On Sun, Nov 12, 2017, 10:03 AM Justin Israel <justinisr...@gmail.com> wrote:
>
>
> On Sat, Nov 11, 2017, 9:55 PM <2891132l...@gmail.com> wrote:
>
>> this is the server program：
>>
>>> package main
>>>
>>> import (
>>> "fmt"
>>> "net"
>>> "os"
>>>
>> "strings"
>>> )
>>>
>>> func main() {
>>>
>>> listener, err := net.Listen("tcp", "0.0.0.0:400")
>>>
>> 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]))
>>>
>> n, err2 := conn.Write([]byte("welcome client!"))
>>>
>> if err2 != nil {
>>> return
>>> }
>>>
>> aa := string("nice to meet you")
>>> if strings.Contains(string(buf[0:n]), aa) {
>>> n, err2 = conn.Write([]byte("nice to meet you too"))
>>>
>> if err2 != nil {
>>> return
>>> }
>>> }
>>> }
>>> }
>>> func checkError(err error) {
>>> if err != nil {
>>> fmt.Fprintf(os.Stderr, "fatal error: %s", err.Error())
>>> os.Exit(1)
>>> }
>>> }
>>>
>>
>>>
>> this is the client program:
>> 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\n", os.Args[0])
>> }
>> _, err := net.ResolveTCPAddr("tcp", "127.0.0.1:400")
>> checkError(err)
>> conn, err := net.Dial("tcp", "127.0.0.1:400")
>> checkError(err)
>> rAddr := conn.RemoteAddr()
>> n, err := conn.Write([]byte("hello server!"))
>> checkError(err)
>> n, err = conn.Write([]byte(" nice to meet you"))
>> checkError(err)
>> n, err = conn.Read(buf[0:])
>> if err != nil {
>> return
>> }
>> 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(1)
>> }
>> }
>>
>>
>> Just a little change and I run it successfully.But I am doubt why it
>> can't print "nice to meet you too"?？And how to solve it??
>>
>
> Your server does the following on a new connection
>
> n, err := conn.Read(buf[0:])
> ...
> n, err2 := conn.Write([]byte("welcome client!"))
>
> Then your client is doing the following on the start of the connection
>
> n, err := conn.Write([]byte("hello server!"))
> ...
>
> n, err = conn.Write([]byte(" nice to meet you"))
>
> Both the client and server are blocking on writing and no one is doing any
> reading. Make sure your client does a read after elderly
>
Thanks autocorrect. I have no problem with the elderly, but it has no
business here in this response.
successful write, if you are choosing to do a request/reply pattern.
>
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>
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