Preparation :
1. Compiler solc
2.Geth
3. Block data storage location change (windows, not necessary)
4. Contracts (such as: A , B )
Remarks :
solc I installed solcjs with local node.js. The online version is often auntie.
The corresponding compilation command:
solcjs --bin question.sol // binary
solcjs --abi question.sol // abi
---
Geth needs to be in the system environment variable
Get to work:
1. Open a command line anywhere
2. To configure the private chain, please refer to Translation
geth init init.json
{
"nonce": "0x0000000000000042",
"mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"difficulty": "0x20000",
"alloc": {},
"coinbase": "0x0000000000000000000000000000000000000000",
"timestamp": "0x00",
"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"extraData": "blossom"
"gasLimit": "0xffffffff"
}
-- and enter the log into the specified file-- 2 may represent the mode here to indicate the background running log?
geth console 2>> D:/EthereumData/Ethereum/devnet/logs/geth.log --dev --rpc
At this time, enter the console of geth
3. The contract used here is the above A (I changed the question attribute type to bytes before it was String)
pragma solidity ^ 0.4.0;
contract Questions {
//global variables that aren't in a struct
mapping(address => uint) public answers; //integer where 0 means hasn't answered, 1 means yes, 2 means no
bytes question;
address asker;
uint trues;
uint false;
/// __init__
function questions(bytes _question) public {
asker = msg.sender;
question = _question;
}
//We need a way to validate whether or not they've answered before.
//The default of a mapping is
function answerQuestion (bool _answer) public {
if (answers[msg.sender] == 0 && _answer) { //haven't answered yet
answers[msg.sender] = 1; //they vote true
trues + = 1;
}
else if (answers[msg.sender] == 0 && !_answer) {
answers[msg.sender] = 2; //falsity
false + = 1;
}
else if (answers[msg.sender] == 2 && _answer) { // false switching to true
answers[msg.sender] = 1; //true
trues + = 1;
false - = 1;
}
else if (answers[msg.sender] == 1 && !_answer) { // true switching to false
answers[msg.sender] = 2; //falsity
trues - = 1;
false + = 1;
}
}
function getQuestion() public constant returns (bytes, uint, uint, uint) {
return (question, trues, falses, answers[msg.sender]);
}
}
The corresponding abi is:
[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"answers","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_question","type":"bytes"}],"name":"questions","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getQuestion","outputs":[{"name":"","type":"bytes"},{"name":"","type":"uint256"},{"name":"","type":"uint256"},{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}],"type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}],"type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
The corresponding bin is
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
4. Define the contract
abi=[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"answers","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_question","type":"bytes"}],"name":"questions","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getQuestion","outputs":[{"name":"","type":"bytes"},{"name":"","type":"uint256"},{"name":"","type":"uint256"},{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]view","type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]view","type":"function"},{"constant":false,"inputs":[{"name":"_answer","type":"bool"}],"name":"answerQuestion","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
contractQ=eth.contract(abi)
5. Unlock account
personal.unlockAccount(eth.coinbase)
The coinbase of the default private chain has some money, the default password is empty and just press Enter
6. Create and initiate a contract
transQ=contractQ.new({from:eth.coinbase,data:'0x608060405234801561001057600080fd5b50610705806100206000396000f300608060405260043610610062576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff1680635e9618e714610067578063a869765a146100be578063eff38f9214610127578063f9e04961146101cc575b600080fd5b34801561007357600080fd5b506100a8600480360381019080803573ffffffffffffffffffffffffffffffffffffffff1690602001909291905050506101fb565b6040518082815260200191505060405180910390f35b3480156100ca57600080fd5b50610125600480360381019080803590602001908201803590602001908080601f0160208091040260200160405190810160405280939291908181526020018383808284378201915050505050509192919290505050610213565b005b34801561013357600080fd5b5061013c61026e565b6040518080602001858152602001848152602001838152602001828103825286818151815260200191508051906020019080838360005b8381101561018e578082015181840152602081019050610173565b50505050905090810190601f1680156101bb5780820380516001836020036101000a031916815260200191505b509550505050505060405180910390f35b3480156101d857600080fd5b506101f9600480360381019080803515159060200190929190505050610366565b005b60006020528060005260406000206000915090505481565b33600260006101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff160217905550806001908051906020019061026a929190610634565b5050565b6060600080600060016003546004546000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002054838054600181600116156101000203166002900480601f0160208091040260200160405190810160405280929190818152602001828054600181600116156101000203166002900480156103515780601f1061032657610100808354040283529160200191610351565b820191906000526020600020905b81548152906001019060200180831161033457829003601f168201915b50505050509350935093509350935090919293565b60008060003373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020541480156103b15750805b156104105760016000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020819055506001600360008282540192505081905550610631565b60008060003373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1681526020019081526020016000205414801561045c575080155b156104bb5760026000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020819055506001600460008282540192505081905550610630565b60026000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020541480156105065750805b156105765760016000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020819055506001600360008282540192505081905550600160046000828254039250508190555061062f565b60016000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020541480156105c2575080155b1561062e5760026000803373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002081905550600160036000828254039250508190555060016004600082825401925050819055505b5b5b5b50565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f1061067557805160ff19168380011785556106a3565b828001600101855582156106a3579182015b828111156106a2578251825591602001919060010190610687565b5b5090506106b091906106b4565b5090565b6106d691905b808211156106d25760008160009055506001016106ba565b5090565b905600a165627a7a7230582088bb66279f826e4efd502bbbfc2acbac3b299054775e7fff4464485d43b473000029',gas:'4700000'})
The data content is the binary bin of the contract
There will be an entry in the log
Just wait for the miners to mine
7. Check the contract release status
transReceipt=eth.getTransactionReceipt(transQ.transactionHash)
status 0x1 means success 0x0 means failure contractAddress is the contract address
8. Get the contract object through the contract address
entityQ = contractQ.at(transReceipt.contractAddress)
9. Call the query method getQuestion() of the contract
entityQ.getQuestion()
The first call to the question property should be null byte 0x, all others are 0
10. Call the contract method through the transaction transaction questions
txSend = eth.sendTransaction ({ "from": eth.coinbase, "": transReceipt.contractAddress, "data": "0xa869765a00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000014697320636f6e747261637420737563636573733f000000000000000000000000"})
Here is a brief description of the composition of data data, which is more complicated. . Start after 0x
The first 4 bytes--that is, the first 8 bits are the first 8 bits of the sha3 value of the method + parameter type questions(bytes)
The latter parameters are processed differently depending on whether the parameter type is dynamic or static. Dynamically create a placeholder first, and then fill in the specific content. Just fill it in statically, see the documentation for details
note:
This thing is more tiring to do by yourself, it is better to call the method directly and return the result. .
Get the contract object, select the corresponding method questions, call getData, and fill in the parameters will directly generate the required data binary parameters
entityQ.questions.getData("is contract success?")
11. Check the transaction status
eth.getTransaction (txSend)
12. Query the contract's getQuestion() to check for changes
entityQ.getQuestion()
Here the question attribute has changed, and the content is the hexadecimal content of "is contract success?".
This means that the contract has been called successfully. .
references:
end