I'm studying Go and am a real newbie in this field.
I am facing a problem when I try to copy some value.
What I am doing is:
- I want to get some response in [response] using httpRequest.
httpClient := &http.Client{}
response, err := httpClient.Do(req)
if err != nil {
panic(err)
}
- After that, I want to save the stored value in response at 'origin.txt'
origin_ ,_:= ioutil.ReadAll(response.Body)
f_, err := os.Create("origin.txt")
f_.Write(origin_);
- And I want to get a specific value by using goquery package.
doc, err := goquery.NewDocumentFromReader(response.Body)
if err != nil {
log.Fatal(err)
}
doc.Find(".className").Each(func(i int, s *goquery.Selection) {
w.WriteString("============" + strconv.Itoa(i) + "============")
s.Find("tr").Each(func(i int, s_ *goquery.Selection) {
fmt.Println(s_.Text())
w.WriteString(s_.Text())
})
}
)
But in this case, I can get a value exactly what I want from 2) but cannot get anything from 3).
At first, I think the problem is, the response object at 3) is affected by 2) action. Because it is a reference object.
So I tried to copy it to another object and then do it again.
origin := *response
but, I got the same result as first.
What should I do? How can I assign a reference value to another one by its value?
Should I request it twice for each attempt?
I actually don't see where you use shared resources between 2 and 3.However that being said
origin := *response
won't buy you much. The data (response.Body
) is aio.ReadCloser
. Theioutil.ReadAll()
will consume and store all the data that the stream has. You only get to do this once.However you have the data stored in
origin
. If you need anotherio.Reader
for that data (say for case 3), then you can make that byte slice look like anio.Reader
again:bytes.NewReader(origin)
.