Error: Member "value" not found or not visible after argument-dependent lookup in function

Question

Using the online Solidity compiler I get this error:

browser/TokenSales.sol:18:10: Error: Member "value" not found or not visible after argument-dependent lookup in function (address) external returns (bool) - did you forget the "payable" modifier?
    if (!TokenSalesInterface(tokenSales).proxyPurchase.value(msg.value).gas(106000)(payout)) throw;
         ^-------------------------------------------------^

For this code:

contract ProxyPayment {

  address payout;
  address tokenSales; 
  address owner;

  function ProxyPayment(address _payout, address _tokenSales) {
    payout = _payout;
    tokenSales = _tokenSales;
    owner = _payout;
  }

  function () {
    if (!TokenSalesInterface(tokenSales).proxyPurchase.value(msg.value).gas(106000)(payout)) throw;
  }

}

This is my repo.

How can I fix this issue?

Answer 1

You can fix it by whether downgrading the used compiler to a version prior to 0.4.0 or using the following call :

 if (!TokenSalesInterface(tokenSales).call.gas(106000).value(msg.value)(bytes4(sha3("proxyPurchase(address)")),payout)) {
             throw;
         }

if you are using a recent compiler don't forget to use payable in the functions which receive ethers. related post : How to specify gas/value when making a call using abstract contracts?

Answer 2

You are trying to access msg.value in

function () {
  if (!TokenSalesInterface(tokenSales).proxyPurchase.value(msg.value).gas(106000)(payout)) throw;
}

but the fallback function is not defined as payable, so it cannot take ether.

Also the function

function proxyPurchase(address _user) returns (bool success) {
  return purchase(_user, msg.value);
}

Takes address as an input and returns boolean value while you are passing uint value as msg.value.

Answer 3

You could try something like this:

  function () payable { 
    if (!TokenSalesInterface(tokenSales).proxyPurchase(msg.sender)) throw;
  }

The function proxyPurchase requires one argument:

  function proxyPurchase(address _user) returns (bool success) {
    return purchase(_user, msg.value);
  }