On Sunday, 17 July 2016 21:42:26 UTC+3, EdgarAlejandro Vintimilla wrote:
>
> Hi, I have a GPS that sends me data through a connection TCP
>
> the data it sends me are in ASCII, and I have to convert it to HEX
>
> for example in python I'm doing this
>
> BUFFER_SIZE = 1024
> conn, addr = s.accept()
> data = conn.recv(BUFFER_SIZE)
> data.encode("hex")
> conn.close()
> print data
>
> and it works.
>
> but in GO,
>
> buf := make([]byte, 1024)
> reqLen, err := conn.Read(buf)
>
Note, from here you are not using reqLen, you probably should do:
buf = buf[:reqLen], although if the conn is not fast enough you may not
receive the full request.
> if err != nil {
> fmt.Println("Error: ", err.Error())
> }
>
> fmt.Println("buf: ", buf)
> fmt.Println("buf str: ", string(buf))
>
this []byte to string conversion assumes that "buf" is encoded as UTF8, so
if you have bytes that are larger than 0x7f you might get bizarre results.
*(Although
I know you mentioned ASCII, it might also be Extended ASCII)*
> var str string = ""
> for i:=0; i< len(buf); i++{
> str += strconv.FormatUint(uint64(buf[i]), 16)
> }
> fmt.Println("str: ", str)
>
> or if I use io, error2 :=ioutil.ReadAll(connection) i do not get the exact
> data that it sends me in any way
>
data, err := ioutil.ReadAll(conn)
if err != nil { panic(err) }
enc := hex.EncodeToString(data)
fmt.Println("hex:", enc)
Also you should be probably reading up to the message sequence not
everything. Protocols usually define some ending character or sequence, or
have a leading length of message. I suspect you should read up-to a
line-feed instead of everything. And also that might be the reason that you
get different results from Go and Python.
+ Egon
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