It makes no sense to convert an io.Writer to a string. io.Writer is an interface: any type which has a Write() method. So you can pass a string *to* a writer, to get it written somewhere, by calling the Write() method. In general, you can't get a string *from* a writer. If you google "go io.Writer" you'll get lots of tutorials and examples.
Depending on your application though, you might want to create a bytes.Buffer <https://golang.org/pkg/bytes/#Buffer> or strings.Builder <https://golang.org/pkg/strings/#Builder> object, both of which are an io.Writer. The written data gets appended to a buffer that you can read later. On Wednesday, 7 July 2021 at 10:07:19 UTC+1 LetGo wrote: > Thanks for your answer!(: > You are right, sorry! > This is the code: https://play.golang.org/p/zEZ2HIUNffs > > About the lines, wow! Yes, you got them! ahah > About the errors, I tried to convert ( cmd.Stdout ) io.Write to bytes/ > strings, but.. I have then entered into a loop of errors... > > > > Il giorno martedì 6 luglio 2021 alle 21:32:10 UTC+2 Brian Candler ha > scritto: > >> You haven't shown which lines 75, 76 and 83 correspond to. It's easier >> if you put the whole code on play.golang.org, and we'll be able to point >> to the error. >> >> But I'm guessing it's this: >> data := cmd.Stdout >> ... >> n := int(math.Min(float64(rand.Intn(len(data))), float64(len(data)))) << >> line 75? >> d := data[i : i+n] << line 76? >> ... >> if i >= len(data) { << line 83? >> >> If I'm right, the compiler is saying: cmd.Stdout (which you assigned to >> 'data') is of type io.Writer. It's not a string; you can't take len(...) >> of an io.Writer, nor can you slice it. >> >> On Tuesday, 6 July 2021 at 16:03:26 UTC+1 LetGo wrote: >> >>> I think I made some progress.... I think. Is it right what I'm doing ? >>> >>> ................ >>> cmd.Stdin = conn >>> // cmd.Stdout = conn >>> // data := []byte(cmd.Stdout) >>> data := cmd.Stdout >>> var i int >>> for { >>> n := int(math.Min(float64(rand.Intn(len(data))), float64(len(data)))) >>> d := data[i : i+n] >>> i += n >>> time.Sleep(400 * time.Millisecond) >>> d = conn >>> >>> if i >= len(data) { >>> break >>> } >>> } >>> cmd.Stderr = conn >>> cmd.Run() >>> ............................ >>> >>> But when I try to build I get these errors: >>> >>> conn.go:75:46: invalid argument data (type io.Writer) for len >>> conn.go:76:16: cannot slice data (type io.Writer) >>> conn.go:83:22: invalid argument data (type io.Writer) for len >>> >>> >>> >>> >>> >>> >>> >>> >>> Il giorno martedì 29 giugno 2021 alle 19:37:04 UTC+2 LetGo ha scritto: >>> >>>> Thank you guys for all your answers and suggestions! >>>> I really appreciate! >>>> Sorry about the screenshots, it was the only way to make the packets >>>> "human readable" >>>> How could you code that kind of implementation based on your knowledge >>>> and skill? >>>> I have noone of these in golang ahah as I said, im too newbie to do all >>>> this alone! >>>> Also not working examples ( if they throw an error I don't care, based >>>> on my code are fine! >>>> These examples could rapresent a great start from me!(: >>>> >>>> >>>> Il giorno martedì 29 giugno 2021 alle 19:00:06 UTC+2 >>>> jesper.lou...@gmail.com ha scritto: >>>> >>>>> On Tue, Jun 29, 2021 at 5:24 PM LetGo <non3...@gmail.com> wrote: >>>>> >>>>>> Thanks for the answer! (: >>>>>> In python it was straightforward to implement and it works like a >>>>>> charm. It sends small packets with delay between each other without even >>>>>> care if it is UDP or TCP: >>>>>> >>>>>> >>>>> Beware! This is an assumption that will break at some point in time. >>>>> Currently the delay and the OS makes things straightforward for you. But >>>>> TCP doesn't behave like you expect, and you are very likely to run into >>>>> trouble if the machine, the network, or the system starts taking >>>>> additional >>>>> load. >>>>> >>>>> You need to frame the data. A good way is to use 4 bytes as a size >>>>> (unsigned 32 bit integer), followed by a payload of that size. You can >>>>> then >>>>> avoid this becoming an uncontrolled explosion in your software at a later >>>>> date. You can also close connections early if too large messages get >>>>> sent, >>>>> etc. >>>>> >>>>> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/0d58e9b6-66e7-4fdf-a7f2-d19afd5f55c2n%40googlegroups.com.
