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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Immutable smart contract

In EOS, smart contracts can be updated by the account owner. This could be a problem for certain applications in finance. For instance, if I want to deploy a token, the transfer function should be non-...
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How check deferred transaction logs on EOS jungle testnet?

As I working on jungle testnet and perform a 1 deferred transaction with some scheduled automatic time. But I failed to see transaction logs on the jungle testnet. Can any please guide me here with ...
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1answer
41 views

Can a smart contract perform actions on a scheduled delay indefinitely?

I am pretty new to working with EOS, so please excuse my ignorance and improper terminology. I am trying to repeatedly excecute a given action on a set time delay. For example, trying to submit a ...
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how can i pass array of integers to smartcontract action using SwiftSDK

I have following action in my smartcontract: ACTION uploadfile1 (name creator, vector<uint8_t> content, string filename) I'm trying to push action from my Swift application using following code:...
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1answer
41 views

EOSIO failed when using Smart Contract Action with updated Parameters

I deploy a Smart Contract first time and the action becomes usable as it's supposed to be, but when Action's parameters is updated with a new one between existing p1 and p2 old parameters (result: p1, ...
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1answer
8 views

Caller of action detail in code

I need to check Account of caller action ,as in ethereum we have a concept of msg.sender to get the caller eth_address, similar is there a way to get caller of action details in EOS.
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1answer
67 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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2answers
362 views

What is the difference between transaction.send and action.send?

I found that there are two types of transfer I can use in an EOS contract, but I don't know what is the difference between them. 1st type 2nd type
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1answer
62 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
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How to read tables from other smart contracts?

I tried to look for inside the EOS repository and contracts examples but I could not find anything like this. I want to know how can I read another contract table. So, as an example: my contract ...
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2answers
67 views

Can I use Timers?

I know that there's no timer in other smart contracts and even this is not possible in regular blockchains. But, EOS uses C++, and they already did lots stuffs which makes smart contracts more usable. ...
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55 views

How to Define and use Array of Strings in Struct?

My Sample Struct and its method // Department Table struct [[eosio::table]] department_info { uint32_t ID; std::string deptname; std::string deptcode; std::...
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Does anybody have a complete code example of changing the e.g. active key of a contract account from within that contract?

I want a contract to set its active permission to a hardcoded key (an "EOSxxxx" string) from within the contract code, but I can't find an actual complete code example that works. This ...
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1answer
61 views

How to access data inside multi-index table when using 2D vector / 2D array?

What is going on? :D I write data, but cannot find it after I write it. The following code successfully emplaces the row into the multi-index table: See specifically the vector<vector <...
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152 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
71 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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1answer
100 views

read datastream of length 29 over by -4

enum house_status: uint64_t { NEW = 10, FULL = 20, ONGOING = 30, OVER = 40 }; struct [[eosio::table, eosio::contract("game")]] house{ uint64_t id; uint64_t owner_player_id; ...
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1answer
76 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 = ...
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1answer
28 views

Nested depth exceeded

kipping set abi because the new abi is the same as the existing abi Publishing contract... Error 3070002: Runtime Error Processing WASM Error Details: Nested depth exceeded pending console output: ...
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2answers
42 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 ...
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140 views

How to get a contract to accept tokens as payment

I keep getting the following error: transaction declares authority '{"actor":"test2","permission":"active"}', but does not have signatures for it under a provided delay of 0 ms, provided permissions [...
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2answers
64 views

Is there a way to prevent me spending tokens until an action is called?

I am creating a smart contract but came to a halt when writing the code. Is there a way, in a smart contract, to prevent me from spending tokens transferred to me by another user through the smart ...
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68 views

Is there a way to issue tokens infinitely?

I want to design a system where token supply can grow infinitely. Is it possible not to fix total supply at the token creation moment?
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1answer
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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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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2answers
152 views

Set source file properties called with incorrect number of arguments

When attempting to compile a new contract, I am getting this error. I'm using eosio version 2.1 for this. CMake Error at /home/michael/eosio.cdt/build/lib/cmake/eosio.cdt/EosioCDTMacros.cmake:18 (...
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how to make sure the tx to be included in block

as subject, any way to make sure the tx to be included in block, what i think of is, if the tx meet the condition, then notify the contract to execute the specified action, otherwise notify an account ...
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1answer
141 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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111 views

What is the ledger in EOS?

When I create a smart contract, e.g: game. what does the ledger store? (EOS tokens, or heathy points, level of user). If the ledger stores heathy points, level, so how I can push it into block (...
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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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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
119 views

Authorization flow in dapps

How authorization works in EOS dapps? I mean in application layer. For example in a trello like application how we manage to just the participants in the project are able to see the tasks?
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2answers
707 views

How to send EOS based tokens from one account to another?

While playing a game on Dapp if we want the user to donate some tokens in order to join the game, how can we accomplish it in the smart contract?
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1answer
135 views

Smart contract error while calling recover_key

Specs I am using the function recover_key from the library crypto.h at the following link: https://github.com/EOSIO/eos/blob/master/contracts/eosiolib/crypto.h Code int compressed_size = ...
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1answer
59 views

How can I change quantity in transfer

Good Day!! I want to change add_balance in transfer How can change quantity value in add_balance? Ex) invalid operands to binary expression ('eosio::asset' and 'int') add_balance( to, quantity - 100 , ...
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1answer
168 views

WAX - Signature error : "Message: transaction declares authority, but does not have signatures for it."

I'm trying to send a transaction from my react frontend to local chain, I have signed in wax cloud wallet and made a transaction. But at last I met this signature error. "Message: transaction ...
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1answer
134 views

Is it possible to deploy contract via curl?

Using command line i am deploying smart contract "eosio.token". cleos -u http://127.0.0.1:8888 set contract eosio.token ./eosio.token -p eosio.token Is it possible to deploy smart contract using ...
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1answer
250 views

Deploy Contract from browser using eosjs

so I would like to deploy an EOS contract using eosjs. I encountered several problems (especially with converting the .abi and .wasm files). All the examples either use node (so fs is available) or an ...
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1answer
20 views

cdt1.8.1 compile issue

error encountered when compile the contracts with cdt 1.8.1, any idea? /usr/local/Cellar/eosio.cdt/1.8.1/opt/eosio.cdt/bin/../include/boost/pfr/detail/core17_generated.hpp:38:9: error: type 'swaps_row'...
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1answer
551 views

How to solve !action_type.empty(): Unknown action hi in contract hello?

I am following this doc: https://developers.eos.io/eosio-home/docs/your-first-contract. This is the hello.cpp contract code which is successfully deployed: #include <eosiolib/eosio.hpp> #...
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2answers
291 views

A possible alternative sign in/login process instead of firebase auth / amazon cognito using an eos contract?

I had the the idea of a secure alternative login process using an EOS smart contract instead of firebase or Amazon cognito. I would like to know if something like this feasible? My idea is somewhat ...
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1answer
188 views

Token transfer missing_auth_exception

{ "code":500,"message":"Internal Service Error", "error":{"code":3090004,"name":"missing_auth_exception", "what":"Missing required authority", "details":[{"message":"missing authority of thomsoimj21","...
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1answer
440 views

How to use recover function in crypto.hpp to verify signature and public key

I want to sign some data in client using eosjs-ecc.sign() and result is a string like "SIG_K1_KcTmv..." I want to use the recover_key(const checksum256* digest, const char* sig, size_t siglen, char*...
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1answer
276 views

Transfer tokens inside a smart contract from an account to another account

I need to write a simple function that would send tokens using a different account action. Exactly the same situation as in these questions: one and two But I have to use not eosio.token contract but ...
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2answers
147 views

How do tokens that pay dividends work?

If a token is created as a standard eosio.token, what are some approaches for paying out dividends to token holders?
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1answer
164 views

Execute get_supply function within contract

I want to execute get_supply from currency.hpp. Here is the definition: asset get_supply( symbol_name symbol )const { accounts t( _contract, symbol ); return t.get(symbol).balance; ...
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1answer
76 views

Is there a way to mark accounts like give an account a property value?

Let's say I'm making a game character and each eos account is a unique character. Is there a way to mark an account with different properties like strength, speed, durability, etc....
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1answer
108 views

How to setup action access control?

Let's say contract-A has a couple of actions defined. If access to one of the contract-A's action, say action1(), needs to be controlled on account basis, how to do it? For example, only few ...
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1answer
32 views

Is it allowed to look up tables of another contract?

Imagine if I have an account with contract. Is it allowed for me to look up tables of some another contract from my contract action?
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1answer
48 views

Smart contract compiling loop

When I try to compile the contract the process creates an infinite loop. Here is my code, please help! kjnjrwsyxszg.cpp #include "kjnjrwsyxszg.hpp" void kjnjrwsyxszg::create(const name owner,...

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