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.
618
questions
0
votes
2
answers
95
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'...
- 235
0
votes
1
answer
49
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, ...
- 515
0
votes
1
answer
275
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?
- 1,066
0
votes
1
answer
89
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?
- 1
2
votes
1
answer
47
views
Amount deposited not being recorded in contract [closed]
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....
- 291
0
votes
3
answers
156
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.
0
votes
1
answer
42
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;
...
- 515
0
votes
1
answer
41
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(...
0
votes
1
answer
155
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 ...
0
votes
1
answer
27
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 ...
- 3
0
votes
0
answers
44
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 {
...
- 515
0
votes
1
answer
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 &...
- 515
0
votes
1
answer
145
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:...
0
votes
1
answer
560
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;
...
0
votes
2
answers
144
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 ...
- 105
0
votes
2
answers
366
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
'...
0
votes
1
answer
41
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 ...
- 105
0
votes
1
answer
236
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
{
...
- 258
0
votes
1
answer
160
views
How to remove deployed smart contract?
I want to sorta "undeploy" smart contract as it was not deployed ever.
If it is possible, I hope it will cleanup account's RAM.
And I'm not talking about freezing .
- 258
1
vote
0
answers
25
views
How to retrieve tx object within contract
I'm trying to retrieve tx within contract, but I only can find tx_hash using read_transaction. Anybody can help me?
2
votes
1
answer
138
views
Execution order of actions
I want to implement "continious minting" which means first I should call issue, and only then transfer.
My contract has a functionality of eosio.token . I call create to create my token with ...
- 258
1
vote
0
answers
26
views
How to view Macro extended code?
I use this command is ok:
eosio-cpp hello.cpp -o hello.wasm
But I want to view Macro extended code by option -E - Only run the preprocessor,
I use this command:
eosio-cpp hello.cpp -E
And get ...
- 11
1
vote
1
answer
180
views
Wondering how to fix eosio.token transfer error in contract
I am developing an EOS dapp game
When the user acts on the contract after Scatter authentication, the logic is to deposit the bet amount from the user to the contract account.
But I get an eosio....
- 11
0
votes
0
answers
47
views
Catch errors when calling deposit
When I send EOS in a contract to several recipients, it can happen that this fails, e.g. because a recipient has a contract running like that:
Example contract of one recipient:
[[eosio::on_notify("...
- 1
1
vote
3
answers
223
views
How does Jungle testnet create new account?
I have created new account in https://monitor.jungletestnet.io .
I have a copy of the log
# eosio <= eosio::newaccount {"creator":"junglefaucet","name":"myaccount","owner":{"threshold":1,"keys":[{...
- 258
0
votes
1
answer
167
views
how to connect eos smart contact with flutter app
flutter has this package name Eosdart,Im able to get the detail from blockchain with app like account detail,but im unable to push the transaction.
I want to push a transaction which carry argument ...
3
votes
1
answer
375
views
Sending transaction with Scatter from a single-page application
Request for help:
I need a simple example of sending transaction (pushing a contract action test) by Scatter written in plain JS for a single-page browser scrip without any requirjs , vue , angularjs ...
- 31
0
votes
0
answers
59
views
How can i Improve my code (Transaction took too long)
I have Enough CPU and NET
i have staked 13 EOS for each and still unable to run the code.
Please suggest if i can improve anything.
IS there any problem of table index
Got this from developer.io
if ...
0
votes
1
answer
64
views
COMPILATION ERROR error: static_assert failed "Something went wrong. Please report this issue to the github
Getting an error when the code reaches this particular function.
Is there something obvious I am missing here?
Kindly Note this is Deferred transaction
Please ask if anything else is required from ...
0
votes
1
answer
143
views
multi_index table get const_iterator at a specific position
is there a better way than a loop to get the value/const_iterator at a specific position in multi_index table?
current:
auto idx = _table.get_index<"name"_n>();
const_iterator b;
int count = ...
- 99
0
votes
1
answer
201
views
COMPILATION ERROR error: non-type template argument is not a constant expression
what is causing this error while im compiling ?
struct [[eosio::table]] requestForLoan{
uint64_t req_id;
name borr_name;
uint64_t borr_id;
name uwr_name;
uint64_t uwr_id;...
0
votes
0
answers
417
views
Error message assertion failure with message: "read"
I made my own smart contract. and tried to erase my table. But it didn't.
I will attach the following error
{
"code": 500,
"message": "Internal Service Error",
"error": {
"code": 3050003,
...
- 88
0
votes
1
answer
76
views
Is there RPC API endpoint to request how much resources account uses?
Is there any way to track or get information about current user account resources consumption using RPC API? I.e. how many operations can be executed with the current tokens or how much RAM or CPU is ...
- 135
2
votes
2
answers
806
views
How to free up used memory
I have this picture for my account
memory:
quota: 220.4 KiB used: 207.5 KiB
I want to free the memory and sellram. Is it possible, and if yes, how to do that?
- 258
0
votes
1
answer
184
views
Deferred transaction on EOS [duplicate]
Is it 100% sure that deferred transaction will run on what delay is defined?
Is there any possibility that deferred transaction failed to run on defined day? If it fails what is the alternative?
...
0
votes
1
answer
393
views
Can we store date on eosio table?
Is there any direct datatype in eosio to store date? and if not then how can we store dates in eosio table?
void mainloan::paymentConfirm(uint64_t pay_id,uint64_t pay_date,double pay_amunt,name from ...
0
votes
1
answer
524
views
How to upgrade a multi_index table in a smart contract
I have initially the following multi_index table:
struct [[eosio::table]] plastict
{
uint64_t id;
uint64_t type;
uint64_t primary_key() const { return id; }
};
typedef eosio::multi_index&...
- 11
0
votes
2
answers
667
views
How to loop a multi_index table in a smart contract
I have very simple table items with the following structure:
struct [[eosio::table]] item
{
uint64_t id;
uint64_t state;
string description;
uint64_t primary_key() ...
- 11
1
vote
1
answer
109
views
what is get(),find(),end(),raw() keywords in eos smart contract?
how and when to useall these keywords and what they actually means?
and what is the difference in these 2 statement given below
auto itr = loan_table.get(loan_id);
auto itr1 = loan_table.find(...
0
votes
0
answers
97
views
When deploying a contract what is important (overall contract/wasm size or amount of functions etc) to not get transaction took too long
when I try to deploy the system.contract I sometimes get transaction took too long with the new eosio version 1.8.1.
Now I would like to know on which part of a contract do I need to pay attention ...
- 99
1
vote
1
answer
96
views
EOSIO's BP Benchmark
Today, I am researching how I can draw a diagram for BPs Benchmark, and luckily I found information about Ahola.
But I cannot figure it out, how I can get value from Ahola's smart contract to draw a ...
- 15
0
votes
1
answer
204
views
how to compile eosio.system contracts?
I cloned the eosio.contracts folder from github and made some changes in some of the contracts. Now I would like to compile them and test them, but when I try to compile them with eosio.cdt I get ...
- 99
0
votes
2
answers
54
views
Zero amount transfer?
I just want to use EOSIO as a DB of some events by sending transactions when other events fire. Is it possible to send ZERO amount transfers? The events are millions a day, and I don't know how to ...
- 258
0
votes
0
answers
81
views
env.is_feature_activated unresolvable while setting up eosio.system contract
I am following BIOS Boot Sequence. I want to set up my own private EOS network that's why I am setting up the EOSIO network. at step 1.12 I am not able to set the eosio.system contract it will give me ...
0
votes
1
answer
60
views
I'd like to swap my eos token using eosio.token with EOS coin
I am a DAPP Developer in Korea.
I have publish my own token using eosio.token recently.
I love to study eos main network system.
Now I am trying to learn how swap my token with EOS.
So that I was ...
- 3
1
vote
1
answer
62
views
What are the patterns and anti-patterns when programming for EOS?
When programming smart contracts or writing eosjs code, there are certain pitfalls that you might fall into if you are not careful. What are some of the patterns and anti-patterns to be aware of that ...
- 4,744
1
vote
2
answers
308
views
Transferring EOS within Smart Contract
I'm building a Smart Contract that transfers EOS from my contract account to end user accounts.
I can not seem to find up to date and correct syntax for transferring EOS using eosio.token from within ...
- 11
1
vote
0
answers
21
views
How does smart contract development differ between each of the EOS.IO side/sister chains?
Most tutorials that exist for smart contract development are directed at the EOS Mainnet chain. But there are several sister and side chains available, and the number is growing all the time. How does ...
- 4,744
1
vote
2
answers
54
views
How to tell a certain contract in indeed used in a dApp?
The dapp review sites often list the contract names a dapp is using. I see that this is added by whoever has added that dApp into the review site.
But is there a verifiable way (through an explorer ...
- 121
1
vote
1
answer
291
views
How can I get the balance of my account with smart contracts in cdt 1.6
All previous answers before used some function called get_balance, but there is none listed like that in the api https://eosio.github.io/eosio.cdt/1.6.0/functions.html.
- 113