Reputation: 42049
The code below is from Jan Newmarch's book about network programming in Go. In most of the Go code that I've seen (which is very little, as I'm a newbie, you don't (in a function call) pass a type with a parameter. However, in the code below, you see this line
conn.Write([]byte(daytime))
Why is it necessary to include []byte
in this function call?
func main() {
service := ":1200"
tcpAddr, err := net.ResolveTCPAddr("ip4", service)
checkError(err)
listener, err := net.ListenTCP("tcp", tcpAddr)
checkError(err)
for {
conn, err := listener.Accept()
if err != nil {
continue
}
daytime := time.Now().String()
conn.Write([]byte(daytime))
Upvotes: 1
Views: 81
Reputation: 2023
Conn.Write()
expects the value as a byte slice. Since daytime
is of type string you have to convert it.
You could rewrite the above as:
daytime := []byte(time.Now().String())
conn.Write(daytime)
Or, as @fabrizioM writes, you could use the formatted writer which would convert it:
fmt.Fprintf(conn, daytime)
Upvotes: 3
Reputation: 33
Because the data being transferred between server and client is byte.
The daytime in your case is obviously string format.
So you have to convert it into byte by using []byte(daytime).
Either way, you could import "bufio" to create a NewWriter for each client, and the NewWriter
will have the methods WriteString(""). At this moment, you could directly pass your daytime
as a parameter~
Upvotes: 0