Ich habe ein Vertragstoken mit dem Token Solidity Code von Ethereum.org erstellt. Es hat eine Funktion namens Transfer, um Token zwischen Konten zu senden:
function transfer(address _to, uint256 _value)
Ich muss wissen, wie ich diesen Vertrag mit web3 verbinden und dann eine bestimmte Anzahl von generierten Token an ein anderes Konto senden kann. Ich habe seit geraumer Zeit damit gekämpft, wie ich das machen soll, und hoffe, dass diese Community helfen kann. Folgendes habe ich bisher mit web3 Version 0.20.0:
const Web3 = require("web3");
const web3 = new Web3();
web3.setProvider(new
web3.providers.HttpProvider("https://ropsten.infura.io/XXXXXX"));
var abi = [ {} ] // redacted on purpose
var count = web3.eth.getTransactionCount("0x9...");
var abiArray = abi;
var contractAddress = "0x2...";
var contract = web3.eth.contract(abiArray).at(contractAddress);
var data = contract.transfer.getData("0x2...", 10000, {from: "0x9..."});
var gasPrice = web3.eth.gasPrice;
var gasLimit = 90000;
var rawTransaction = {
"from": "0x9...",
"nonce": web3.toHex(count),
"gasPrice": web3.toHex(gasPrice),
"gasLimit": web3.toHex(gasLimit),
"to": "0x2...",
"value": "0x1",
"data": data,
"chainId": 0x03
};
var privKey = new Buffer('XXXXXXXXXXXXXX', 'hex');
var tx = new Tx(rawTransaction);
tx.sign(privKey);
var serializedTx = tx.serialize();
web3.eth.sendRawTransaction('0x' + serializedTx.toString('hex'), function(err, hash) {
if (!err)
console.log(hash);
else
console.log(err);
});
Diese Transaktion funktioniert, aber sie sendet Ether im Gegensatz zum eigentlichen ERC20-Token. Ich bin wirklich ratlos, warum das so ist und wäre für jede Hilfe dankbar.
Code für Token-Vertrag:
contract Token {
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
// 18 decimals is the strongly suggested default, avoid changing it
uint256 public totalSupply;
// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed from, address indexed to, uint256 value);
// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);
/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function Token(
uint256 initialSupply,
string tokenName,
string tokenSymbol
) public {
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
name = tokenName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
}
/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint _value) internal {
// Prevent transfer to 0x0 address. Use burn() instead
require(_to != 0x0);
// Check if the sender has enough
require(balanceOf[_from] >= _value);
// Check for overflows
require(balanceOf[_to] + _value > balanceOf[_to]);
// Save this for an assertion in the future
uint previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
/**
* Transfer tokens
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer(address _to, uint256 _value) public {
_transfer(msg.sender, _to, _value);
}
/**
* Transfer tokens from other address
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(_value <= allowance[_from][msg.sender]); // Check allowance
allowance[_from][msg.sender] -= _value;
_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve(address _spender, uint256 _value) public
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}
/**
* Set allowance for other address and notify
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
* @param _extraData some extra information to send to the approved contract
*/
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
public
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/**
* Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough
balanceOf[msg.sender] -= _value; // Subtract from the sender
totalSupply -= _value; // Updates totalSupply
Burn(msg.sender, _value);
return true;
}
/**
* Destroy tokens from other ccount
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public returns (bool success) {
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough
require(_value <= allowance[_from][msg.sender]); // Check allowance
balanceOf[_from] -= _value; // Subtract from the targeted balance
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
totalSupply -= _value; // Update totalSupply
Burn(_from, _value);
return true;
}
}
Das Problem ist, dass Sie einen Wert ungleich Null senden (in Ihrem Beispiel 1 gwei). Wenn Sie Token übertragen möchten, müssen Sie den Wert auf Null setzen.
var rawTransaction = {
"value": 0,
...
};
Der Grund dafür ist, dass für Sicherheitsfunktionen, die Ether erhalten, der zahlbare Modifikator vorhanden sein muss. Ihre Transferfunktion hat diesen Modifikator nicht und lehnt jede Transaktion mit einer Ether-Menge ungleich Null ab.
function transfer(address _to, uint256 _value) public {
_transfer(msg.sender, _to, _value);
}
Ismael
Viper
Ismael
Viper
Ismael
Viper
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