我陷入了可靠的代码中。我想要以下数据的子字符串并将其转换为 uint256 数据
bytes32 hmacSha256 = 0xf83bf40815929b2448b230d51fa2eaa5b8ccffd87691db7e62bf817b2cbb56ad;
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我想要上述 hmacSha256 数据的前 13 个字符,即“f83bf40815929”及其 uint256 即。4366982094870825。我尝试了很多方法但都失败了。代码和尝试过的代码如下:
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Storage
* @dev Store & retrieve value in a variable
*/
contract TestContract {
function getsubstring1() public pure returns (string memory, uint256, string memory) {
bytes32 hmacSha256 = 0xf83bf40815929b2448b230d51fa2eaa5b8ccffd87691db7e62bf817b2cbb56ad;
bytes memory tempH = bytes(abi.encodePacked(hmacSha256));
uint256 uintHash = uint256(hmacSha256);
//I want below values as result.
// _hs is first 13 chars of hmacSha256.
//neither i could derive …Run Code Online (Sandbox Code Playgroud) solidity ×1