bishi, mianshi 基于区块链的毕业设计Decode and encode ETH contract call package – 对ETH合同呼叫包进行解码和编码
本文提供基于区块链的毕业设计国外最新区块链项目源码下载，包括solidity,eth,fabric等blockchain区块链,基于区块链的毕业设计Decode and encode ETH contract call package – 对ETH合同呼叫包进行解码和编码 是一篇很好的国外资料
Decode and encode ETH contract call package
This package only deals with contract call encoding/decoding.
What this package does NOT do
- fetch contract abi from chain
- fetch any transaction infomation from chain
- encoding the whole ETH transaction with RLP format
- digest or sign transaction
- send transaction to chain
Decode contract call
import 'package:eth_abi_codec/eth_abi_codec.dart'; import 'package:convert/convert.dart'; // Step1. // Fetch contract abi from either etherscan.io or infura. // For example, contract abi for USDT-ERC20 can be found on // [USDT ERC20 Contract Code Page] // (https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7#code), // the abi is listed at Contract ABI section. var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); // Step2. // Build contract call object by abi var data = hex.decode('hex string of input field'); var call = abi.decomposeCall(data); // Step3. // Fetch call infomations print(call.functionName); print(call.callParams['_to']); print(call.callParams['_value']);
Encode contract call
import 'package:eth_abi_codec/eth_abi_codec.dart'; import 'package:convert/convert.dart'; // Step1. // Fetch abi json var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); // Step2. // Build contract call object var call = ContractCall('transfer') ..setCallParam('_to', 'c9d983203307abccd3e1b303a00ea0a19724fe2c') ..setCallParam('_value', BigInt.from(1000000000000000000)); // Step3. // Encode call print(hex.encode(abi.composeCall(call)));
Decode contract call result
import 'dart:convert'; import 'package:convert/convert.dart'; import 'package:eth_abi_codec/eth_abi_codec.dart'; var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); var data = hex.decode('hex string of contract call result'); var res = abi.decomposeResult('method name', data); print(res['method output param name']);
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Merge pull request
Decode and encode ETH contract call package
此软件包仅处理合约呼叫编码/解码。
What this package does NOT do
- 从chain获取任何交易信息
- 用RLP格式编码整个ETH事务
- 摘要或签名事务
- 将事务发送到链
- send transaction to chain
Decode contract call
import 'package:eth_abi_codec/eth_abi_codec.dart'; import 'package:convert/convert.dart'; // Step1. // Fetch contract abi from either etherscan.io or infura. // For example, contract abi for USDT-ERC20 can be found on // [USDT ERC20 Contract Code Page] // (https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7#code), // the abi is listed at Contract ABI section. var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); // Step2. // Build contract call object by abi var data = hex.decode('hex string of input field'); var call = abi.decomposeCall(data); // Step3. // Fetch call infomations print(call.functionName); print(call.callParams['_to']); print(call.callParams['_value']);
Encode contract call
import 'package:eth_abi_codec/eth_abi_codec.dart'; import 'package:convert/convert.dart'; // Step1. // Fetch abi json var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); // Step2. // Build contract call object var call = ContractCall('transfer') ..setCallParam('_to', 'c9d983203307abccd3e1b303a00ea0a19724fe2c') ..setCallParam('_value', BigInt.from(1000000000000000000)); // Step3. // Encode call print(hex.encode(abi.composeCall(call)));
Decode contract call result
import 'dart:convert'; import 'package:convert/convert.dart'; import 'package:eth_abi_codec/eth_abi_codec.dart'; var abi = ContractABI.fromJson(jsonDecode(ABI_JSON_STR)); var data = hex.decode('hex string of contract call result'); var res = abi.decomposeResult('method name', data); print(res['method output param name']);
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Merge pull request
部分转自网络，侵权联系删除区块链源码网
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