11-2-ABI解码-decode
ABI Decode
abi.encode将数据编码为bytes. abi.decode解码bytes回数据。
而ABI解码有1个函数:abi.decode,用于解码abi.encode的数据
abi.encode encodes data into bytes. abi.decode decodes bytes back into data.
abi.decode用于解码abi.encode生成的二进制编码,将它还原成原本的参数。
我们将abi.encode的二进制编码输入给decode,将解码出原来的参数。
function decode(bytes memory data) public pure returns(uint dx, address daddr, string memory dname, uint[2] memory darray) {
(dx, daddr, dname, darray) = abi.decode(data, (uint, address, string, uint[2]));
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
contract AbiDecode {
struct MyStruct {
string name;
uint[2] nums;
}
function encode(
uint x,
address addr,
uint[] calldata arr,
MyStruct calldata myStruct
) external pure returns (bytes memory) {
return abi.encode(x, addr, arr, myStruct);
}
function decode(
bytes calldata data
)
external
pure
returns (uint x, address addr, uint[] memory arr, MyStruct memory myStruct)
{
// (uint x, address addr, uint[] memory arr, MyStruct myStruct) = ...
(x, addr, arr, myStruct) = abi.decode(data, (uint, address, uint[], MyStruct));
}
}