Questions tagged [smart-contract]

Anything related to decentralized application (dApp) development, concepts, and possibilities with smart contracts, or technical questions for the development of smart contracts.

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EOSlime TypeError: Contract.actionname is not a function

This is my test file: const assert = require('assert'); const TOKEN_WASM_PATH = './contracts/group/group.wasm'; const TOKEN_ABI_PATH = './contracts/group/group.abi'; describe("EOSIO Group", ...
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1answer
32 views

eoslime test not saving data in table

This is my first experience with eoslime as I want to do unit testing for smart contracts. Not much experienced with nodejs .I am following eoslime documentation: https://docs.eoslime.limechain.tech/...
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2answers
81 views

how to define a vector with fixed size?

I want to define a vector of strings with a fixed size 3 in the multi-index table of smart contract. I search and tried different ways which I found for CPP vector like: std::vector<string> abc(...
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31 views

Wrong table name in scope response

My contract has two tables mcat and mcatmig. Problem: scope request return wrong table name mcat........1 instead of mcatmig: % cleos get scope teresacode { "rows": [{ "code": "teresacode", "...
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How to generate unique string id from given array of strings in smart contract?

I am writing an EOS smart contract in which need to write the action to generate a unique id from the given array. Array consisting of n number of string elements (UUID). Suppose I pass 10 strings to ...
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46 views

How to set vector type field as a secondary index in smart contract?

I want to set a group vector as a secondary index in the user smart contract. group is the list of groups. Following is the changes I am doing: struct [[eosio::table]] usertable { ...
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175 views

Multiple smart contracts with single account

I have three smart contracts (A, B, C) and one account (X). As the requirement is I just need only one authority (administrator) who is going to manage all these smart contracts data. So I deployed ...
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1answer
48 views

How to check authorization for a particular account in EOS smart contract?

I want to write an EOS smart contract to manage users data. I need that only some admin account will able to add, update and delete users and the particular user can only update data. Can I check ...
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37 views

Complex smart contract for rule based auction in multiple currencies

The imagined application allows users to participate in an auction and make bids in cryptocurrencies. There are several behavioral rules that control the execution of the auction and determine the ...
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1answer
27 views

Take output from GetActions and send to database using eossharp

I am using eos-sharp to get data from the eos smart contract. I am trying to get actions data by using: var resultaction = await eos.GetActions("dqzmember", 0, 30); I need information from ...
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52 views

how to save data in mongodb from eos smart contract?

I am getting the actions log data using an action constructor in a smart contract. I need to save this data in MongoDB from the smart contract. How can I do this? I didn't get exactly my required ...
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22 views

How to access and manipulate tables when using native unit tests?

I am trying to write unit tests for functions in a smart contract that require access to tables within the smart contract. I tried to set this up using the hello_test.cpp code as a base and when I get ...
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58 views

How do I record LOG in eosio smart contract?

I deployed and tested eosio smart contract. I want to record the logs of a smart contract using the web API. How can I do this? I searched but didn't get any satisfying answer. I tried to get logs by ...
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28 views

Question cost while using token contract

I am sorry to bother you, I am a little confused about the cost while using a token contract: the contract provider will pay all the utilities if a user using the contract including the CPU, NET and ...
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1answer
64 views

cleos data getting inserted and deleted but table shows empty record

I have written one smart contract for insert, update and delete data. The smart contract is compiled and deployed to the two accounts. I insert data using calling the action upsert, this transaction ...
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40 views

make inline transfer contract and using it on jungle testnet

hello everyone i am faceing a problem on jungle testnet i am trying to make a inline transfer but i got this error after i work with the api_endpoint the code is #include <eosio/eosio.hpp> #...
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1answer
55 views

Where is the smart contract is stored

I would like to know where the smart contract is stored after the copilation and deployment. Thanks
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1answer
62 views

Trying to execute a smartcontract action using a multisig account, but it shows executed even when the transc fails due to smartcontract constraints

I'm proposing a transaction to execute an action of some smartcontract, the transaction is showing executed irrespective of failure or success of the smartcontract action(say transferFunds), this is ...
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1answer
26 views

Eos-sharp jungle Error 3090003 when trying to call external smart contract

I’m trying to achieve something quite simple. I try to call eosio.token transfer from one of my smartContract (lomtaxjungle dopurchase), but after severals days i still don’t manage to do it. From ...
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0answers
21 views

Make a trade contract between two tokens like (EOS) & (SYS)

hello everyone i made a small contract that trade between two tokens using eosio.token but if i wasn't work on local test how can i have access to EOS tokens or SYS in the main net and how can i do ...
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1answer
34 views

Declare custom structs

I am trying to create a custom struct called Student in a contract. Where do I declare or define the struct? I tried to define it in the abi file, but the file was over written when I compile the ...
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1answer
52 views

Check public keys on contract level

Is it meanwhile possible to check the public key of an account name on contract level? (Not with Cleos) Example: The contract contains some public keys (not the account names). If a user performs a ...
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1answer
142 views

What is the difference between std::string and eosio::string?

Why should I use eosio::string over std::string? What are the use cases where it would make a difference?
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1answer
68 views

I have doubts about intercontract communication

I have read that: In order to call an inline action, that is to call an action of contract A from contract B, there is a need to set some special permission. In this case, the Ram payer for the ...
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1answer
61 views

Contract transaction cannot be found after i get result of pushSignedTransaction

I've send a contract trans on mainnet use eosjs@20, and i've tried for 4 times, every time i get a trans result, but all of them seemed been drop, i cannot find them on explorer or on chain, can any ...
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1answer
77 views

Strange checksum256->uint64_t casting

I'm trying to cast checksum256 to uint64_t Here is conversion code: uint64_t checksum_to_uint64(const eosio::checksum256 & digest) { auto checksum_bytes = digest.extract_as_byte_array()....
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1answer
38 views

Profiling EOS.IO smart contract code

What's the best way for profiling the code of an EOS.IO smart contract? I'd like to know what percentage of the CPU time is spent on executing each function\line (including multi index table function ...
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1answer
61 views

Trouble using EOSIO built in crypto library (can't resolve headers)

I ran eosio-init on the newest CDT (1.7) and made a -bare project. newtest.cpp #include "newtest.hpp" ACTION newtest::hi( name nm ) { /* fill in action body */ print_f("Name : %\n",nm); } ...
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1answer
65 views

Is there way to retrieve auto incremented primary key after submission of transaction?

I'm working on sample dApp application to understand the working of multi_index table in EOS smart contract. I have defined two multi_index table. The primary key of table1 is auto incremented using "...
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1answer
59 views

How to check in my contract the incomming amount?

I would like to check in my contract the incomming amount. I tried these: void mycontract(name from, name to, eosio::asset quantity, std::string memo){ check( quantity.amount > 50, "must ...
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2answers
142 views

Use UUID as primary key in multi_index

How can I use a uuid as the primary. struct [[eosio::table]] blackboxdata { name user; std::string uuid; std::string hash; std::string sqlrequest; uint64_t ...
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1answer
70 views

Is it possible to see the RAM delta of a multi_index table operation, or see who is currently paying for a row in a table

My question is in the context of smart contract development, so I'm looking for solutions that work within smart contracts: 1st: Is is possible to see the RAM delta of either an individual ...
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2answers
46 views

I have some doubts about open function of eosio.token smartcontract

async function openAccount (tokenCreator ) { try{ const result = await api.transact({ actions: [{ account: tokenCreator, //'eosio.token', name: 'open', //'transfer'...
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1answer
34 views

on_notify fails to compile

I'm following the guidance at https://developers.eos.io/eosio-home/docs/notification-handlers where it states I can decorate a method with: [[eosio::on_notify("eosio.token::transfer”)]] however, ...
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132 views

How to parse json string in contract?

My contract want to receive transfer with memo in json format, is there any libraries supporting the json parse?
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1answer
61 views

I would like to make listener contract

I would like to make a contract, wich listens to the incoming transfers. How do I make a listener contract, wich listens to incoming transfers on the account?
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1answer
38 views

Amount deposited not being recorded in contract

I'm learning to make my own contract and I'm having a hard time getting LNX that is transferred to the contract to be recorded ad a balance. #include <eosio/eosio.hpp> #include <eosio/asset....
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2answers
97 views

How to pay for user resources cost for payable action?

I have a smart contract which has a payable action defined. I want to cover the cost of transfering token to my contract, what's the best way to do this? Thanks.
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1answer
33 views

Static values get mangled

if you run the following (on eosio v1.8.4): #include <eosio/eosio.hpp> #include <eosio/asset.hpp> namespace eosio { class UTL { public: static name code; ...
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1answer
33 views

Function not giving expected output Eos smart contract

My contract .Cpp part void mainloan::adduwr(name acc_name, double interest, uint64_t loan_amount ) { print("Adding underwriter", acc_name); // require_auth( _self ); uwr_table.emplace(get_self(...
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1answer
105 views

Convert String to double (flaot32/float64) in EOSIO [duplicate]

serialize support for float types is not added in flutter and thats why i have to come to this way,so if anyone have any working example for this,ill be really thankful for that. I have tried this ...
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1answer
23 views

How min_activated_stake and total_activated_stake is calculated?

I have a query, in the producer_pay contract, i don't understand how min_activated_stake is calculated here. Also how total_activated_stake is calculated, I've seen that default it's value is defined ...
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0answers
43 views

Code abstraction

I need a little guidance. I've been structuring my code like this: #include <eosio/eosio.hpp> class [[eosio::contract("table")]] Square { private: struct [[eosio::table]] square { ...
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1answer
2k views

call to implicitly-deleted copy constructor

I'm unable to compile a small test contract and am hoping for guidance. I have a class called Account, in the following 2 files: // --- account.hpp #pragma once #include <string> #include &...
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1answer
68 views

What should I do to specify an optional action parameter for cleos?

I wrote an action that has an optional parameter, as something like: [[eosio::action]] void foo(..., const std::optional<name>& recipient); Then in the generated .abi, it is represented as:...
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1answer
332 views

How can we retrieve table data with secondary Index in EOS table

this is my table struct [[eosio::table]] payment_made { uint64_t pay_id; uint64_t loan_id; uint64_t pay_amunt; time_point_sec pay_date_req; time_point_sec pay_date_approve; ...
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2answers
90 views

SELECT value from "column" for which row is retrieved

Problem Say I have a table with the following structure. int value | asset tokenType 4 | 0 bitcoin 7 | 0 altcoin. Now I also have this function where I pass in an asset and i want to ...
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2answers
216 views

how do i use current_time_point() to store date in eos table

I have tried This way and its not getting store,infact its giving me error,please sugguest if im making any mistake. error: use of undeclared identifier 'current_time_point'; did you mean '...
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1answer
28 views

Return token to owner after initiating a transfer to my contract

Good Day, I am working on a contract where for example, If I send 2 ETH to a contract, ( 1 ETH = 2 Cryptokitty tokens ) then that contract is supposed to return me 4 Cryptokitty tokens. What I Have ...
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1answer
129 views

Store enum value in table

I have a simple enum (or enum class, neither one is working ) enum vote_option { upvote = 0, downvote and a table which will store a value of that enum type. struct [[eosio::table]] poll { ...

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