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Showing posts with the label #MetaMask

Crypto-Currency "Coin Contract" Example

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So here is my starting point pragma solidity ^0.4.18; //Used like an Interface in C# or Java contract Token { function totalSupply() public constant returns (uint256 supply) {} function balanceOf(address _owner) public constant returns (uint256 balance) {} function transfer(address _to, uint256 _value) public returns (bool success) {} function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {} function approve(address _spender, uint256 _value) public returns (bool success) {} function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {} //needed to Log the Events event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } contract StandardToken is Token { mapping (address => uint256) balances; mapping (address => mapping (address => uint25...
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Creating Decentralized Apps Part 2

In this post i will be using javascript to call a contract deployed using Remix IDE and ethereum-js Test RPC(nodeJs) The contract being deployed is pragma solidity ^0.4.0; contract NumberGetNextNumberAresh{ uint index; function getNumber() returns (uint) { index = index + 1; return index; } function myConstantMethod(string a) constant returns (string d) { return a; } function myConstantNumber() constant returns (uint) { return index; } } To get the ABI or  "Interface ABI"   Follow this POST for the "Contract Address" Follow this POST After Deploying you should now be ready to create a UI (interface with html) The html will contain javascript as well <html> <head> <title>Smart Contract Ethereum</title> </head> <body> <fieldset> <button onclick="send()">Send Data</button> <button onclick="...
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Send Ether using Javascript and Html

In this post i will be using an html file and javascript to send Ether from one account to another account. the Ideal scenario is "Donations". From one account to another account(Author/Organization). In this process i will make use of Metamask and Web3 and Ropsten Test Net. An Event listener waits for the load of the website and checks if its Web3 Compatible, before proceeding. For the Chrome browser to be Web3 Compatible, it needs to have Metamask installed. Note: You cant run this on your computer as an Html File  Due to browser security restrictions . you will need a web server such as Apache or IIS . <html> <head> <title>Smart Contract Ethereum Aresh</title> </head> <body> <fieldset> <label> Ether: <input type="text" id="amount"></input> </label> <button onclick="sendmoney()">Donate to Aresh</button> <div id="response"...
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Testing using MetaMask Part 1 "Getting Ether"

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Download MetaMask On Chrome Browser Accept The "Privacy Notice" Accept The "Terms of Use" Give it a "Password" you wont forget Copy the "Vault" Created to an external text file and save it Select the "Ropsten Test Network" You currently have Zero Ether. Click "Buy" Click the "Ropsten Test Faucet" to open the website Click the "Request 1 Ether from Faucet" and wait for a few seconds Verify from your MetaMask that you have the 1 Ether. Whenever you run out of test ether, you can always request again using the same process
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