Get value by calling a function from External Smart contract

Question

There are 2 smart contract

contract A {
function abc(string _a) public returns (address) {
    return new B(_a);
 }
}
contract B {
  function xyz(string _a) {
  A a = A(contact address); // interface
  a.abc(_a); 
  }
}

How can i get the value of function abc() when i am making a call from function xyz() of contract B which DOES NOT have a return. Especially in Remix and also through web3.js please guide.

Possible duplicate of how to call a function from deployed contract to another contract — sp4c3, Feb 05 '19 at 09:36
Your code is full of syntax errors. Please provide something that can be compiled and tested, and then explain what it is exactly that you are unable to achieve in it. — goodvibration, Feb 05 '19 at 11:07
@sp4c3 it is slightly opposite of the question i am trying to call FROM a function which DOES NOT have a return TO a function which have a return. So how can i get the return value of the function that i am calling to from the function that does not have a return ? — Taha Dhailey, Feb 05 '19 at 12:59
@DAOdAppDev what are you gonna do to the returned value from A.abc(), you either have to return it, make xyz a return function, Or use it in xyz, for that declare an address variable and store the return of abc in that. — sp4c3, Feb 05 '19 at 13:15
@Post an MVP (minimal viable program), i.e., the minimal piece of code which readers can reproduce your problem with. — goodvibration, Feb 05 '19 at 13:22

score 0 · Accepted Answer · answered Feb 05 '19 at 19:18

0

This should work

contract A {
function abc(string _a) public returns (address) {
    return new B(_a);
 }
}
contract B {
  function xyz(string _a) {
  A a = A(contact address);
  address addr = a.abc(_a);
  //do something with addr; 
  }
}

answered Feb 05 '19 at 19:18

ruby_newbie

304
1
7

how do i get the value of address when there is no return ? – Taha Dhailey Feb 05 '19 at 20:06
If you want the value you have to return it from xyz(), or save it to state to access it with another call. Since that variable is only in memory, it disappears as soon as the call to xyz() completes. – ruby_newbie Feb 05 '19 at 20:37

Get value by calling a function from External Smart contract

1 Answers1