Cannot use messageBody (type []byte) as type byte in append ?

[Perry Couprie]

I created the following test code. To isolate the compile error.

Why do i get the error message :

cannot use messageBody (type []byte) as type byte in append.

Greeting from Amsterdam,

Perry 

package main

import (

"encoding/hex"

"fmt"

)

func encodeMessage(messageBody []byte) ([]byte) {

tmp,_ := hex.DecodeString(fmt.Sprintf("AB000300000000007F0100"))

DataResponse := append(tmp, messageBody)

DataResponse[0] = 0xAB

return DataResponse

}

func main() {

}

[Kurtis Rader]

On Sat, Mar 27, 2021 at 6:55 PM Perry Couprie <perr...@gmail.com> wrote:

I created the following test code. To isolate the compile error.

Why do i get the error message :

cannot use messageBody (type []byte) as type byte in append.

Because the append function takes a variadic list of of elements to append, not a slice. See https://golang.org/ref/spec#Appending_and_copying_slices.

 

func encodeMessage(messageBody []byte) ([]byte) {

tmp,_ := hex.DecodeString(fmt.Sprintf("AB000300000000007F0100"))

DataResponse := append(tmp, messageBody)

Try

     DataResponse := append(tmp, messageBody...)

Although that is probably not the most efficient solution. See, for example, bytes.Buffer.

--

Kurtis Rader

Caretaker of the exceptional canines Junior and Hank