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

huangapple
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英文:

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

问题

这是一个Go语言的代码片段，它包含了一些结构体和函数。根据你的描述，你想要将jitem作为变量传递，并且在printitem函数中使用它。然而，根据代码中的定义，jitem并不是一个结构体的字段或方法，所以会导致错误。

要解决这个问题，你可以修改printitem函数，将jitem作为参数传递，并使用反射来获取结构体中对应字段的值。下面是修改后的代码：

  1. import "reflect"
  3. func printitem(r Response, jitem string) []string {
  4. 	item := []string{}
  5. 	for _, p := range r.Result {
  6. 		value := reflect.ValueOf(p)
  7. 		field := reflect.Indirect(value).FieldByName(jitem)
  8. 		if field.IsValid() {
  9. 			item = append(item, jitem+":"+field.String())
  10. 		}
  11. 	}
  12. 	return item
  13. }

这样修改后，printitem函数会使用反射来获取结构体中对应字段的值，并将其添加到item切片中返回。

希望这可以帮助到你！如果你还有其他问题，请随时提问。

英文: 
  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"io/ioutil"
  6. 	"log"
  7. 	"net/http"
  8. )
  10. type Response struct {
  11. 	Status  string `json:"status"`
  12. 	Message string `json:"message"`
  13. 	Result  []struct {
  14. 		BlockNumber       string `json:"blockNumber"`
  15. 		TimeStamp         string `json:"timeStamp"`
  16. 		Hash              string `json:"hash"`
  17. 		Nonce             string `json:"nonce"`
  18. 		BlockHash         string `json:"blockHash"`
  19. 		TransactionIndex  string `json:"transactionIndex"`
  20. 		From              string `json:"from"`
  21. 		To                string `json:"to"`
  22. 		Value             string `json:"value"`
  23. 		Gas               string `json:"gas"`
  24. 		GasPrice          string `json:"gasPrice"`
  25. 		IsError           string `json:"isError"`
  26. 		TxreceiptStatus   string `json:"txreceipt_status"`
  27. 		Input             string `json:"input"`
  28. 		ContractAddress   string `json:"contractAddress"`
  29. 		CumulativeGasUsed string `json:"cumulativeGasUsed"`
  30. 		GasUsed           string `json:"gasUsed"`
  31. 		Confirmations     string `json:"confirmations"`
  32. 	} `json:"result"`
  33. }
  35. func getapi(wallet string) ([]byte, error) {
  36. 	res, err := http.Get("https://api.bscscan.com/api?module=account&action=txlist&address=" + wallet + "&startblock=0&endblock=99999999&sort=asc&apikey=5Q4SS1XHV95SIPSCKK1FKCPGJSMRM2EI1K")
  37. 	if err != nil {
  38. 		log.Fatal(err)
  39. 	}
  40. 	defer res.Body.Close()
  41. 	return ioutil.ReadAll(res.Body)
  42. }
  44. func j_unm(body []byte) Response {
  45. 	var r Response
  46. 	err := json.Unmarshal(body, &r)
  47. 	if err != nil {
  48. 		log.Println("Error unmarshalling json data:", err)
  49. 	}
  50. 	return r
  51. }
  53. func printitem(r Response, jitem string) []string {
  54. 	item := []string{}
  55. 	for _, p := range r.Result {
  56. 		item = append(item, jitem+":"+p.jitem)
  57. 	}
  58. 	return item
  59. }
  2. package main
  5. import "fmt"
  7. func main() {
  8. 	gettrx, _ := getapi("0xf287E9f40f96C0cbAEAdD29Cf22E6CF5cC66030b")
  9. 	fmt.Println(printitem(j_unm(gettrx), "BlockNumber"))
  10. }

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

答案1

得分: 1

p.jitem 是字符串吗？如果是字符串类型，可以将其转换为字符串，然后使用 string(p.jitem)。

  1. func printitem(r Response, jItem string) []string {
  2.     items := make([]string, 0)
  3.     for _, p := range r.Result {
  4.         items = append(items, jItem+":"+ string(p.jItem))
  5.     }
  6.     return items
  7. }
英文:

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

  1. func printitem(r Response, jItem string) []string {
  2. //item := []string{}
  3. items:= make([]string,0)
  4. for _, p := range r.Result {
  5.     items = append(items, jItem+":"+ string(p.jItem))
  6. }
  7. return items

答案2

得分: 0

你想要这个吗？

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"log"
  8. 	"net/http"
  9. )
  11. type Response struct {
  12. 	Status  string              `json:"status"`
  13. 	Message string              `json:"message"`
  14. 	Result  []map[string]string `json:"result"`
  15. }
  17. func getapi(wallet string) ([]byte, error) {
  18. 	res, err := http.Get("https://api.bscscan.com/api?module=account&action=txlist&address=" + wallet + "&startblock=0&endblock=99999999&sort=asc&apikey=5Q4SS1XHV95SIPSCKK1FKCPGJSMRM2EI1K")
  19. 	if err != nil {
  20. 		log.Fatal(err)
  21. 	}
  22. 	defer res.Body.Close()
  23. 	return ioutil.ReadAll(res.Body)
  24. }
  26. func j_unm(body []byte) Response {
  27. 	var r Response
  28. 	err := json.Unmarshal(body, &r)
  29. 	if err != nil {
  30. 		log.Println("Error unmarshalling json data:", err)
  31. 	}
  32. 	return r
  33. }
  35. func printitem(r Response, jitem string) []string {
  36. 	item := []string{}
  37. 	for _, p := range r.Result {
  38. 		item = append(item, jitem+":"+p[jitem])
  39. 	}
  40. 	return item
  41. }
  43. func main() {
  44. 	gettrx, _ := getapi("0xf287E9f40f96C0cbAEAdD29Cf22E6CF5cC66030b")
  45. 	fmt.Println(printitem(j_unm(gettrx), "blockNumber"))
  46. }
英文:

do you want this?

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"log"
  8. 	"net/http"
  9. )
  11. type Response struct {
  12. 	Status  string              `json:"status"`
  13. 	Message string              `json:"message"`
  14. 	Result  []map[string]string `json:"result"`
  15. }
  17. func getapi(wallet string) ([]byte, error) {
  18. 	res, err := http.Get("https://api.bscscan.com/api?module=account&action=txlist&address=" + wallet + "&startblock=0&endblock=99999999&sort=asc&apikey=5Q4SS1XHV95SIPSCKK1FKCPGJSMRM2EI1K")
  19. 	if err != nil {
  20. 		log.Fatal(err)
  21. 	}
  22. 	defer res.Body.Close()
  23. 	return ioutil.ReadAll(res.Body)
  24. }
  26. func j_unm(body []byte) Response {
  27. 	var r Response
  28. 	err := json.Unmarshal(body, &r)
  29. 	if err != nil {
  30. 		log.Println("Error unmarshalling json data:", err)
  31. 	}
  32. 	return r
  33. }
  35. func printitem(r Response, jitem string) []string {
  36. 	item := []string{}
  37. 	for _, p := range r.Result {
  38. 		item = append(item, jitem+":"+p[jitem])
  39. 	}
  40. 	return item
  41. }
  43. func main() {
  44. 	gettrx, _ := getapi("0xf287E9f40f96C0cbAEAdD29Cf22E6CF5cC66030b")
  45. 	fmt.Println(printitem(j_unm(gettrx), "blockNumber"))
  46. }

huangapple
  • 本文由 发表于 2022年7月25日 10:26:57
  • 转载请务必保留本文链接：https://go.coder-hub.com/73103496.html
  • go
  • json
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