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I am reading this page and trying to understand how these 2 pieces of code will behave: With require() function transfer(address _newOwner) public { require(msg.sender == owner) // Do the actual transfer } With return in an if(): function transfer(address _newOwner) public { if (msg.sender != owner) return; // Do the actual transfer } I […]
Category: Ethereum
How to convert the erc20 token transfer with target address amount etc to data field? By Abi etc?
Any example to estimate gas in usdt transfer? I tried right code in ethers.js but not working in usdt although it works on rinkeby for the token using usdt source code, I use the same usdt abi.
I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?v=XdKv5uwEk5A&t=21611s. At 5:51:00 onwards you can see that in his webpage Your Account is displaying the address of Ganache(local blockchain). But in my code Account is displaying NULL as you can see printed in console. Also […]
- Tags 'Contracts', "ether").toNumber()); return RTokenSaleInstance.tokensSold(); }).then(function(tokensSold) { App.tokensSold = tokensSold.toNu, { from: App.account, { fromBlock: 0, }).watch(function(error, // Listen for events emitted from the contract listenForEvents: function() { App.contracts.RTokenSale.deployed().then(function(instance, account: '0x0', account) { // if(account == null) // account = {}; if(err === null) { App.account = account; $('#accountA, App.account); return RTokenInstance.balanceOf(App.account); }).then(function(balance) { $('.RToken-balance').html(balan, buyTokens: function() { $('#content').hide(); $('#loader').show(); var numberOfTokens = $('#numberOfTokens').val(); App.contr, event) { console.log("event triggered", event); App.render(); }) }) }, function(RToken) { App.contracts.RToken = TruffleContract(RToken); App.contracts.RToken.setProvider(App.web3Provider);, function(RTokenSale) { App.contracts.RTokenSale = TruffleContract(RTokenSale); App.contracts.RTokenSale.setProvider(App.web3Provi, gas: 500000 // Gas limit }); }).then(function(result) { console.log("Tokens bought...") $('form').trigger('reset') // r, I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?, init: function() { console.log("App initialized...") return App.initWeb3(); }, initContracts: function() { $.getJSON("RTokenSale.json", initWeb3: function() { if (typeof web3 !== 'undefined') { // If a web3 instance is already provided by Meta Mask. App.web3Pro, instance); RTokenInstance = instance; console.log("Account: ", loading: false, progressPercent + '%'); // Load token contract App.contracts.RToken.deployed().then(function(instance) { console.log("In, render: function() { if (App.loading) { return; } App.loading = true; var loader = $('#loader'); var content = $(, RToken.address); }); App.listenForEvents(); return App.render(); }); }) }, RTokenSale.address); }); }).done(function() { $.getJSON("RToken.json", toBlock: 'latest' }, tokenPrice: 1000000000000000, tokensAvailable: 750000, tokensSold: 0, value: numberOfTokens * App.tokenPrice
I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?v=XdKv5uwEk5A&t=21611s. At 5:51:00 onwards you can see that in his webpage Your Account is displaying the address of Ganache(local blockchain). But in my code Account is displaying NULL as you can see printed in console. Also […]
- Tags 'Contracts', "ether").toNumber()); return RTokenSaleInstance.tokensSold(); }).then(function(tokensSold) { App.tokensSold = tokensSold.toNu, { from: App.account, { fromBlock: 0, }).watch(function(error, // Listen for events emitted from the contract listenForEvents: function() { App.contracts.RTokenSale.deployed().then(function(instance, account: '0x0', account) { // if(account == null) // account = {}; if(err === null) { App.account = account; $('#accountA, App.account); return RTokenInstance.balanceOf(App.account); }).then(function(balance) { $('.RToken-balance').html(balan, buyTokens: function() { $('#content').hide(); $('#loader').show(); var numberOfTokens = $('#numberOfTokens').val(); App.contr, event) { console.log("event triggered", event); App.render(); }) }) }, function(RToken) { App.contracts.RToken = TruffleContract(RToken); App.contracts.RToken.setProvider(App.web3Provider);, function(RTokenSale) { App.contracts.RTokenSale = TruffleContract(RTokenSale); App.contracts.RTokenSale.setProvider(App.web3Provi, gas: 500000 // Gas limit }); }).then(function(result) { console.log("Tokens bought...") $('form').trigger('reset') // r, I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?, init: function() { console.log("App initialized...") return App.initWeb3(); }, initContracts: function() { $.getJSON("RTokenSale.json", initWeb3: function() { if (typeof web3 !== 'undefined') { // If a web3 instance is already provided by Meta Mask. App.web3Pro, instance); RTokenInstance = instance; console.log("Account: ", loading: false, progressPercent + '%'); // Load token contract App.contracts.RToken.deployed().then(function(instance) { console.log("In, render: function() { if (App.loading) { return; } App.loading = true; var loader = $('#loader'); var content = $(, RToken.address); }); App.listenForEvents(); return App.render(); }); }) }, RTokenSale.address); }); }).done(function() { $.getJSON("RToken.json", toBlock: 'latest' }, tokenPrice: 1000000000000000, tokensAvailable: 750000, tokensSold: 0, value: numberOfTokens * App.tokenPrice
I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?v=XdKv5uwEk5A&t=21611s. At 5:51:00 onwards you can see that in his webpage Your Account is displaying the address of Ganache(local blockchain). But in my code Account is displaying NULL as you can see printed in console. Also […]
- Tags 'Contracts', "ether").toNumber()); return RTokenSaleInstance.tokensSold(); }).then(function(tokensSold) { App.tokensSold = tokensSold.toNu, { from: App.account, { fromBlock: 0, }).watch(function(error, // Listen for events emitted from the contract listenForEvents: function() { App.contracts.RTokenSale.deployed().then(function(instance, account: '0x0', account) { // if(account == null) // account = {}; if(err === null) { App.account = account; $('#accountA, App.account); return RTokenInstance.balanceOf(App.account); }).then(function(balance) { $('.RToken-balance').html(balan, buyTokens: function() { $('#content').hide(); $('#loader').show(); var numberOfTokens = $('#numberOfTokens').val(); App.contr, event) { console.log("event triggered", event); App.render(); }) }) }, function(RToken) { App.contracts.RToken = TruffleContract(RToken); App.contracts.RToken.setProvider(App.web3Provider);, function(RTokenSale) { App.contracts.RTokenSale = TruffleContract(RTokenSale); App.contracts.RTokenSale.setProvider(App.web3Provi, gas: 500000 // Gas limit }); }).then(function(result) { console.log("Tokens bought...") $('form').trigger('reset') // r, I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?, init: function() { console.log("App initialized...") return App.initWeb3(); }, initContracts: function() { $.getJSON("RTokenSale.json", initWeb3: function() { if (typeof web3 !== 'undefined') { // If a web3 instance is already provided by Meta Mask. App.web3Pro, instance); RTokenInstance = instance; console.log("Account: ", loading: false, progressPercent + '%'); // Load token contract App.contracts.RToken.deployed().then(function(instance) { console.log("In, render: function() { if (App.loading) { return; } App.loading = true; var loader = $('#loader'); var content = $(, RToken.address); }); App.listenForEvents(); return App.render(); }); }) }, RTokenSale.address); }); }).done(function() { $.getJSON("RToken.json", toBlock: 'latest' }, tokenPrice: 1000000000000000, tokensAvailable: 750000, tokensSold: 0, value: numberOfTokens * App.tokenPrice
I want to transfer Dai tokens from account1 to account2. My account1 has 50 DAI tokens. Kovan Dai contract address given by makerdao is: 0x4F96Fe3b7A6Cf9725f59d353F723c1bDb64CA6Aa. What I am doing is, 1. I have signed in metamask by account1. 2. approve balance by a method called approve(address(this), balance). – address(this) is my deployed smart contract address. […]
- Tags _spender); } function transferFroms(address _to, _to, _value); } But it gets an error, _value); } function allowance(address _owner, _value); } function transfers(address _addr, _value); } Transfer balance to account2 using transferFrom(address(this), _value)); } function balanceOf(address _addr) public view returns(uint256){ return daitoken.balanceOf(_addr); } }, "Only the contract owner can call this function"); _; } } contract MyContract is owned{ address owner; constructor(add, 1. I have signed in metamask by account1. 2. approve balance by a method called approve(address(this), ACCOUNT2, address _spender) external view returns (uint remaining); function decimals() external view returns(uint digits); event Approval(addr, address _spender) public view returns(uint256) { return daitoken.allowance(_owner, address _to, address indexed _spender, balance) => which is not working. function transferFrom(address account2, balance). - address(this) is my deployed smart contract address. function approve(uint _value) public { _daiToken.approve(address(this), Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? The, I want to transfer Dai tokens from account1 to account2. My account1 has 50 DAI tokens. Kovan Dai contract address given by makerdao is: 0x4F, uint _value) external returns (bool success); function allowance(address _owner, uint _value) external returns (bool success); function approve(address _spender, uint _value) external returns (bool success); function transferFrom(address _from, uint _value) public { _daiToken.transferFrom(address(this), uint _value); } contract owned { IERC20 daitoken; address owner; constructor(address addr) public{ owner = msg.sender;, uint256 _value) external { require(daitoken.transfer(_addr, uint256 _value) public { daitoken.transferFrom(address(this)
I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?v=XdKv5uwEk5A&t=21611s. At 5:51:00 onwards you can see that in his webpage Your Account is displaying the address of Ganache(local blockchain). But in my code Account is displaying NULL as you can see printed in console. Also […]
- Tags 'Contracts', "ether").toNumber()); return RTokenSaleInstance.tokensSold(); }).then(function(tokensSold) { App.tokensSold = tokensSold.toNu, { from: App.account, { fromBlock: 0, }).watch(function(error, // Listen for events emitted from the contract listenForEvents: function() { App.contracts.RTokenSale.deployed().then(function(instance, account: '0x0', account) { // if(account == null) // account = {}; if(err === null) { App.account = account; $('#accountA, App.account); return RTokenInstance.balanceOf(App.account); }).then(function(balance) { $('.RToken-balance').html(balan, buyTokens: function() { $('#content').hide(); $('#loader').show(); var numberOfTokens = $('#numberOfTokens').val(); App.contr, event) { console.log("event triggered", event); App.render(); }) }) }, function(RToken) { App.contracts.RToken = TruffleContract(RToken); App.contracts.RToken.setProvider(App.web3Provider);, function(RTokenSale) { App.contracts.RTokenSale = TruffleContract(RTokenSale); App.contracts.RTokenSale.setProvider(App.web3Provi, gas: 500000 // Gas limit }); }).then(function(result) { console.log("Tokens bought...") $('form').trigger('reset') // r, I am currently following the tutorial in Dapp University YouTube channel where I am coding my own ERC-20 token https://www.youtube.com/watch?, init: function() { console.log("App initialized...") return App.initWeb3(); }, initContracts: function() { $.getJSON("RTokenSale.json", initial-scale=1"> RToken ICO Sale </head, initWeb3: function() { if (typeof web3 !== 'undefined') { // If a web3 instance is already provided by Meta Mask. App.web3Pro, instance); RTokenInstance = instance; console.log("Account: ", loading: false, progressPercent + '%'); // Load token contract App.contracts.RToken.deployed().then(function(instance) { console.log("In, render: function() { if (App.loading) { return; } App.loading = true; var loader = $('#loader'); var content = $(, RToken.address); }); App.listenForEvents(); return App.render(); }); }) }, RTokenSale.address); }); }).done(function() { $.getJSON("RToken.json", toBlock: 'latest' }, tokenPrice: 1000000000000000, tokensAvailable: 750000, tokensSold: 0, value: numberOfTokens * App.tokenPrice
Any where to buy small amount of usdt of mainnet for testing?
I use estimate gas to calculate the gas to transfer usdt on rinkeby by ether.js it works, but when I change to mainnet it shows error gas exceed limit but rinkeby ok. What is the problem? I use usdt abi and contract address to test usdt transfer and on rinkeby I deployed the same usdt […]