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I'm developing a dapp on Meteor that uses a contract written in solidity. In the contract there is a struct. Is possible to print the values that are in the struct? How can i do this?

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If you have a single Struct that you want to get the value for, you can (1) simply make it a public variable or (2) create a getter in the contract, something like getStruct below:

struct MyStruct {
  uint a;
  uint b;
  uint c;
}

MyStruct public myStruct = MyStruct(1, 2, 3);

function getStruct()
  constant
  returns (uint a, uint b, uint c)
{
  return (myStruct.a, myStruct.b, myStruct.c);
}

For your DApp, if the Struct is public, you can simply just call that variable in web3, contractInstance.myStruct.call() which returns and array [a,b,c];

Or you can use the getter function (contractInstance.getStruct()) which would return an array [a, b, c].

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  • What is the _address parameter? – Giulio Magnanini Oct 11 '17 at 10:44
  • @GiulioMagnanini I changed the response to just get the single MyStruct values. My previous response assumed you'd have multiple Structs indexed by an address (mapping (address => MyStruct) public myList), so you would retrieve a Struct relating to an input address (_ in _address simply denotes an input, just code styling) by something like myList[_address]. – carlolm Oct 11 '17 at 17:36

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