在Go编程中无法通过TCP发送gob数据 [英] Unable to send gob data over TCP in Go Programming
问题描述
我有一个客户端服务器应用程序,使用TCP连接
客户端:
type Q struct {
sum int64
}
type P struct {
M,N int64
}
func main(){
...
//读取M和N
...
tcpAddr,err:= net.ResolveTCPAddr(tcp4,service)
...
var p P
pM = M
pN = N
err = enc.Encode(p)
}
服务器:
类型Q struct {
sum int64
}
type P struct {
M,N int64
}
func main (){
...
tcpAddr,err:= net.ResolveTCPAddr(ip4,service)
监听器,err:= net.ListenTCP(tcp,tcpAddr)
...
var connB bytes.Buffer
dec:= gob.NewDecoder(& connB)
var p P
err = dec.Decode(p)
fmt.Printf({%d,%d} \\\
,pM,pN)
}
结果o n serve是{0,0},因为我不知道如何从 net.Conn $ c $获取
bytes.Buffer
变量c>。
有没有办法通过TCP发送gob变量?
如果这是真的,这怎么能做完了 ?或者在通过TCP发送数字时有其他选择吗?
任何帮助或示例代码都会真正赞赏。
>解决方案这是一个完整的示例。
服务器:
$ b package main
import(
fmt
net
encoding / gob
)
类型P struct {
M,N int64
}
func handleConnection(conn net.Conn){
dec:= gob .NewDecoder(conn)
p:=& P {}
dec.Decode(p)
fmt.Printf(Received:%+ v,p);
conn.Close()
}
func main(){
fmt.Println(start);
ln,err:= net.Listen(tcp,:8080)
if err!= nil {
//处理错误
}
for {
conn,err:= ln.Accept()//这会阻塞直到连接或错误
if err!= nil {
//处理错误
继续
}
go handleConnection(conn)//一个goroutine处理conn,以便循环可以接受其他连接
$ b $ <$ code>
客户:
package main
进口(
fmt
记录
净
编码/采样
)
类型P struct {
M,N int64
}
func main(){
fmt.Println(start client);
conn,err:= net.Dial(tcp,localhost:8080)
if err!= nil {
log.Fatal(Connection error,err)
encoder:= gob.NewEncoder(conn)
p:=& P {1,2}
encoder.Encode(p)
conn.Close()
fmt.Println(完成);
}
启动服务器,然后是客户端,然后您会看到显示接收的服务器P值。
有几点意见要说清楚:
Conn
实现 Reader
和 Writer
接口,这使它易于使用:您可以将它提供给解码器
或 Encoder
P
两个程序导入的程序包中的结构定义
I have a client server application, using TCP connection
Client:
type Q struct {
sum int64
}
type P struct {
M, N int64
}
func main() {
...
//read M and N
...
tcpAddr, err := net.ResolveTCPAddr("tcp4", service)
...
var p P
p.M = M
p.N = N
err = enc.Encode(p)
}
Server:
type Q struct {
sum int64
}
type P struct {
M, N int64
}
func main() {
...
tcpAddr, err := net.ResolveTCPAddr("ip4", service)
listener, err := net.ListenTCP("tcp", tcpAddr)
...
var connB bytes.Buffer
dec := gob.NewDecoder(&connB)
var p P
err = dec.Decode(p)
fmt.Printf("{%d, %d}\n", p.M, p.N)
}
The result on serve is {0, 0} because I don't know how to obtain a bytes.Buffer
variable from net.Conn
.
Is there any way for sending gob variables over TCP ?
If true, how can this be done ? Or there are any alternative in sending numbers over TCP ?
Any help or sample code would really be appreciated.
Here's a complete example.
Server:
package main
import (
"fmt"
"net"
"encoding/gob"
)
type P struct {
M, N int64
}
func handleConnection(conn net.Conn) {
dec := gob.NewDecoder(conn)
p := &P{}
dec.Decode(p)
fmt.Printf("Received : %+v", p);
conn.Close()
}
func main() {
fmt.Println("start");
ln, err := net.Listen("tcp", ":8080")
if err != nil {
// handle error
}
for {
conn, err := ln.Accept() // this blocks until connection or error
if err != nil {
// handle error
continue
}
go handleConnection(conn) // a goroutine handles conn so that the loop can accept other connections
}
}
Client :
package main
import (
"fmt"
"log"
"net"
"encoding/gob"
)
type P struct {
M, N int64
}
func main() {
fmt.Println("start client");
conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
log.Fatal("Connection error", err)
}
encoder := gob.NewEncoder(conn)
p := &P{1, 2}
encoder.Encode(p)
conn.Close()
fmt.Println("done");
}
Launch the server, then the client, and you see the server displaying the received P value.
A few observations to make it clear :
- When you listen on a socket, you should pass the open socket to a goroutine that will handle it.
Conn
implements theReader
andWriter
interfaces, which makes it easy to use : you can give it to aDecoder
orEncoder
- In a real application you would probably have the
P
struct definition in a package imported by both programs
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