Solidity Examples

Before geth 1.6, a Solidity file could be compiled from within geth. The file had to be prepared and newlines had to be removed

#old, does not work anymore since geth 1.6
grep -o '^[^//]*' example1.sol | tr --delete '\n\t' > /tmp/test.js

Since geth 1.6 it can be done with the following command

echo "var testOutput=`solc --optimize --combined-json abi,bin,interface Test.sol`" > test.js

As reported here. The issue is reported here.

First Example

The first example (example1.sol) is a very simple contract

pragma solidity ^0.4.10;

//the very first example
contract Example1 {
        uint stateVar;
}

Make sure you have started geth before

geth --testnet --fast --rpc --rpcapi eth,web3,personal,net,miner,admin
geth --testnet attach http://127.0.0.1:8545

run the deploy script deploy.sh

./deploy.sh example1.sol

Now switch to the attached geth console and load the resulting script

loadScript("/tmp/test.js")

Eventually, you'll see something like this

Contract mined! address: 0xfb821bf9e66a5decb43a92fc615bbbdb296df462 transactionHash: 0xda816929b1764fa9736f02505e94bfdeace098a4348057ddacb0baf466dfda5e

You have mined you first contract!

Example 2

Now we'll store a state and access the state