Why is *a{...} invalid indirect?
invalid indirect of oauth.RequestToken literal (type oauth.RequestToken)
Why is the following line invalid?
func (s *Service) Callback(r *http.Request, req *RequestOauth, resp *Response) error {
c := endpoints.NewContext(r)
consumer.HttpClient=urlfetch.Client(c)
====>requestToken := *oauth.RequestToken{Token:req.Oauth_token, Secret:""}<======
b, err := TwitterApi(requestToken, req.Oauth_verifier)
resp.Message=b.Name
return err
}
func TwitterApi(requestToken *oauth.RequestToken, verificationCode string) (u *UserT, err error) {
accessToken, err := consumer.AuthorizeToken(requestToken, verificationCode)
if err != nil {log.Fatal(err)}
response, err := consumer.Get("https://api.twitter.com/1.1/account/verify_credentials.json", nil, accessToken)
if err != nil {log.Fatal(err)}
defer response.Body.Close()
b, err := ioutil.ReadAll(response.Body)
err = json.Unmarshal(b, &u)
return
}
Solution 1:
This line:
requestToken := *oauth.RequestToken{Token:req.Oauth_token, Secret:""}
translated literally says "create an instance of oauth.RequestToken
, then attempt to dereference it as a pointer." i.e. it is attempting to perform an indirect (pointer) access via a literal struct value.
Instead, you want to create the instance and take its address (&
), yielding a pointer-to-RequestToken, *oauth.RequestToken
:
requestToken := &oauth.RequestToken{Token:req.Oauth_token, Secret:""}
Alternatively, you could create the token as a local value, then pass it by address to the TwitterApi
function:
requestToken := oauth.RequestToken{Token:req.Oauth_token, Secret:""}
b, err := TwitterApi(&requestToken, req.Oauth_verifier)
Solution 2:
You'll need to create a pointer to the value you're creating, which is done with &
, *
does the opposite, it dereferences a pointer. So:
requestToken := &oauth.RequestToken{Token:req.Oauth_token, Secret:""}
Now requestToken is a pointer to a oauth.RequestToken value.
Or you can initialize requestToken as a value:
requestToken := oauth.RequestToken{Token:req.Oauth_token, Secret:""}
Now requestToken is a oauth.RequestToken value.
Then you can pass a pointer to that value to TwitterApi
b, err := TwitterApi(&requestToken, req.Oauth_verifier)
Solution 3:
I may add to the top answer, if we want to explicitly look at a struct value in one line we could do this :
*&yourStruct
Where you get the instance of your struct, look up at its memory address, and access its value.