Unity ExecuteContractFunction

Moralis General
#1

Hi,

I’m trying (without luck) to interact with a smart contract through Unity with ExecuteContractFunction(), but new to all this and can’t find any up to date examples on how to do it.

Could anyone provide a snippet that explain how to do it?

Thanks in advance!

//Adam

2 Likes
#2

See if this doc helps.
https://docs.moralis.io/moralis-dapp/web3/web3#executefunction

You can check the forum if any community member has posted any read-only functions and try to run it with executefunction.

You can also follow this tutorial.

#3

Thanks, this helps a little bit, but my problem is that I’m not experienced enough to translate from JS to C#.
For instance the ABI parameter expects a string, but is a bunch of json data. How would I format that?

#4

Where are you at with your code?

JSON data is naturally a string so if it’s in a different format it needs to be converted.

#5

Check this git, it has some moralis functions in C#. Hope this helps.

#6

Thanks, I’ve been looking at this git, but the functions they’re using are deprecated. It’s the ExecuteContractFunction method you’re supposed to use from what I understand.
Unfortunatly there are no examples in C# I can find, and translating from JS is above my skill-level.
The below code is where I am now and this only generates this error:

Call to createBasicProton failed due to: Object reference not set to an instance of an object
UnityEngine.Debug:Log (object)

Any pointers would be super appriciated!

    const string ABI = @"
        [ 
            { 
                ""inputs"": [
                     {
                         ""internalType"": ""address"",
                         ""name"": ""creator"",
                         ""type"": ""address""
                     },
                     {
                         ""internalType"": ""address"",
                         ""name"": ""receiver"",
                         ""type"": ""address""
                     },
                     {
                         ""internalType"": ""string"",
                         ""name"": ""tokenMetaUri"",
                         ""type"": ""string""
                     }
                ],
                ""name"": ""createBasicProton"",
                ""outputs"": [
                    {
                         ""internalType"": ""uint256"",
                         ""name"": ""newTokenId"",
                         ""type"": ""uint256""
                    }
                ],
                ""stateMutability"": ""nonpayable"",
                ""type"": ""function""
            }
        ]";

    public async void MintBasicProton()
    {

        MoralisUser user = await MoralisInterface.GetUserAsync();

        string addr = user.authData["moralisEth"]["id"].ToString();

        string recieverAddress = addr;
        string creatorAddress = addr;
        string contractAddress = "0xe2a9b15E283456894246499Fb912CCe717f83319";
        string metaURI = @"https://firebasestorage.googleapis.com/XXXXXXXXXX";

        object[] pars = { creatorAddress, recieverAddress, metaURI };
        HexBigInteger val = new HexBigInteger("0x0");
        HexBigInteger gas = new HexBigInteger("0x0");
        HexBigInteger price = new HexBigInteger("0x0");
        try
        {
            string resp = await MoralisInterface.ExecuteContractFunction(contractAddress, ABI, "createBasicProton", pars, val, gas, price);
            Debug.Log($"$Send Transaction respo: {resp}");
        }
        catch (Exception exp)
        {
            Debug.Log($"Send transaction failed: {exp.Message}");
        }
    }
#7

Can you try converting this JSON in to a string?
https://jsontostring.com/

#8

This is helpful, thank you. I have a further nuance where the smart contract function is only callable by the owner (onlyAdmin) how is that done within the SDK for unity? I have viewed the vids and have not been able to find an example of this.

#9

You will have to sign the transaction using the owner wallet address. This tutorial covers contract interactions with the new SDK.