicate with the server??I want
to see the message can be showed on the screen. Can these programs run in
the same computer??if so,How to make it??
在 2017年10月30日星期一 UTC+8下午2:55:27，28911...@gmail.com写道：
> 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
>
>
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