How to call "payable function" via interface in solidity

Question

I have a function marked as payable in contract A and I want to call it from contract B so that msg.value in contract A can have its desired value and contract A must have balance of sent amount , how it is possible ?

this suggested link s contract level payable handling, I am looking for function level payable handling and via interface — ashwin, Jul 07 '20 at 08:33

score 3 · Accepted Answer · answered Jul 07 '20 at 08:36

This is how you handle amount sending between contracts via interface:

ContractA.sol:

pragma solidity ^0.5.11;
contract A {
    uint256 public lastFundSentToContract = 0;
function updateLastFundSentToContract () public payable {
    lastFundSentToContract = msg.value;
}

function getContractBalance() public view returns(uint256) {
    return address(this).balance;
}

}

ContractB.sol:

pragma solidity ^0.5.11;
contract B {
    A a_contract_instance;
    constructor(address _a_contract_address) public {
        a_contract_instance = A(_a_contract_address);
    }
function callToContractA() public payable {
    a_contract_instance.updateLastFundSentToContract.value(msg.value)();
}

function getContractBalance() public view returns(uint256) {
    return address(this).balance;
}

}
interface A {
    function updateLastFundSentToContract () external payable;
}

How to call "payable function" via interface in solidity

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