Convert bytes3 to string in Salidity-CodePudding

I need to create function to convert byte3 to string. On my contract, data saved into state variable. now I want to convert content of variable for user. and this is my function :

    function convertByteToString() public view returns(string memory){
        string memory result = string(symbol);
        return result;
    }

but compiler error :

TypeError: Explicit type conversion not allowed from "bytes3" to "string memory".

how to fix error?Thanks in advance

CodePudding user response：

To convert bytes3 to string you must use the abi.encodePacked(bytes3 parameter) and this result you must convert it into a string.

Change your function with this:

function convertByteToString(bytes3 symbol) public view returns(string memory){
  string memory result = string(abi.encodePacked(symbol));
  return result;
}

CodePudding user response：

Only a dynamic-length byte array (Solidity type bytes) can be typecasted to a string, but you're passing a fixed-length byte array (Solidity type bytes3).

Use abi.encode() to convert the bytes3 to bytes.

pragma solidity ^0.8;

contract MyContract {
    bytes3 symbol = 0x455448; // hex-encoded ASCII value of "ETH"

    function convertByteToString() public view returns(string memory){
        string memory result = string(abi.encode(symbol));
        return result;
    }
}