如何使用“eth_sendTransaction”呼叫合約並獲取日誌？

我已經部署：

contract test { 
     function multiply(uint a) returns(uint d) { 
              return a * 7;
     }
}

我可以用“ eth_call ”呼叫合約：

mpsp@ubuntu-slave2:~$ curl http://10.10.67.217:8545 --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"to": "0x8e6f99f04148b1fb918cde7e44a94375f94dc745","data":"0xc6888fa10000000000000000000000000000000000000000000000000000000000000007"},"latest"],"id":1}'

輸出是：

{"jsonrpc":"2.0","id":1,"result":"0x0000000000000000000000000000000000000000000000000000000000000031"}

但是當我使用“ eth_sendTransaction ”呼叫合約時，挖礦後使用“ eth_getTransactionReceipt ”得到結果，合約似乎沒有被呼叫。這是我的步驟：

eth_sendTransaction

run:       mpsp@ubuntu-slave2:~$ curl http://10.10.67.217:8545 --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{"from":"0xc60ec7c68d47814288bdfdaa71b88ff922d735a7","to":"0x8e6f99f04148b1fb918cde7e44a94375f94dc745","gas":"0xC350","gasPrice":"0x1388","data":"0xc6888fa10000000000000000000000000000000000000000000000000000000000000003"}],"id":1}'
outputs:   {"jsonrpc":"2.0","id":1,"result":"0xcff6d91d1693abe876c25ba03a58bc6ca693078b3a90e836f656e0dddb08a4cd"}

eth_getTransactionReceipt

run:        curl http://10.10.67.217:8545 --data '{"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xcff6d91d1693abe876c25ba03a58bc6ca693078b3a90e836f656e0dddb08a4cd"],"id":1}'
outputs:    {"jsonrpc":"2.0","id":1,"result":{"blockHash":"0x26e23d45caf0c57159e88d9835c573a79f59a4fad0e7a7d70ea7a49780d14448","blockNumber":"0xc3a1","contractAddress":null,"cumulativeGasUsed":"0x5449","from":"0xc60ec7c68d47814288bdfdaa71b88ff922d735a7","gasUsed":"0x5449","logs":[],"root":"c42b14419677df59e3f593fccf03ea28f65bbd8927dcc9239dad6e77eb85f1a3","to":"0x8e6f99f04148b1fb918cde7e44a94375f94dc745","transactionHash":"0xcff6d91d1693abe876c25ba03a58bc6ca693078b3a90e836f656e0dddb08a4cd","transactionIndex":"0x0"}}

eth_getTransactionReceipt 輸出中的日誌為空。

你有什麼建議嗎？

謝謝！

測試合約沒有發出事件，這就是沒有日誌的原因。返回值不會自動包含在日誌中。

嘗試：

contract test { 
     event R(uint x);
     function multiply(uint a) returns(uint d) { 
              R(a * 7);
              return a * 7;
     }
}

如果這不起作用，您可能需要增加汽油（您還剩下大約 28,423 汽油）。

除了使用事件之外，如果我真正想做的只是在交易收據中生成日誌條目，我有時會發現直接呼叫“低級”Solidity 日誌功能更簡單：

log1( value, 'log_topic');

將創建一個包含value主題的日誌條目"log_topic"。

log2(value,topic1,topic2)允許您創建一個包含 2 個主題的條目，依此類推。

連結到 Solidity 文件

引用自：https://ethereum.stackexchange.com/questions/4608