Go-Ethereum
通過 JSON RPC 獲取智能合約代幣餘額
通過 Geth 命令行，我可以獲得我的智能合約代幣餘額：
var mytest = eth.contract([{interface}]).at(contract address); mytest.balanceOf(eth.accounts[0]) >998我想在我的網站上顯示代幣餘額。我怎樣才能做到這一點？
我嘗試了 JSON-RPC 和幾種方法，例如
eth_getTransactionByHash，但不知道如何獲得平衡。
使用web3.js在您的網站上顯示余額。
Geth 的控制台（您可以在其中獲取代幣餘額）是 Javascript 並在後台使用 web3.js，因此您的網站程式碼幾乎相同。
否則，您必須使用 JSON-RPC，
eth_call並且必須對您正在呼叫的函式及其參數進行ABI編碼。它要復雜得多，例如： How to call a contract method using the eth_call JSON-RPC API如果需要伺服器端渲染，則可以檢查該設計決策，因為使用者應該能夠在沒有伺服器的情況下執行去中心化應用程序：Swarm 和 IPFS 是 DApp 可能採用的技術，需要牢記在心。
添加到@eth♦ 的答案和@Jeroen 的評論
使用web3 1.0.0-beta.31獲取 Smartcontract 代幣餘額
在 1.0.0-beta 中……現在大部分是通過Promises處理的，因此你可以這樣做：
var mytest = new web3.eth.Contract({interface}, '0x123....', { from: '0x456...', // default from address gasPrice: '20000000000' // default gas price in wei, 20 gwei in this case }); mytest.methods.balanceOf('0x456...').call() .then(function(result){ //the result holds your Token Balance that you can assign to a var var myTokenBalance = result; return result; });
{interface}您的 Contract 的 ABI在哪裡0x123....。0x123....您的契約地址在哪裡。- 您持有代幣的乙太坊賬戶的地址在哪裡
0x456....（即您希望從中檢索其代幣餘額的 ETH 賬戶）不要忘記添加
new前面web3.eth.Contract(....)@Jeroen這樣你就不會得到錯誤
MyContract.at 不是函式
了。
注意：我正在使用IPC Provider geth.ipc 與我的節點進行互動（因為我在同一台 PC 本地主機上，因此更多保存而不是使用 HTTP 請求）。
if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); } else { var net = require('net'); var web3 = new Web3('/home/yourHomeFolder/.ethereum/geth.ipc', net); };
web3.eth.Contract({interface}編輯：作為我用於我的智能合約的 ABI JSON () 的參考，作為myContractABI我的{interface}：myContractABI = [ { "constant": false, "inputs": [ { "name": "newSellPrice", "type": "uint256" }, { "name": "newBuyPrice", "type": "uint256" } ], "name": "setPrices", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "name", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_spender", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "approve", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_from", "type": "address" }, { "name": "_to", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "decimals", "outputs": [ { "name": "", "type": "uint8" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_value", "type": "uint256" } ], "name": "burn", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "sellPrice", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "", "type": "address" } ], "name": "balanceOf", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "target", "type": "address" }, { "name": "mintedAmount", "type": "uint256" } ], "name": "mintToken", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_from", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "burnFrom", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "buyPrice", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "owner", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "symbol", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [], "name": "buy", "outputs": [], "payable": true, "stateMutability": "payable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_to", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "transfer", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "", "type": "address" } ], "name": "frozenAccount", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_spender", "type": "address" }, { "name": "_value", "type": "uint256" }, { "name": "_extraData", "type": "bytes" } ], "name": "approveAndCall", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "", "type": "address" }, { "name": "", "type": "address" } ], "name": "allowance", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "amount", "type": "uint256" } ], "name": "sell", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "target", "type": "address" }, { "name": "freeze", "type": "bool" } ], "name": "freezeAccount", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "newOwner", "type": "address" } ], "name": "transferOwnership", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "name": "initialSupply", "type": "uint256" }, { "name": "tokenName", "type": "string" }, { "name": "tokenSymbol", "type": "string" } ], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "target", "type": "address" }, { "indexed": false, "name": "frozen", "type": "bool" } ], "name": "FrozenFunds", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "from", "type": "address" }, { "indexed": true, "name": "to", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "from", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Burn", "type": "event" } ];