Golang : Convert(cast) bytes.Buffer or bytes.NewBuffer type to io.Reader
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
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+6.7k Golang : Reverse a string with unicode
+12.1k Golang : Convert(cast) int to int64
+16.2k Google Chrome : Your connection to website is encrypted with obsolete cryptography
+6.3k Golang : Word limiter example
+12.8k Golang : Simple word wrap or line breaking example
+4.3k Responsive Google Adsense
+8.4k Facebook : Getting the friends list with PHP return JSON format
+19k Golang : Secure(TLS) connection between server and client
+12.9k Golang : Google Drive API upload and rename example
+16.1k Golang : How to remove certain lines from a file