Golang : Convert(cast) bytes.Buffer or bytes.NewBuffer type to io.Reader



Tags : golang bytes-buffer io-reader convert-cast

Problem : You need to convert or type cast bytes.Buffer or bytes.NewBuffer type to io.Reader to use in io.MultiReader() function because of this error : cannot use buffer_slice (type []*bytes.Buffer) as type io.Reader in argument to io.MultiReader: []*bytes.Buffer does not implement io.Reader (missing Read method). Solution : Wrap the bytes.Buffer with io.Reader array. For example : package main import ( "bytes" "fmt" "io" "io/ioutil" ) func main() { readerBuffer := bytes.NewBuffer([]byte("abcdefghijkl")) readerBuffer2 := bytes.NewBuffer([]byte("mnopqrstuvwxyz")) buff := []io.Reader{readerBuffer, readerBuffer2 // <------ here combined := io.MultiReader(buff...) data, _ := ioutil.ReadAll(combined) fmt.Println(string(data)) or package main import ( "bytes" "fmt" "io" "io/ioutil" ) func main() { //readerBuffer := bytes.NewBuffer([]byte("abcdefghijkl")) readerBuffer := &bytes.Buffer{ readerBuffer.Write([]byte("abcdefghijkl")) //readerBuffer2 := bytes.NewBuffer([]byte("mnopqrstuvwxyz")) readerBuffer2 := &bytes.Buffer{ readerBuffer2.Write([]byte("mnopqrstuvwxyz")) buff := []io.Reader{readerBuffer, readerBuffer2 // <------ here combined := io.MultiReader(buff...) data, _ := ioutil.ReadAll(combined) fmt.Println(string(data)) Reference : https://socketloop.com/references/golang-io-multireader-function-example

  See also : Golang : Convert(cast) []byte to io.Reader type



Tags : golang bytes-buffer io-reader convert-cast

By Adam Ng

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