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tests...22Call.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
import "tests/OtherContract.sol";

contract Call {
    //定义response事件，输出call调用的success和data
    event Response(bool success, bytes data);

    //定义callSetX函数来调用目标合约的setX()，转入msg.value数额的ETH，并释放Response事件输出success和data
    function callSetx(address payable _addr, uint256 x) public payable {
        (bool success, bytes memory data) = _addr.call{value: msg.value}(
            abi.encodeWithSignature("setX(unit256)", x)
        );
        emit Response(success, data); //释放事件
    }

    //调用getX()函数，它将返回目标合约_x的值，类型为uint256。我们可以利用abi.decode来解码call的返回值data，并读出数值。
    function callGetX(address _addr) external returns (uint256) {
        // call getX()
        (bool success, bytes memory data) = _addr.call(
            abi.encodeWithSignature("getX()")
        );

        emit Response(success, data); //释放事件
        return abi.decode(data, (uint256));
    }
    //如果我们给call输入的函数不存在于目标合约，那么目标合约的fallback函数会被触发。
    function callNonExist(address _addr) external{
    // call 不存在的函数
    (bool success, bytes memory data) = _addr.call(
        abi.encodeWithSignature("foo(uint256)")
    );

    emit Response(success, data); //释放事件
}
}