Solidity

Question

我是 Solidity 的新手，目前，我正在尝试部署一个简单的智能合约，请求 ETH 价格 “LOWDAY” 和“HIGHDAY”。我已经做了一个非常相似的 SC，它只请求“VOLUME24HOUR”，而且效果很好。这是我得到的错误：

contracts/API_Consumer_Info.sol:24:66: DeclarationError: Undeclared identifier. Did you mean "jobID"? Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);

^---^

pragma solidity ^0.6.7;

import "@chainlink/contracts/src/v0.6/ChainlinkClient.sol";

contract APIConsumerInfo is ChainlinkClient
{
uint256 public lowDay;
uint256 public highDay;

address private oracle;
bytes32 private jobID;
uint256 private fee;

constructor() public
{
    setPublicChainlinkToken();
    oracle = 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e;
    jobID = "29fa9aa13bf1468788b7cc4a500a45b8";
    fee = 0.1 * 10 ** 18;
}

function requestLowDay() public returns (bytes32 requestID)
{
    Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);  //Error occur here
    request.add("get", "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD");
    request.add("path", "RAW.ETH.USD.LOWDAY");
    int timesAmount = 10**2;
    request.addInt("times", timesAmount);
    return sendChainlinkRequestTo(oracle, request, fee);
}

function fulfill(bytes32 _requestId, uint256 _dayLow) public recordChainlinkFulfillment(_requestId)
{
    lowDay = _dayLow;
}

function requestHighDay() public returns (bytes32 requestID)
{
    Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);  //Error occur here
    request.add("get", "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD");
    request.add("path", "RAW.ETH.USD.HIGHDAY");
    int timesAmount = 10**2;
    request.addInt("times", timesAmount);
    return sendChainlinkRequestTo(oracle, request, fee);
}

function fulfill(bytes32 _requestId, uint256 _dayHigh) public recordChainlinkFulfillment(_requestId)
{
    highDay = _dayHigh;
}

function withdrawLink() external 
{
    LinkTokenInterface linkToken = LinkTokenInterface(chainlinkTokenAddress());
    require(linkToken.transfer(msg.sender, linkToken.balanceOf(address(this))), "Unable to transfer");
}
}

基本代码不是我写的，它与“VOLUME24HOUR”调用完美配合。当我对 request.add("path") 进行必要的更改并添加新变量 lowDay/highDay 时，它开始抛出错误。

谢谢 ʕっ•ᴥ•ʔっ

Answer 1

Solidity 变量名称区分大小写。

您已经定义了一个名为 jobID（大写 D）的 bytes32 属性，但是您试图传递 jobId（小写 d).

解决方法：传递正确的区分大小写的变量名。在你的情况下 jobID.

Solidity - 简单 API 请求 - 未声明的标识符问题

Solidity - Simple API request - Undeclared identifier problem

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