I want develop a contract that can be interacted from outside with a considerably complex argument(like a string of struct), but the Ethereum seems that the contracts can only be communicated with functions using simple arguments like type uint, string, bytes, how can I manage it? I mean if I want to develop a function with arguments of a string of struct of unspecified length, how can I manage it?
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1 Answer
Currently Solidity does not allow you to pass complex types as function arguments into or out of a smart contract. So currently you neither do
function setMyStruct (myStruct ms) {
...
}
nor can you do
function getMyStruct constant returns (myStruct ms) {
...
}
On work-around is to pass the elements of the struct one by one into the setter and return them one by one from the getter as in
contract testStruct {
struct myStr {
int a;
string b;
}
myStr storedStr;
function setMyStr(int a, string b) {
storedStr.a = a;
storedStr.b = b;
}
function getMyStr() constant returns (int a, string b) {
a = storedStr.a;
b = storedStr.b;
}
}
Check also the following links to follow up on that:
