ethereum/tutorials

Ethereum Documentation - http://ethdocs.org

hadrienmajoie

@hadrienmajoie

@PntA2B_twitter I had some similar problems.

@PntA2B_twitter you need to install ethereum wallet on Ubuntu and not Debian to start with. Second: check the size of your Json file. Is it empty? (Try to cat it). Is the extension file correct?

Srini Chakwal

@srininet_twitter

looking blockchain expertise to setup crowdsale.

girishlalwani2010

@girishlalwani2010

hello can i create contracts on ethereum network using ethereumj

like i do using mist browser

kuldeep-agg

@kuldeep-agg

May i know the difference bettween ethereumjs-library and web3.js

Bob Summerwill

@bobsummerwill

Hey @kuldeep-agg,
ethereumjs-lib is an implementation of the EVM written in Javascript. So it is RUNNING a node.
web3.js is a JS library for talking to a node over JSON-RPC. It can talk to any compliant node, whatever language they are written in. web3.js is usually what you use to join the front-end of your DAPP with the back-end (the blockchain).

kuldeep-agg

@kuldeep-agg

Thanks @bobsummerwill :+1:

marwanfarah

@marwanfarah

Hello, I am new, I want to know where can I go to learn how to write a contract and code samples etc.. thanks a million.

@alexvandesande Please direct to where can I start learning about writing a contract and some samples of codes, thanks.

Alex Van de Sande

@alexvandesande

@marwanfarah in which page are you on right now? Have you tried ethereum.org?

Bob Summerwill

@bobsummerwill

Hey @marwanfarah,
Head to http://solidity.readthedocs.io/en/latest/

marwanfarah

@marwanfarah

@alexvandesande @bobsummerwill thanks a million. I went through ethereum.org, I could get lost before finding code. I am at readthedocs it seems that I have a lot of material to go through. perfect, thanks again.

Alex Van de Sande

@alexvandesande

@marwanfarah you can also try ethereum.org/token or one of the specific pages. Have a blast at it ;-)

marwanfarah

@marwanfarah

thanks :)

uvizhe

@uvizhe

Hello again :) Can anyone explain why my transactions fail to get confirmed? I can't transfer ether to my wallet. Transactions just appear, hang some time unconfirmed and disappear and nothing changes.

ARK_1001

@ARK_1001_twitter

HELP

uvizhe

@uvizhe

Ah sorry, I used wrong chatroom to ask this question

Rémy Roy

@remyroy

Hello, I'm trying to complete the greeter example on https://www.ethereum.org/greeter . I'm stuck at trying to deploy my contract using geth. Do you need to have your account unlocked to call somecontract.new([constructorParam], {from: accountAddress, ...], ...) to deploy a contract? Nothing happens when I'm trying to deploy my contract. I'm guessing it cannot take funds from my locked account and it does not ask me to unlock it.

keuge

@keuge

https://i.snag.gy/iu4pO3.jpg i guess its not mint? but mine?

Alex Van de Sande

@alexvandesande

@keuge it’s mint. As in Central Mint, the place that creates coins out of thin air. Mining is a specific name for rewarding in cryptocurrency in exchange of network security

keuge

@keuge

contract MyToken {
uint256 public totalSupply;

function MyToken(...) {
    totalSupply = initialSupply;
    ...
}
...

}

Alex Van de Sande

@alexvandesande

@keuge what is the question?

keuge

@keuge

what is this? where do i need to implement? why is it ..., instead of info?

Alex Van de Sande

@alexvandesande

Not sure I understand the question

This is called the constructor function

keuge

@keuge

"..." represent what?

First we need to add a variable to store the totalSupply and assign it in our constructor function. and then this code is ongoing. Its from here - https://ethereum.org/token#central-mint

i dont understant what do i need to paste to contract

Alex Van de Sande

@alexvandesande

Ah.. It represents the rest of the contract

Compare it to the original token contract and you’ll see where to add this

Carl Forsbacka

@CarlForsbacka_twitter

I Have ,made these. snow catchers and i live in Finland. Nestle wanna buy our waters. i have few hundred thousand litres of water. I want to make Water Coin. http://fp.chatango.com/profileimg/b/r/braincell83/full.jpg then Colladial Coin Anfd Ormus coin, http://www.tomsormuswater.com/index.php#order i can make colladial and ormus water. Have talked with selllers and other people that could invest in these coins, So i need help from somebody to make this coin. or a partner . so alone woth this ....

Alex Van de Sande

@alexvandesande

@CarlForsbacka_twitter try posting about it on reddit.com/r/ethereum

samsa90

@samsa90

Hi all, i have a big problem. I have create a contract from this site: http://chriseth.github.io/browser-solidity/?#gist=21935dc37c5bfbe92e5a and with 8.65 ethers from my admin wallet. So the contract is failed because not enough GAS but my ethers away for that contract. i don't know how i get back my ethers!?

Alex Van de Sande

@alexvandesande

@samsa90 why did you send 8.65 ethers to a token contract?

samsa90

@samsa90

don't ask me :) in "my own contracts" is the contract with the ethers but i can't delete it and get the ethers back to my admin account

Alex Van de Sande

@alexvandesande

That is true, you can’t delete contracts from the blockchain and you can’t get it back once you sent it

So that ether is probably lost now. I recommend you do testing with test ether, so you won’t risk real money

samsa90

@samsa90

the process from the contract creating...

from which account
how much ether
than you can insert some code and that is what i do.. the code from this link from below

Alex Van de Sande

@alexvandesande

Yes. That is the right process. But you don’t need to send ether for a contract, the fee will be added later.

samsa90

@samsa90

and the transaction is not "created"... the transaction doesn't successful create because not enough GAS... i don't understand this logic.. i have a contract but the transaction doesn't successful :/

Alex Van de Sande

@alexvandesande

Did you move the gas fee slider?

samsa90

@samsa90

gas fee slider?

Alex Van de Sande

@alexvandesande

This guy

samsa90

@samsa90

i can't see it at the moment when i click to the transaction

Alex Van de Sande

@alexvandesande

You can’t see now, but do you remeber it?

samsa90

@samsa90

yes

Alex Van de Sande

@alexvandesande

Do you remember moving it?

Do you have the transaction ID you sent?

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