Here's your function slightly modified:
contract C { uint[] public numbers; function initNumbers() { numbers.push(1); numbers.push(2); } function stateChanger(uint a) { numbers.push(a); } } Using the stripCrLf script in How to load Solidity source file into geth, I've flattened the source code using the following command:
echo "var cSource='`stripCrLf C.sol`'" var cSource='contract C { uint[] public numbers; function initNumbers() { numbers.push(1); numbers.push(2); } function stateChanger(uint a) { numbers.push(a); } }' I'm running a dev network using the following command (I have my password in passwordfile):
geth --datadir ~/devdata --dev --mine --minerthreads 1 --unlock 0 --password ~/passwordfile console I paste the flattened code in the geth command line:
> var cSource='contract C { uint[] public numbers; function initNumbers() { numbers.push(1); numbers.push(2); } function stateChanger(uint a) { numbers.push(a); } }' undefined And compile the code using the following command:
var cCompiled = web3.eth.compile.solidity(cSource); Version: 0.3.5-0/RelWithDebInfo-Linux/g++/Interpreter path: /usr/bin/solc undefined Here is the Application Binary Interface:
cCompiled.C.info.abiDefinition [{ constant: false, inputs: [], name: "initNumbers", outputs: [], type: "function" }, { constant: false, inputs: [{ name: "a", type: "uint256" }], name: "stateChanger", outputs: [], type: "function" }, { constant: true, inputs: [{ name: "", type: "uint256" }], name: "numbers", outputs: [{ name: "", type: "uint256" }], type: "function" }] Deploy the contract on the blockchain:
var cContract = web3.eth.contract(cCompiled.C.info.abiDefinition); var c = cContract.new({ from:web3.eth.accounts[0], data: cCompiled.C.code, gas: 400000}, function(e, contract) { if (!e) { if (!contract.address) { console.log("Contract transaction send: TransactionHash: " + contract.transactionHash + " waiting to be mined..."); } else { console.log("Contract mined! Address: " + contract.address); console.log(contract); } } }) Contract mined! Address: 0x672807a8c0f72a52d759942e86cfe33264e73934 Call your initNumbers():
> c.initNumbers({from:eth.accounts[0], gas: 400000}) "0x3f21e1cdb636a2cf291cd9296282a4e9c4f4ed57c65a13fedc937a97203c3a75" > c.numbers(0) 1 > c.numbers(1) 2 > c.numbers(2) 0 Calling stateChanger(...) - Method 1
c.stateChanger(3, {from:eth.accounts[0], gas: 400000}) "0x3ecf3aa6464f93d5b062ad01b76b5dbc4302c190baf70d157a4d7607d4c7c749" ... > c.numbers(2) 3 > c.numbers(3) 0 Calling stateChanger(...) - Method 2
> c.stateChanger.sendTransaction(4, {from: eth.accounts[0], gas: 400000}) "0xe1d9c57ca55dbdf446e55602570888ff5efce97a91ddc5c9575d10c7c9a1f0c8" ... > c.numbers(3) 4 > c.numbers(4) 0 Calling stateChanger(...) - Method 3
And following is how to use the raw data sendTransaction(...) format.
Find the function signature. Note that the uint parameter is actually a uint256 (see the ABI format above):
> web3.sha3('stateChanger(uint256)').substr(0, 10) "0x65060775" Here is 5 encoded in hex and padded to 32 bytes:
0x0000000000000000000000000000000000000000000000000000000000000005 Join the data together, removing the 0x from the hex(5) string:
0x650607750000000000000000000000000000000000000000000000000000000000000004 Here's how to sendTransaction(...). The to: parameter is the address of the mined contract:
> var result = web3.eth.sendTransaction({ from: eth.accounts[0], to: "0x672807a8c0f72a52d759942e86cfe33264e73934", data: "0x650607750000000000000000000000000000000000000000000000000000000000000005", gas: 400000} ) undefined > result "0x420d4256718b4326967677da2e460a1d361a62f3ceee386e1313d25b12c0f610" ... > c.numbers(4) 5 > c.numbers(5) 0 Bonus 1 - estimateGas(...)
Since we have worked out the data to send with sendTransaction(...) above.
Here is the gas used by the sendTransaction(...) call above:
> eth.getTransactionReceipt(result).gasUsed 46888 You can use the same data format to estimate the gas using the estimateGas(...) call:
var result = web3.eth.estimateGas({ from: eth.accounts[0], to: "0x672807a8c0f72a52d759942e86cfe33264e73934", data: "0x650607750000000000000000000000000000000000000000000000000000000000000005", gas: 400000} ) undefined > result 46888 Bonus 2 - The Transaction Data
Set debug.verbosity(7) and watch the transaction get removed from the transaction pool after it is executed:
> debug.verbosity(7) ... I0730 00:13:43.918828 core/tx_pool.go:547] removed tx ( TX(07c3c717c87ce1e2b31ba144b6b751d66c90a8a69375478a5ef4e60a6f42996c) Contract: false From: a7857047907d53a2e494d5f311b4b586dc6a96d2 To: 672807a8c0f72a52d759942e86cfe33264e73934 Nonce: 35 GasPrice: 20000000000 GasLimit 400000 Value: 0 Data: 0x650607750000000000000000000000000000000000000000000000000000000000000004 V: 0x1c R: 0x75ff67a969670a0f35ae415f2fa541446a71fa9b7d8ad6247ad12fd7ae3986a S: 0x7150424ed1698792cdcf1253a79f2474e4df411610db97e36240bab50af6c80c Hex: f889238504a817c80083061a8094672807a8c0f72a52d759942e86cfe33264e7393480a46506077500000000000000000000000000000000000000000000000000000000000000041ca0075ff67a969670a0f35ae415f2fa541446a71fa9b7d8ad6247ad12fd7ae3986aa07150424ed1698792cdcf1253a79f2474e4df411610db97e36240bab50af6c80c ) from pool: low tx nonce or out of funds