当我使用编译器的输出发布新的契约时,我会得到一个javascript对象"somecontract",我可以调用它的方法,比如:"somecontact.doSomething();"
但是,我如何与过去某个时候发布到区块链的合同进行交互?
如果您已经有了合同地址,请跳到下面的代码片段。如果没有,你需要找到它。
- 在etherchain.org上查找合同发布的账户
- 查找用于创建合同的交易记录。这将是"新合同"中的一行
- 最后,在geth中,获取交易收据,合同地址将是收据的"contractAddress"属性
要获得abi,请重新编译您的合同(通常在此处https://chriseth.github.io/browser-solidity/)。既然你有了abi和合同地址,你就可以重新访问合同了。
var abi = <cut and paste the contract abi here>;
var contract = web3.eth.contract(abi).at(<contract address>);
contract.functionname();
contract.functionname.sendTransaction(...);
这是来自https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/05_greeter.sol
[{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"},
{"constant":true,"inputs":[],"name":"getBlockNumber","outputs":[{"name":"","type":"uint256"}],"type":"function"},
{"constant":false,"inputs":[{"name":"_newgreeting","type":"string"}],"name":"setGreeting","outputs":[],"type":"function"},
{"constant":true,"inputs":[],"name":"greet","outputs":[{"name":"","type":"string"}],"type":"function"},{"inputs":[{"name":"_greeting","type":"string"}],"type":"constructor"}]