Parameters

data

string

REQUIRED

The hexadecimal data string returned from a TRC20 contract call

Returns

value

string

The parsed numeric value as a big integer

error

object

Error object that will be nil if operation was successful

Request

1
package main
2

3
import (
4
	"context"
5
	"crypto/tls"
6
	"fmt"
7
	"encoding/hex"
8

9
	"github.com/fbsobreira/gotron-sdk/pkg/client"
10
	"google.golang.org/grpc"
11
	"google.golang.org/grpc/credentials"
12
)
13

14

15
// Quicknode endpoints consist of two crucial components: the endpoint name and the corresponding token
16
// For eg: QN Endpoint: https://docs-demo.tron-mainnet.quiknode.pro/abcde123456789
17
// endpoint will be: docs-demo.tron-mainnet.quiknode.pro:50051  {50051 is the port number for Tron gRPC}
18
// token will be : abcde123456789
19

20
var token = "YOUR_TOKEN"
21
var endpoint = "YOUR_ENDPOINT:50051"
22

23

24
type auth struct {
25
	token string
26
}
27

28
func (a *auth) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
29
	return map[string]string{
30
		"x-token": a.token,
31
	}, nil
32
}
33

34
func (a *auth) RequireTransportSecurity() bool {
35
	return false
36
}
37

38
func main() {
39
	opts := []grpc.DialOption{
40
		grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})),
41
		grpc.WithPerRPCCredentials(&auth{token}),
42
	}
43
	conn := client.NewGrpcClient(endpoint)
44
	if err := conn.Start(opts...); err != nil {
45
		panic(err)
46
	}
47
	defer conn.Conn.Close()
48

49
	ownerAddress := "THPvaUhoh2Qn2y9THCZML3H815hhFhn5YC"
50
	contractAddress := "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t"
51
	method := "totalSupply()"
52
	jsonParams := ""
53

54
	response, err := conn.TriggerConstantContract(
55
		ownerAddress,
56
		contractAddress,
57
		method,
58
		jsonParams,
59
	)
60
	if err != nil {
61
		fmt.Printf("Error calling TriggerConstantContract: %v\n", err)
62
		return
63
	}
64

65
	if len(response.ConstantResult) == 0 {
66
		fmt.Println("No result returned from contract call")
67
		return
68
	}
69

70
	hexData := hex.EncodeToString(response.ConstantResult[0])
71

72
	numericValue, err := conn.ParseTRC20NumericProperty(hexData)
73
	if err != nil {
74
		fmt.Printf("Error parsing numeric property: %v\n", err)
75
		return
76
	}
77

78
	fmt.Printf("Parsed numeric value: %s\n", numericValue.String())
79

80
}

1
package main
2

3
import (
4
	"context"
5
	"crypto/tls"
6
	"fmt"
7
	"encoding/hex"
8

9
	"github.com/fbsobreira/gotron-sdk/pkg/client"
10
	"google.golang.org/grpc"
11
	"google.golang.org/grpc/credentials"
12
)
13

14

15
// Quicknode endpoints consist of two crucial components: the endpoint name and the corresponding token
16
// For eg: QN Endpoint: https://docs-demo.tron-mainnet.quiknode.pro/abcde123456789
17
// endpoint will be: docs-demo.tron-mainnet.quiknode.pro:50051  {50051 is the port number for Tron gRPC}
18
// token will be : abcde123456789
19

20
var token = "YOUR_TOKEN"
21
var endpoint = "YOUR_ENDPOINT:50051"
22

23

24
type auth struct {
25
	token string
26
}
27

28
func (a *auth) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
29
	return map[string]string{
30
		"x-token": a.token,
31
	}, nil
32
}
33

34
func (a *auth) RequireTransportSecurity() bool {
35
	return false
36
}
37

38
func main() {
39
	opts := []grpc.DialOption{
40
		grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})),
41
		grpc.WithPerRPCCredentials(&auth{token}),
42
	}
43
	conn := client.NewGrpcClient(endpoint)
44
	if err := conn.Start(opts...); err != nil {
45
		panic(err)
46
	}
47
	defer conn.Conn.Close()
48

49
	ownerAddress := "THPvaUhoh2Qn2y9THCZML3H815hhFhn5YC"
50
	contractAddress := "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t"
51
	method := "totalSupply()"
52
	jsonParams := ""
53

54
	response, err := conn.TriggerConstantContract(
55
		ownerAddress,
56
		contractAddress,
57
		method,
58
		jsonParams,
59
	)
60
	if err != nil {
61
		fmt.Printf("Error calling TriggerConstantContract: %v\n", err)
62
		return
63
	}
64

65
	if len(response.ConstantResult) == 0 {
66
		fmt.Println("No result returned from contract call")
67
		return
68
	}
69

70
	hexData := hex.EncodeToString(response.ConstantResult[0])
71

72
	numericValue, err := conn.ParseTRC20NumericProperty(hexData)
73
	if err != nil {
74
		fmt.Printf("Error parsing numeric property: %v\n", err)
75
		return
76
	}
77

78
	fmt.Printf("Parsed numeric value: %s\n", numericValue.String())
79

80
}

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