vietlq

# JavaScript: HTML5 File drop
# param1 (WebElement): Drop area element
# param2 (int): Optional - Drop offset x relative to the top/left corner of the drop area. Center if 0.
# param3 (int): Optional - Drop offset y relative to the top/left corner of the drop area. Center if 0.

# load minified script
JS_DROP_FILE = "for(var b=arguments[0],k=arguments[1],l=arguments[2],c=b.ownerDocument,m=0;;){var e=b.getBoundingClientRect(),g=e.left+(k||e.width/2),h=e.top+(l||e.height/2),f=c.elementFromPoint(g,h);if(f&&b.contains(f))break;if(1<++m)throw b=Error('Element not interractable'),b.code=15,b;b.scrollIntoView({behavior:'instant',block:'center',inline:'center'})}var a=c.createElement('INPUT');a.setAttribute('type','file');a.setAttribute('style','position:fixed;z-index:2147483647;left:0;top:0;');a.onchange=function(){var b={effectAllowed:'all',dropEffect:'none',types:['Files'],files:this.files,setData:function(){},getData:function(){},clearData:function(){},setDragImage:function(){}};window.DataTransferItemList&&(b.i

vietlq

function readFile(file) {
    var reader = new FileReader();
    var deferred = $.Deferred();

    reader.onload = function(event) {
        deferred.resolve(event.target.result);
    };

    reader.onerror = function() {
        deferred.reject(this);

vietlq

import React, {PropTypes} from 'react';
import classNames from 'classnames';

class BatchDropZone extends React.Component {

    static propTypes = {

        // function that recieves an array of files
        receiveFiles: PropTypes.func.isRequired,

vietlq

rundown of different scripts and what is what and what goes where.

• the prevoutScript is the script of the output being spend
• the redeemScript is the script that is used to solve the P2SH
• the signatureScript is the script that is taken into the signatureHash for signing
• the witnessRedeemScript is the script that is used to solve the P2WSH
• the scriptSig is what goes into the input.scriptSig when serializing the TX
• the witnessScript is what goes into the input.witness when serializing the TX

for a P2KH

vietlq

// JS calling Rust
var addon = require('../native');

console.log(addon.hello());
// -> "hello node"

console.log(addon.adder(1,2));
// -> 3

console.log(addon.objAdder({a: 2, b: 5}));

vietlq

pragma solidity ^0.4.13;

contract someContract {
    
    mapping(address => uint) balances;
    
    function deposit() payable {
        balances[msg.sender] += msg.value;
    }
    

vietlq

/*
In Ethereum, a contract can be written so that it returns a value for eth_call.
A Dapp can then check for success or error value of eth_call, before calling eth_sendTransaction,
to take advantage of eth_call effectively being a "preview" of the code flow that the transaction
will take.  In traditional client-server, clients can't ask servers beforehand what's going to
happen when the client makes a call; with Dapps contracts can be written so that clients can ask
for a "preview" of what is going to happen, before any funds/ethers are actually utilized
(eth_call does not cost any ethers).

Note: it is possible that in between eth_call and when eth_sendTransaction is actually mined,

vietlq

#!/usr/bin/env ruby
require 'open-uri'
require 'JSON'
require 'digest/sha2'
require 'pry'
require 'bigdecimal'
require 'bitcoin' # Because I need to cheat every now and then

# Usage:
# gem install pry json ffi ruby-bitcoin

vietlq

How To TCP NAT Traversal using Node.js and a STUN Server

With the scarecity of IPv4 addresses, and IPv6 still not available at large, NAT traversal is becoming a necessity. Especially with the generalisation of Carrier-grade NATs that you can find on mobile connections. Even with IPv6 you may suffer NAT66. Imagine your mobile device that gets only a single Ipv6 address, and you want to share it on your computer.

The solution might be in a decentralized protocol for address attribution such

vietlq

Table Of Content

Skip to the relevant sections if needed.

• 2-min tutorial to do it the quick-and-dirty-way
• Concepts for resolving Git conflicts
• Setting up different editors / tool for using git mergetool
  • Finding out what mergetool editors are supported
• mergetool simple code example for vimdiff
  • Resolving conflict from a Git pull
• Other great references and tutorials