如何從單個合約呼叫多個 oracalisized 查詢

我想從同一個合約中呼叫 2 個不同的 orcalized 查詢。我看到了一些文章，但沒有一個答案有效。我們有什麼辦法可以做到嗎？這是我的契約。我期待這份契約同時記錄兩者11111111，222222222222222但它列印錯誤VM Exception: invalid opcode我正在使用http://dapps.oraclize.it/。當我呼叫單個查詢時，它有效，但不是 2 個查詢。

   pragma solidity ^0.4.0;
import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";
import "github.com/Arachnid/solidity-stringutils/strings.sol";

contract verifySettlement is usingOraclize {

   uint public price;
   string public landingtime;
   string public expectedtime;`
   string public tempvalue;
   mapping(bytes32 => uint) queries;

   event Log(string text);

   function verifySettlement() payable {
       Log("Contract created.");
       getActualFlightDetails();
       getExpectedFlightDetails();
   }

   function getActualLandingHour() constant returns (string) {
      return landingtime;
   }

   function getExpectedLandingHour() constant returns (string) {
      return expectedtime;
   }

   function __callback(bytes32 _myid, string _result) {
       require (msg.sender == oraclize_cbAddress());
       if(queries[_myid] == 1)
       {
           Log("1111111111111111111111111");
       }
       if(queries[_myid] == 2)
       {
           Log("2222222222222222222222222222222");
       }
       //Log(_result);
       //tempvalue = _result;
   }

   function getActualFlightDetails() payable {
       Log("Oraclize query was sent, waiting for the answer for getting actual flight details..");
       queries[oraclize_query("URL","http://169.53.241.139:5000/actual/flight/1")]=1;
       //queries[oraclize_query("URL","http://169.53.241.139:5000/expected/flight/1")]=2;
   }

   function getExpectedFlightDetails() payable {
       Log("Oraclize query was sent, waiting for the answer for getting actual flight details..");
       //queries[oraclize_query("URL","http://169.53.241.139:5000/expected/flight/1")]=1;
       queries[oraclize_query("URL","http://169.53.241.139:5000/expected/flight/1")]=2;
   }



}

中的第一個參數將id在__callback同一個回調函式中處理不同的請求。

contract verifySettlement is usingOraclize {

uint public price;
string public landingtime;
string public expectedtime;`
string public tempvalue;


 event Log(string text);

 enum oraclizeState { ForActual, ForExpected }

  struct oraclizeCallback {
       oraclizeState oState;
 }
 mapping (bytes32 => oraclizeCallback) public oraclizeCallbacks;

function verifySettlement() payable {
   Log("Contract created.");
   getActualFlightDetails();
   getExpectedFlightDetails();
}

function getActualLandingHour() constant returns (string) {
  return landingtime;
}

function getExpectedLandingHour() constant returns (string) {
  return expectedtime;
}

function __callback(bytes32 _myid, string _result) {
    require (msg.sender == oraclize_cbAddress());
    oraclizeCallback memory o = oraclizeCallbacks[myid];
            if (o.oState == oraclizeState.ForActual) {
                          Log("1111111111111111111111111");
             }
             else if(o.oState == oraclizeState.Forxpected) {
                          Log("2222222222222222222222222222222");   
            }
}

function getActualFlightDetails() payable {
   Log("Oraclize query was sent, waiting for the answer for getting actual flight details..");
    bytes32 queryId=oraclize_query("URL","http://169.53.241.139:5000/actual/flight/1");
    oraclizeCallbacks[queryId] = oraclizeCallback(oraclizeState.ForActual);
}

function getExpectedFlightDetails() payable {
   Log("Oraclize query was sent, waiting for the answer for getting actual flight details..");

    bytes32 queryId=oraclize_query("URL","http://169.53.241.139:5000/expected/flight/1");
     oraclizeCallbacks[queryId] = oraclizeCallback(oraclizeState.ForExpected);
}
}

為了跟踪不同的查詢，我們使用 struct 來保存和定義 queryid 和查詢狀態之間的映射。

引用自：https://ethereum.stackexchange.com/questions/40781