Convert byte slice to io.Reader
In my project, I have a byte slice from a request's response.
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
log.Println("StatusCode为" + strconv.Itoa(resp.StatusCode))
return
}
respByte, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println("fail to read response data")
return
}
This works, but if I want to get the response's body for io.Reader, how do I convert? I tried the newreader/writer but wasn't successful.
io.Reader? In that case resp.Body is already of that type.
*bytes.Reader which implements the io.Reader interface.
To get a type that implements io.Reader from a []byte slice, you can use bytes.NewReader in the bytes package:
r := bytes.NewReader(byteData)
This will return a value of type bytes.Reader which implements the io.Reader (and io.ReadSeeker) interface.
Don't worry about them not being the same "type". io.Reader is an interface and can be implemented by many different types. To learn a little bit more about interfaces in Go, read Effective Go: Interfaces and Types.
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[]byteinto anio.Writer? E.g.bytes.NewWriter(destination)bytes.Buffer. There you create a buffer that implementsio.Writerlike this:w := bytes.NewBuffer(destination).govet:cannot use *bytes.NewReader(out.Bytes()) (type bytes.Reader) as type io.Reader in argument to ioutil.NopCloser:(bytes.Readerhas pointer receivers, and you are turning it from a pointer type (*bytes.Reader) to a base type (bytes.Reader) . Just get rid of the asterisk (*) and you should be fine :)