function to print from from a Json each item using a for loop golang

Question

package main

import (
    "encoding/json"
    "io/ioutil"
    "log"
    "net/http"
)

type Response struct {
    Status  string `json:"status"`
    Message string `json:"message"`
    Result  []struct {
        BlockNumber       string `json:"blockNumber"`
        TimeStamp         string `json:"timeStamp"`
        Hash              string `json:"hash"`
        Nonce             string `json:"nonce"`
        BlockHash         string `json:"blockHash"`
        TransactionIndex  string `json:"transactionIndex"`
        From              string `json:"from"`
        To                string `json:"to"`
        Value             string `json:"value"`
        Gas               string `json:"gas"`
        GasPrice          string `json:"gasPrice"`
        IsError           string `json:"isError"`
        TxreceiptStatus   string `json:"txreceipt_status"`
        Input             string `json:"input"`
        ContractAddress   string `json:"contractAddress"`
        CumulativeGasUsed string `json:"cumulativeGasUsed"`
        GasUsed           string `json:"gasUsed"`
        Confirmations     string `json:"confirmations"`
    } `json:"result"`
}

func getapi(wallet string) ([]byte, error) {
    res, err := http.Get("https://api.bscscan.com/api?module=account&action=txlist&address=" + wallet + "&startblock=0&endblock=99999999&sort=asc&apikey=5Q4SS1XHV95SIPSCKK1FKCPGJSMRM2EI1K")
    if err != nil {
        log.Fatal(err)
    }
    defer res.Body.Close()
    return ioutil.ReadAll(res.Body)
}

func j_unm(body []byte) Response {
    var r Response
    err := json.Unmarshal(body, &r)
    if err != nil {
        log.Println("Error unmarshalling json data:", err)
    }
    return r
}

func printitem(r Response, jitem string) []string {
    item := []string{}
    for _, p := range r.Result {
        item = append(item, jitem+":"+p.jitem)
    }
    return item
}


package main


import "fmt"

func main() {
    gettrx, _ := getapi("0xf287E9f40f96C0cbAEAdD29Cf22E6CF5cC66030b")
    fmt.Println(printitem(j_unm(gettrx), "BlockNumber"))
}

I want to pass as jitem as variable. I got the following error.

jitem is define as string, could be BlockNumber or TimeStamp

p.jitem undefined (type struct{BlockNumber string "json:\"blockNumber\""; TimeStamp string "json:\"timeStamp\""; Hash string "json:\"hash\""; Nonce string "json:\"nonce\""; BlockHash string "json:\"blockHash\""; TransactionIndex string "json:\"transactionIndex\""; From string "json:\"from\""; To string "json:\"to\""; Value string "json:\"value\""; Gas string "json:\"gas\""; GasPrice string "json:\"gasPrice\""; IsError string "json:\"isError\""; TxreceiptStatus string "json:\"txreceipt_status\""; Input string "json:\"input\""; ContractAddress string "json:\"contractAddress\""; CumulativeGasUsed string "json:\"cumulativeGasUsed\""; GasUsed string "json:\"gasUsed\""; Confirmations string "json:\"confirmations\""} has no field or method jitem)compilerMissingFieldOrMethod

it is saying p which is an iterator in r.Result does not have jitem as a field. What is shown in above error message is the structure of p. — whitespace
– whitespace, Commented Jul 25, 2022 at 4:28
You should provide complete type definition and what your string parameter format is so that we can understand your code. — davidriod
– davidriod, Commented Jul 25, 2022 at 10:16
i add the completed code, if you change p.jitem for p.BlockNumber it will work — Alexis Gavidia
– Alexis Gavidia, Commented Jul 25, 2022 at 19:58

ralonr · Accepted Answer · 2022-07-25 03:46:19Z

1

is p.jitem is string? if is this type is convertible to string,then use string(p.jitem)

func printitem(r Response, jItem string) []string {
//item := []string{}
items:= make([]string,0)
for _, p := range r.Result {
    items = append(items, jItem+":"+ string(p.jItem))
}
return items

answered Jul 25, 2022 at 3:46

ralonr

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Comments

dddddddd · Accepted Answer · 2022-07-26 06:30:06Z

0

do you want this?

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "log"
    "net/http"
)

type Response struct {
    Status  string              `json:"status"`
    Message string              `json:"message"`
    Result  []map[string]string `json:"result"`
}

func getapi(wallet string) ([]byte, error) {
    res, err := http.Get("https://api.bscscan.com/api?module=account&action=txlist&address=" + wallet + "&startblock=0&endblock=99999999&sort=asc&apikey=5Q4SS1XHV95SIPSCKK1FKCPGJSMRM2EI1K")
    if err != nil {
        log.Fatal(err)
    }
    defer res.Body.Close()
    return ioutil.ReadAll(res.Body)
}

func j_unm(body []byte) Response {
    var r Response
    err := json.Unmarshal(body, &r)
    if err != nil {
        log.Println("Error unmarshalling json data:", err)
    }
    return r
}

func printitem(r Response, jitem string) []string {
    item := []string{}
    for _, p := range r.Result {
        item = append(item, jitem+":"+p[jitem])
    }
    return item
}

func main() {
    gettrx, _ := getapi("0xf287E9f40f96C0cbAEAdD29Cf22E6CF5cC66030b")
    fmt.Println(printitem(j_unm(gettrx), "blockNumber"))
}

edited Jul 26, 2022 at 6:30

answered Jul 25, 2022 at 2:43

dddddddd

162 bronze badges

5 Comments

Alexis Gavidia Over a year ago

For sure p.jitem is not a string, I want to add a variable like p.(variable)

dddddddd Over a year ago

all right, did you solve your problem?

Alexis Gavidia Over a year ago

no, that is the porblem is not a string

Alexis Gavidia Over a year ago

Thanks so much, is better in this case use map, I dint see it in that way.

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

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