關於智能合約中的 Oraclize 呼叫

我有兩個使用 Oraclize 呼叫的函式。我必須一個接一個地/或同時呼叫這些函式。

供您參考的範常式式碼：-

pragma solidity ^0.4.0;

import "./usingOraclize.sol";

contract WeatherApiCall is usingOraclize {


     // oraclize callback types:
     enum oraclizeState { ForWeatherCondition, ForDistance }

     //Events
     event LOG_OraclizeCallbackForDistance(
               string result,
               bytes proof
     );

     event LOG_OraclizeCallbackForWeatherCondition(
               string result,
               bytes proof
     );

      // the oraclize callback structure: we use several oraclize calls.
      // all oraclize calls will result in a common callback to __callback(...).
      // to keep track of the different querys we have to introduce this struct.
     struct oraclizeCallback {
               // for which purpose did we call? {ForWeatherCondition | ForDistance}
                 oraclizeState oState;
     }
     // Lookup policy State from queryIds
     mapping (bytes32 => oraclizeCallback) public oraclizeCallbacks;

     address  public user;
     string public places1;
     string public from1;
     string public to1;
     uint public persons1;
     string public datetime1;          

     // constructor
     function WeatherApiCall() {
             OAR = OraclizeAddrResolverI(0x6f485C8BF6fc43eA212E93BBF8ce046C7f1cb475);
             oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
             user=msg.sender;
     }
     //Function for distance retrieval
     function distanceRetrieve(string places,string from,string to,uint persons,string datetime) payable returns(bool sufficient) {

           places1=places;
           from1=from;
           to1=to;
           persons1=persons;
           datetime1=datetime;


         //   weatherconditionRetrieve(to1,datetime1);
           bytes32 queryId = oraclize_query(10,"URL",strConcat("json(http://www.distance24.org/route.json?stops='", places1 ,"').distance"));
         //  weatherconditionRetrieve(to1,datetime1);
           oraclizeCallbacks[queryId] = oraclizeCallback(oraclizeState.ForDistance);
          // weatherconditionRetrieve(to1,datetime1);
           return true;
     }

     function weatherconditionRetrieve(string to,string datetime) payable returns(bool sufficient) {



              bytes32 queryId =  oraclize_query(30,"URL", strConcat("json(http://api.openweathermap.org/data/2.5/forecast?q='", to ,"'&mode=json&APPID=d2e8279188c8649c17540f798c9cc972).list[?(@.dt_txt='", datetime, "')].weather[0].description"));
              oraclizeCallbacks[queryId] = oraclizeCallback(oraclizeState.ForWeatherCondition);
              return true;
     }
     //Function callback
     function __callback(bytes32 myid, string result,bytes proof) {

                if (msg.sender != oraclize_cbAddress()) throw;
                oraclizeCallback memory o = oraclizeCallbacks[myid];
                if (o.oState == oraclizeState.ForDistance) {
                              LOG_OraclizeCallbackForDistance(result,proof);
                            //  weatherconditionRetrieve(to1,datetime1);
              }
                else if(o.oState == oraclizeState.ForWeatherCondition) {
                              LOG_OraclizeCallbackForWeatherCondition(result,proof);
                }

     }


}

要求 ：-

我必須呼叫distanceRetrieve()函式並將值初始化為變數……而且，我必須weatherconditionRetrieve()與distanceRetrieve()函式一起呼叫或在distanceRetrieve()函式之後呼叫。

如何weatherconditionRetrieve()在distanceRetrieve()功能內安排？

我已經嘗試了很多方法……但它失敗了……任何幫助表示讚賞？

當我在回調中呼叫 weatherconditionRetrieve() 函式時，Oraclize 控制台中出現問題。

[2017-06-02T05:51:34.829Z] INFO sending __callback tx...
{"contract_myid":"0x525545b08922b850ea8a708b38753a2555ab3c71e9b24559953a4b25f0ae6173","contract_address":"0x904e6ce8e6ceb3c88da5256a0265d723798ed0a3"}
[2017-06-02T05:51:36.159Z] ERROR callback tx error, contract myid: 0x525545b08922b850ea8a708b38753a2555ab3c71e9b24559953a4b25f0ae6173
   {"message":"VM Exception while processing transaction: invalid JUMP  at  1a5420ab3442aabc0faea0c7124658f9bb10f45fbecdc1461be909a62f6503b9/904e6ce8e6ceb 3c88da5256a0265d723798ed0a3:9414","stack":"Error: VM Exception while    processing transaction: invalid JUMP at  1a5420ab3442aabc0faea0c7124658f9bb10f45fbecdc1461be909a62f6503b9/904e6ce8e6ceb 3c88da5256a0265d723798ed0a3:9414\n    at Object.InvalidResponse (/home /toshiba/ethereum-bridge-master/node_modules/web3/lib/web3/errors.js:35:16)\n    at /home/toshiba/ethereum-bridge-master /node_modules/web3/lib/web3/requestmanager.js:86:36\n    at  XMLHttpRequest.request.onreadystatechange (/home/toshiba/ethereum-bridge-master/node_modules/web3/lib/web3/httpprovider.js:118:13)\n    at XMLHttpRequestEventTarget.dispatchEvent (/home/toshiba/ethereum-bridge-master/node_modules/xhr2/lib/xhr2.js:64:18)\n    at XMLHttpRequest._setReadyState (/home/toshiba/ethereum-bridge-master/node_modules/xhr2/lib/xhr2.js:354:12)\n    at XMLHttpRequest._onHttpResponseEnd (/home/toshiba/ethereum-bridge-master/node_modules/xhr2/lib/xhr2.js:509:12)\n    at IncomingMessage.<anonymous> (/home/toshiba/ethereum-bridge-master/node_modules/xhr2/lib/xhr2.js:469:24)\n    at emitNone (events.js:91:20)\n    at IncomingMessage.emit (events.js:185:7)\n    at endReadableNT (_stream_readable.js:974:12)\n    at _combinedTickCallback (internal/process/next_tick.js:74:11)\n    at process._tickCallback (internal/process/next_tick.js:98:9)"}
[2017-06-02T05:51:36.229Z] ERROR transaction hash not found, callback tx database not updated

您似乎沒有支付 Oraclize 費用。請為您的合約添加一些資金並重試，請記住只有第一次查詢是免費的。

引用自：https://ethereum.stackexchange.com/questions/17015