How are NEP11 Tokens / TokensOf methods supposed to be invoked

[devhawk]

Can someone please share code demonstrating how to invoke a method that returns an Iterator such as NEP11 Tokens or TokensOf

[ProDog]

        private void TokensOf()
        {
            byte[] script;
            using (ScriptBuilder sb = new ScriptBuilder())
            {
                sb.EmitDynamicCall(UInt160.Parse("0x324552a48aaee3be71f6ab3a4edb971c6d5c1ae2"), "tokensOf", UInt160.Parse("0xbed7d6494ceb31c82630de657cbb1e7fc1254469"));
                script = sb.ToArray();
            }

            RpcInvokeResult invokeResult = _rpcClient.InvokeScriptAsync(script, new Signer[] { }).Result;
        }

[devhawk]

How are you supposed to get the results of the iterator out of the RpcInvokeResult?

The JSON returned from invokescript will include up to RpcServerSettings.MaxIteratorResultItems. Here's an example of the JSON returned from tokensOf for a NEP-11 sample I've built:

{
    "script": "DBQAAAAAAAAAAAAAAAAAAAAAAAAAABHAHwwIdG9rZW5zT2YMFJpa9Q5eO0wZ\u002BCiMbClC50kOH5vlQWJ9W1I=",
    "state": "HALT",
    "gasconsumed": "2538240",
    "exception": null,
    "stack": [
        {
            "type": "InteropInterface",
            "iterator": [
                {
                    "type": "ByteString",
                    "value": "MCzYlCuv8ZFJBafDBVfbFAhXs6UN0UTp05b7dVH\u002BJ6k="
                },
                {
                    "type": "ByteString",
                    "value": "PeIWEBz1lPu7Q8\u002BZ5u0/xUr7Lku9EPiLpfpBabZIySM="
                },
                {
                    "type": "ByteString",
                    "value": "nKO\u002BA7byvYwio1pv0GJnKJGdx3lDgF0Y8JZPvpZUflA="
                }
            ],
            "truncated": false
        }
    ]
}

However, Utility.StackItemFromJson doesn't parse the iterator property when it encounters an InteropInterface type:

public static StackItem StackItemFromJson(JObject json)
{
    StackItemType type = json["type"].TryGetEnum<StackItemType>();
    switch (type)
    {
        // other StackItemType case blocks omitted for clarity
        case StackItemType.InteropInterface:
            return new InteropInterface(new object()); // See https://github.com/neo-project/neo/blob/master/src/neo/VM/Helper.cs#L194
    }
    return json["value"] is null ? StackItem.Null : json["value"].AsString();
}

[devhawk]

It appears that I have to use RpcClient.RpcSendAsync and parse the resulting JSON manually.

[devhawk]

Also, since the RPC server will only return the first MaxIteratorResultItems items in the JSON, how does one access additional items? For example, if I own 110 tokens, and MaxIteratorResultItems is set to the default of 100, how do I get information about tokens 101 thru 110?

[devhawk]

Note, this issue may be a more specific duplicate of neo-project/neo-modules#629