TypeError: Member "encodeCall" not found or not visible after argument-dependent lookup in abi

Question

I am trying to test abi.encodeCall on Remix. I have this function

function getTestData() external pure returns (bytes memory){ // passing empty args () return abi.encodeCall(TargetContract.send,()); }

this is the version

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.0 <0.9.0;

Answer 1

This is a bug (actually lack of feature) that has been fixed since Solidity 0.8.12: Release note: "General: Support ContractName.functionName for abi.encodeCall, in addition to external function pointers.". The fix is to change your version pragma like below.

pragma solidity ^0.8.12;
contract TargetContract{
    function send() external {}
}
contract Test{
    function getTestData() external pure returns (bytes memory){
        return abi.encodeCall(TargetContract.send,()); 
        // another solution: return abi.encodeWithSelector(TargetContract.send.selector, (""));
    }
}

You can also use the alternative in the comment (using abi.encodeWithSelector), it can also work for solc version before 0.8.12.