Return address from a method

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• ameten ✭ Member Posts: 7 ✭

  September 2015

  Actually, the problem is not only with address, but with any non-constant method returning a value.
  
  Callback method function(err, result) returns transaction hash as result. How can I retrieve return value?
  
  I can store the value in storage in non-constant method and retrieve the value calling a constant method, but is there a better way?

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• fivedogit ✭ Member Posts: 21 ✭

  September 2015

  From the Ethereum 101 doc (https://goo.gl/Yp85Nl), you're probably looking for this question and answer:
  
  "Q: Get return value from non-constant method from another contract"
  
  "A: The key point is that the calling contract needs to know about the method it intends to call.
  See https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/45_ping.sol
  and https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/45_pong.sol"
  
  .. and maybe a little...
  
  "Q:Can a contract create another contract?"
  
  "A: Yes. See https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/50_replicator.sol
  Note that contracts of a cyclical nature are currently impossible."
  

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• ameten ✭ Member Posts: 7 ✭

  September 2015

  @fivedogit, your post suggests the same thing as I mentioned in my comment

  ameten said:

  I can store the value in storage in non-constant method and retrieve the value calling a constant method, but is there a better way?

  Given the following comment, we cannot do it with web3/geth.

  //Supposedly, contracts can get non-constant return values from other contracts. (Whereas you can't from web3/geth.)

  
  

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• ameten ✭ Member Posts: 7 ✭

  September 2015

  @tjade273, I thought that events are used for logging purposes in Solidity.

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