如何从latestrounddata（）转换返回值？
我一直在遵循有关链链接文档的教程，以获取使用Matic/USD Mumbai TestNet数据feed的Matic的当前价格，函数getLatestPrice（）返回65990700。我读到latestrounddata（）返回WEI中的值。然后，当我使用此网站对其进行转换时值得matic。我得到了0.0000000065485509 Matic。
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
contract PriceConsumerV3 {
AggregatorV3Interface internal priceFeed;
/**
* Network: Mumbai
* Aggregator: MATIC/USD
* Address: 0xd0D5e3DB44DE05E9F294BB0a3bEEaF030DE24Ada
*/
constructor() {
priceFeed = AggregatorV3Interface(0xd0D5e3DB44DE05E9F294BB0a3bEEaF030DE24Ada);
}
/**
* Returns the latest price
*/
function getLatestPrice() public view returns (int) {
(
/*uint80 roundID*/,
int price,
/*uint startedAt*/,
/*uint timeStamp*/,
/*uint80 answeredInRound*/
) = priceFeed.latestRoundData();
return price;
}
}
我想念什么吗？
I've been following a tutorial on chainlink documentation, to get the current price of Matic using MATIC/USD Mumbai Testnet Data feed, the function getLatestPrice() returns 65990700. I read that latestRoundData() returns the value in Wei. Then when I converted it using this website https://polygonscan.com/unitconverter to see how much this value is worth of Matic. I got 0.000000000065485509 Matic.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
contract PriceConsumerV3 {
AggregatorV3Interface internal priceFeed;
/**
* Network: Mumbai
* Aggregator: MATIC/USD
* Address: 0xd0D5e3DB44DE05E9F294BB0a3bEEaF030DE24Ada
*/
constructor() {
priceFeed = AggregatorV3Interface(0xd0D5e3DB44DE05E9F294BB0a3bEEaF030DE24Ada);
}
/**
* Returns the latest price
*/
function getLatestPrice() public view returns (int) {
(
/*uint80 roundID*/,
int price,
/*uint startedAt*/,
/*uint timeStamp*/,
/*uint80 answeredInRound*/
) = priceFeed.latestRoundData();
return price;
}
}
am I missing something ?
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ChainLink USD DataFeeds以8个小数的精度返回价格数据，而不是18。
如果要将值转换为18个小数，则可以将10个零添加到结果：
请参阅指定的 Decimals 函数在指定的< a href =“ https://mumbai.polygonscan.com/address/0xd0d5e3db44de05e9f294bb0a3beeaf030de24ada#readcontract”
Chainlink USD datafeeds return price data with 8 decimals precision, not 18.
If you want to convert the value to 18 decimals, you can add 10 zeros to the result:
See the
decimalsfunction output on the specified feed contract.