package main
import (
"fmt"
"log"
"net"
"sync"
"time"
)const(
address = "localhost:502"
)//方法的巢狀！！！！！！！！！！！！！！！！！！！！！！！！！
func main() tcptransporter: conn:closetimer:lastactivity:}}
/*結構體*tcpclienthandler賦值給介面clienthandler*/
//指標物件賦值給介面，介面方法必須是指標物件方法
newclient(handler) /*初始化tcpclienthandler物件*/
/*newclient(handler).readholdingregisters()*/
}type packager inte***ce
// transporter specifies the transport layer.
type transporter inte***ce
type sclient struct
type clienthandler inte***ce
func newclient(handler clienthandler) client /*返回該介面物件*/
/*將物件handler賦值給介面packager後，此時packager=物件了*/
/*將結構體&sclient賦值給介面client裡面都是對讀寫方法的定義可以都不寫*/
}type client inte***ce
func newtcpclienthandler(address string) *tcpclienthandler //結構體是非引用傳遞，需要指標物件
h.address = address //ip位址+埠
h.timeout = tcptimeout
h.idletimeout = tcpidletimeout
return h
}const (
tcpprotocolidentifier uint16 = 0x0000
tcpheadersize = 7
tcpmaxlength = 260
// default tcp timeout is not set
tcptimeout = 10 * time.second
tcpidletimeout = 60 * time.second
)// tcppackager implements packager inte***ce.
type tcppackager struct
// tcptransporter implements transporter inte***ce.
type tcptransporter struct
// tcpclienthandler implements packager and transporter inte***ce.
type tcpclienthandler struct
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