Warum erhalte ich mit testRPC und einer grafischen Benutzeroberfläche keinen Rückgabewert der Funktion meines Smart Contracts?

Question

Warum erhalte ich mit testRPC und einer grafischen Benutzeroberfläche keinen Rückgabewert der Funktion meines Smart Contracts?

gui
remixen
Finanzen
testrpc
Javascript
Vertragsaufruf

Fragesteller

Ich habe einen Smart Contract, der mit Remix getestet wurde und gut funktioniert. Sein Code lautet wie folgt:

Vertrag Wechain:

pragma solidity ^0.4.15;
// ----------------------------------------------------------------------------------------------
// Sample fixed supply token contract
// Enjoy. Guigs. The MIT Licence.
// ----------------------------------------------------------------------------------------------

import './SafeMath.sol';
import './Ownable.sol';

contract Weechain is Ownable{

  using SafeMath for uint256;

  uint256 public energyTotalSupply;
  uint256 public powerTotalSupply;

  struct Device {
    uint256 energyValue;
    uint256 powerValue;
  }
  mapping(address => Device) amount;

  event setEnergyEvent(address indexed device, uint256 energy); 
  event setPowerEvent(address indexed device, uint256 power);
  event setPayloadEvent(uint256 indexed SQN, string payload);

  // Constructor
  function Weechain() {

    energyTotalSupply = 0;
    powerTotalSupply = 0;

    amount[owner].energyValue = energyTotalSupply;
    amount[owner].powerValue = powerTotalSupply;
  }

  function amountOfenergy(address dev) constant returns (uint256 energy) {
    return amount[dev].energyValue;
  }
  function amountOfpower(address dev) constant returns (uint256 power) {
    return amount[dev].powerValue;
  }

  function setPayload(uint256 SQN, string payload) public returns (bool) {

    emit setPayloadEvent(SQN, payload);

    return true;
  }

  function setEnergy(address dev, uint256 energy) public returns(bool) {
    require(dev != address(0));

    amount[dev].energyValue = amount[dev].energyValue.add(energy);
    energyTotalSupply = energyTotalSupply.add(energy);

    emit setEnergyEvent(dev, energy);

    return true;
}

    function setPower(address dev, uint256 power) public returns (bool) {
    require(dev != address(0));

    amount[dev].powerValue = amount[dev].powerValue.add(power);
    powerTotalSupply = powerTotalSupply.add(power);

    emit setPowerEvent(dev, power);

    return true;
  }

}

Bibliothek SafeMath:

pragma solidity ^0.4.15;

library SafeMath {

  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

}

Vertrag Besitzbar:

pragma solidity ^0.4.15;

contract Ownable {

  // Owner of the contract
  address public owner;

  event ChangementOwnership(address indexed _by, address indexed _to);

  function Ownable() {
    owner = msg.sender;
  }


  /// @dev Reverts if called by any account other than the owner.
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) external onlyOwner {
    require(newOwner != address(0));
    owner = newOwner;

    ChangementOwnership(msg.sender, newOwner);
  }

}

Und jetzt habe ich eine HTLM / JavaScript-Anwendung entwickelt, um mit diesem Smart Contract wie folgt zu interagieren:

index.html-Datei:

      <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Weechain Smart Contract</title>

    <link rel="stylesheet" type="text/css" href="main.css">

    <script src="./node_modules/web3/dist/web3.min.js"></script>

</head>
<body>
    <div class="container">

        <h1>Weechain Instructor</h1>
        <p>Output: <span id="owner"></span>
        </p>
        <h2 id="instructor"></h2>

        <label for="name" class="col-lg-2 control-label">Address</label>
        <input id="Address" type="text"> <!--name will be changed to device address-->

        <label for="name" class="col-lg-2 control-label">Energy</label>
        <input id="Energy" type="text"> <!--age will be changed to energy value type = "text" will be type = "number"-->

        <button id="buttonSet">Set</button>

        <button id="buttonGet">Get</button>


    </div>

    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>

    <script>
       if (typeof web3 !== 'undefined') {
           web3 = new Web3(web3.currentProvider);
       } else {
           web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
       }

       web3.eth.defaultAccount = web3.eth.accounts[0];
/*
       var CoursetroContract = web3.eth.contract([{"constant":false,"inputs":[{"name":"_fName","type":"string"},{"name":"_age","type":"uint256"}],"name":"setInstructor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getInstructor","outputs":[{"name":"","type":"string"},{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]);
*/
    var CoursetroContract = web3.eth.contract([{"constant":true,"inputs":[],"name":"energyTotalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"dev","type":"address"}],"name":"amountOfenergy","outputs":[{"name":"energy","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":"powerTotalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"dev","type":"address"},{"name":"energy","type":"uint256"}],"name":"setEnergy","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"SQN","type":"uint256"},{"name":"payload","type":"string"}],"name":"setPayload","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"dev","type":"address"}],"name":"amountOfpower","outputs":[{"name":"power","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"dev","type":"address"},{"name":"power","type":"uint256"}],"name":"setPower","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"device","type":"address"},{"indexed":false,"name":"energy","type":"uint256"}],"name":"setEnergyEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"device","type":"address"},{"indexed":false,"name":"power","type":"uint256"}],"name":"setPowerEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"SQN","type":"uint256"},{"indexed":false,"name":"payload","type":"string"}],"name":"setPayloadEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_by","type":"address"},{"indexed":true,"name":"_to","type":"address"}],"name":"ChangementOwnership","type":"event"}]);

       var Coursetro = CoursetroContract.at('0x39423be68bf4fb3605a7f2b846d81d301b1fd776');

       var utils = require("./utils.js");
var _ = require("lodash");
var Promise = require("bluebird");

module.exports = {
    assertEvent: function(contract, filter) {
        return new Promise((resolve, reject) => {
            var event = contract[filter.event]();
            event.watch();
            event.get((error, logs) => {
                var log = _.filter(logs, filter);
                if (log) {
                    resolve(log);
                } else {
                    throw Error("Failed to find filtered event for " + filter.event);
                }
            });
            event.stopWatching();
        });
    }
}

       $("#buttonGet").click(function() {
       Coursetro.amountOfenergy($("#Address").val(), function(error, result) {
           if (!error) {
               $("#instructor").html(result.toString());//+' ('+result[1]+')');
               /*console.log(result.toString());
               console.log("address\tfrom\t\tto\tamount\tblockHash\tblockNumber\tevent\tlogIndex\ttransactionHash\ttransactionIndex");*/
           } else
                console.log(error);
       });

       });
/*
       $("#buttonSet").click(function() {
           //Coursetro.setPayload($("#name").val(), $("#age").val());
           Coursetro.setEnergy($("#Address").val(), $("#Energy").val());
           //Coursetro.setPayload($("#name").val());
       });
*/
       $("#buttonSet").click(function() {
    var estd_gas = Coursetro.setEnergy.estimateGas($("#Address").val(), $("#Energy").val());
    console.log(estd_gas);
    var params = {
        gas: Math.round(estd_gas * 1.25),
        from: web3.eth.accounts[0]
    };
    Coursetro.setEnergy.sendTransaction($("#Address").val(), $("#Energy").val(), params);
});

    </script>

</body>
</html>

Was ich Schritt für Schritt mache:

öffne ein cmd-Fenster.

testrpc ausführen.

Kopiere die vom Remix erzeugte Vertragsadresse in var Coursetro = CoursetroContract.at('0x9ea9de4056ae3defda58ca02257e7b6218f2e6eb');die Variable.

offene index.htmlund geschnürte Transaktion.

Ich sehe jedoch keine Ausgabe in der HTML-Seite.

Wichtiger Hinweis: Ich habe diese Vorlage und dieses Tutorial verwendet: https://coursetro.com/courses/20/Developing-Ethereum-Smart-Contracts-for-Beginners/lessons/3

Ismael

Erscheint ein Fehler in der Entwicklungskonsole Ihres Browsers?

Fragesteller

@Ismael Ich habe die Lösung gefunden: Konvertieren resultin string. Allerdings würde ich gerne wissen, warum wir konvertieren müssen. Danke

Antworten (1)

Warum erhalte ich mit testRPC und einer grafischen Benutzeroberfläche keinen Rückgabewert der Funktion meines Smart Contracts?

Erscheint ein Fehler in der Entwicklungskonsole Ihres Browsers?
@Ismael Ich habe die Lösung gefunden: Konvertieren resultin string. Allerdings würde ich gerne wissen, warum wir konvertieren müssen. Danke

Fragesteller · Answer 1

Ich habe die Lösung gefunden. resultIch musste nur wie folgt konvertieren string:

$("#instructor").html(result.toString());

Hinweis : Ehrlich gesagt weiß ich nicht, was der Grund ist, aber es funktioniert. Ich bin daran interessiert zu wissen, warum wir konvertieren müssen, resultum stringangezeigt zu werden.

Warum erhalte ich mit testRPC und einer grafischen Benutzeroberfläche keinen Rückgabewert der Funktion meines Smart Contracts?

Fragesteller

Ismael

Fragesteller

Antworten (1)

Fragesteller

Fehler „Ungültige Adresse“ beim Aufruf der Funktion setFoo()

now / block.timestamp funktioniert nicht auf testrpc?

Interaktion mit dem Smart Contract aus der Java-Anwendung (We3j)

Zeigen Sie Daten aus einem anderen Vertrag in Solidity an

Wie bekomme ich "Ereignisprotokolle" ähnlich wie "Remix"?

Falscher Rückgabewert von Web3JS

Warnung: Die Verwendung von "Call" auf niedriger Ebene sollte nach Möglichkeit vermieden werden

Fehler beim Erstellen eines Vertrags - bezogen auf die Zuordnung

Wie finde ich eine Liste der Golem Network Token (GNT) TokenTrader-Verträge?

Wie generiert man eine Solidity-Encode-Funktionssignatur aus Javascript?