Questions tagged [remix]
Questions about Remix, an online browser compiler for Solidity, formerly called Browser Solidity.
1,400
questions
0
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0answers
5 views
create ERC-20 token from a contract function
I would like to do a function create contract with ERC-20 interface.
But I have a few problems.
If anyone help me I’ll be appreciated.
Here’s the code :
pragma solidity ^0.5.0;
library SafeMath {...
0
votes
1answer
17 views
create contract from function / contract
**Hey guys !
I just try to make a contract for create a contract.
It supposed to be ERC-20 interface so my first contract for this.
But I don’t know how can I do _mint and createContract functions
...
1
vote
1answer
16 views
Assert.equals() weird behavior does not recognize (apparently) equal strings
I'm facing problems related to string comparison using Assert.equals() provided by remix_tests.sol.
I made a toy contract and a related test to show what the problem is:
https://gist.github.com/...
0
votes
0answers
12 views
address.call(abi.encodeWithSignature(“func(<param>)”, _params) doesnot work
contract C1 {
uint public num;
address public sender;
function callSetNum(address c2, uint256 _num) public {
(bool res,) = c2.call(abi.encodeWithSignature("setNum(uint256)",_num));
...
0
votes
1answer
41 views
Why is my calculation broken?
I have a smart contract that holds a token balance, let's call it Token A, users may send this smart contract Token B to receive Token A, they do so by specifying the amount of Token A they would like ...
1
vote
0answers
20 views
Pass hexadecimal literal to contract using web3js
I have a hex literal that I need to pass into a contract using web3, and I'm not sure how to go about formatting it. In solidity, its formatted like so:
hex'...
0
votes
1answer
21 views
Adding the delta to a token transfer
Let's say I have 5 contributors to a pool of a smart contract. They all contributed 1 ether. The smart contract lost 2 ether, and now I want to transfer back the remaining 3 ether to the 5 ...
0
votes
1answer
18 views
Expected identifier but got reserved keyword 'reference' Product public reference; ^-------^
hello guys I am a beginner.
I would like to make a function for create a contract.
I found a example on the internet but gives me an error so I dont know what should I do.
Anyone can help me ?
...
0
votes
2answers
41 views
Error transferring balance. Runs out of gas
This is probably a simple problem to fix, but it is very frustrating.
I am developing in Solidity using Remix 0.5.10.
I have a loan contract that collects funds from borrowers. I now want to ...
0
votes
1answer
19 views
Data Structure Design Choice [on hold]
What data structure design should I use in following scenario:
I want to be able to add soccer players to a registry/list along with their goals count. Now, I should be able to: 1) increase their ...
1
vote
2answers
19 views
Error: gas required exceeds allowance or always failing transaction in Remix using Ropsten network
I am facing this error
, My Contract is quite simple
pragma solidity ^0.5.0;
contract sendEther {
address payable sender;
function showReceiver() public view returns (address payable) {
...
1
vote
1answer
36 views
Remix - another transaction execution failed
I am trying to reproduce the results on Remix with the smart-contract as written here:
https://etherscan.io/address/0xb6ed7644c69416d67b522e20bc294a9a9b405b31#code
(for remix, go to http://remix....
0
votes
3answers
23 views
Why are contacts from Remix editor and explorer different after deploying?
I try to deploy my ERC20 token. My steps are:
1) I created a contact with Remix (by some manual) https://gist.github.com/pistol88/a934da7fcaa93a92f4c4de60df56a0cf
contract TestToken is ERC20Standard ...
1
vote
2answers
34 views
ecrecover() always returns 0x0000000000000000000000000000000000000000
I'm aware of these posts
How do you sign an verify a message in javascript proving you own an Ethereum address?
How does one properly use ecrecover to verify Ethereum signatures?
I'd like to sign a ...
0
votes
1answer
23 views
Initialising Empty Arrays & Structs In Struct-based Storage Graph Structures?
How do I initialise empty arrays and structs in nested structs data structures?
contract NewBook {
struct ReviewerData {
string name,
uint industryXP
// ...
1
vote
1answer
33 views
Updating an instance of an already stored struct?
How can I update/change the values of a stored struct instance?
as an example: Let's say I've already deployed a chapter with the content written in a particular color. Later it turns out that I ...
0
votes
1answer
17 views
Returning an array of inner structs of a struct
How can I return an array of child structs of a parent struct?
as an example: After pushing multiple chapters into the parent struct, how can I retrieve all the child structs as an array (or ...
0
votes
0answers
18 views
Block-chain data retrieval
I'm using a testrpc to test my sensor contract, where many account get to submit data to the block-chain whether using an html client side application or using the smart contract is self.
How can I ...
0
votes
0answers
25 views
solidity-Please help me understand this Smart Contract. Transferring money between adresses in solidity [closed]
Hi guys so I have found this code online of a goods and service type contract, where f.e. a digital asset is created and each time that asset is used by someone, beneficiers involved in the "creation" ...
0
votes
1answer
18 views
Cannot install remix-ide locally
How to install remix-ide npm module? I follow the instructions, but it does not install.
npm install remix-ide -g
...
make: *** [Release/obj.target/scrypt/src/node-boilerplate/scrypt_params_async.o] ...
1
vote
1answer
40 views
No matching declaration found after argument-dependent lookup in remix IDE
I'm getting this error in remix:
"TypeError: No matching declaration found after argument-dependent lookup. require(_spender.call.value(msg.value)(_data));
^-----^ "
function approveAndCall(...
1
vote
2answers
59 views
Remix: 0x0 Transaction mined but execution failed due to construction
I have the following example smart contract, where I cannot deploy using remix into my private network using environment Web3 provider. The error I am getting is Transaction mined but execution failed ...
0
votes
3answers
67 views
How to deploy Library contract separate from the main contract and link it
For deployment I am using remix. When I deploy Hello.sol the compiler typically merges SafeMath.sol as a part of the main contract (Hello.sol) and deploys. This adds up library and main contract's ...
0
votes
0answers
13 views
How does remix decode a contract response without the ABI?
Remix seems to be able to decode the output of a contract to a block of JSON without having the ABI (say I just specify the contract address). How is this achieved - I'm interested in doing something ...
0
votes
2answers
47 views
Calling function with one parameter in Solidity
I am trying to call a function with one parameter
I have used these methods all didn't work: //z=addmul(total); //this.addmul(total);
This is the function created:
function addmul(uint256 a, uint256 ...
2
votes
1answer
30 views
Cannot deploy contract in new Remix layout
I cannot get a contract to deploy in the new layout but when I go back to the old format it works fine. The deployment parameters are as follows:
and here is the error that I get:
However, when I go ...
0
votes
1answer
29 views
Solidity returns “ParserError: Expected primary expression” on my code below, can anyone help?
pragma solidity ^0.5.8;
//Change the contract name to your token name
contract JONJonnywon {
// Name your custom token
string public constant name = "JONNYWON";
// Name your custom token ...
1
vote
1answer
17 views
Using contract to create Child contracts (web3j Java wrapper)
I have a simple Parent contract that creates child contracts and stores their address.
contract Parent {
address[] public registry;
function createChild () public {
address newChild =...
0
votes
1answer
20 views
error in ico token and ico contract
function () public payable {
require(currentStage == Stages.icoStart);
require(msg.value > 0);
require(remainingTokens > 0);
Blockquote fallback typos error
...
1
vote
1answer
29 views
How can I send ether [duplicate]
Hey guys I am a beginer on Solidity. I write a function and try to send ether on remix accounts and check balances this accounts. But I can't connect accounts I think because when I check balance of ...
0
votes
1answer
24 views
CRUD storage pattern Infinite gas error when trying to implement in Remix
I'm trying to implement @robhitchens CRUD storage pattern in solidity, and I'm getting infinate gas costs when I import the library. Not sure where to go from here.
one of them:
Gas requirement of ...
0
votes
2answers
25 views
Solidity code sequence for owner
How can I make my code sequential, meaning I'd like functions to be performed in a certain order.
Can I make a function not run able till another is run.
An example would be great help.
0
votes
2answers
35 views
Unused function parameter. Remove or comment out the variable name to silence this warning
I have a smart contact which have 2 owner address and 3 functions.
my set functions is set a users with msg.sender and my getUser functions is returns name,surname and age and I want to add a admin ...
0
votes
1answer
20 views
Member “name” not found or not visible after argument-dependent lookup in string storage ref
I have code like this and I want to set my name, surname and age in my struct so I want to set them and get them using with my functions
here's my code :
pragma solidity >=0.4.0 <0.7.0;
...
0
votes
3answers
73 views
ParserError: Expected ',' but got identifier
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
struct kullanicilar{
string name;
string surname;
uint age;
}
event infoChanged(
string name,
...
1
vote
1answer
26 views
How to pass struct params in remix ide?
I have this smart contract:
pragma solidity 0.5;
pragma experimental ABIEncoderV2;
contract TestStruct {
struct User {
string name;
uint256 age;
}
mapping (bytes32 =&...
1
vote
0answers
25 views
Gas usage difference between Remix and Ganache/public networks
I'm trying to integrate a contract into a front end with MetaMask and getting different gas amounts depending on the network and compile options I use.
Remix ("Enable Optimization" checked): 90,410
...
1
vote
0answers
18 views
Remix online editor - set tab width
The tab width on remix https://remix.ethereum.org defaults to 4 spaces. I have looked everywhere but I cannot see how to change it to 2 spaces, or 3 or whatever. Is it possible?
nb: don't care what ...
2
votes
1answer
25 views
0
votes
1answer
19 views
Using uint array as an argument in Solidity function
I am trying to compile following on Remix IDE:
pragma solidity ^0.5.1;
contract testArray{
address addr;
function testA(uint _addr, uint[] emp) public{
addr = _addr;
for(uint ...
0
votes
1answer
36 views
Getting Error:VM Exception while processing transaction: revert', 'code': -32000. when deploying to Ganache using Web3.py
I get the following error message:
Getting Error:VM Exception while processing transaction: revert', 'code': -32000
I am connected to Ganache. Here is my code:
import json
from web3 import Web3
...
0
votes
1answer
28 views
My Withdraw function doesnt work
I'm writing my first contract and my withdraw function doesnt work. Eth doesnt move to my _withdrawAddr.
Also can somebody explain why my function getBalanceThis returns 0 instead of amount I send to ...
0
votes
1answer
10 views
Contracts interaction issue
I got stuck in making two contracts interact. The code for two contracts is as follows:
Test1.sol
pragma solidity ^0.5.8;
contract Test1 {
struct Car {
string carCreationDate;
...
0
votes
1answer
31 views
Parity POA Smart Contract Method Always Fails
I have set up a private POA Network according to the tutorial from the parity homepage. I have two nodes running on localhost:8540 and localhost:8541. I have connected MetaMask to my first node and am ...
0
votes
1answer
28 views
Gas requirement of function “testCompile.showString() high: infinite”
I have written simple function in remix.
pragma solidity ^0.5.0;
contract testCompile{
string myString = "Hello World";
function showString() public view returns (string memory){...
0
votes
2answers
32 views
Save all customers who buy an item online [closed]
I am writing a contract where I am trying to save the account addresses of customers who buy an item online. I tried it with arrays but it did not work. Can anyone please suggest a way of doing this?
0
votes
1answer
19 views
Function to transfer tokens to a second address with fixed percentage
I'm trying to code a transfer function that automatically sends tokens to a second address taking a specific percentage from the original sent value.
What I wrote:
address public _ExtAddress;
...
0
votes
0answers
15 views
Can't call contract function in Remix in Web3 provider mode, but it works in Javascript VM
A simple contract for addition, an error is reported when calling the function add in Web3 provider mode:
"Gas estimation errored with the following message (see below). The transaction execution ...
0
votes
1answer
18 views
Problem understanding the owner assignment
Suppose I have 3 contracts, namely Owner, B and C:
contract Owned {
address public owner;
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(...
0
votes
2answers
29 views
use the caller of the wrapper function to call the inner function
Suppose, I have 2 contracts A and B:
contract A{
function someMethod() public{
// Something happens here
}
}
And contract B containing its instance and its wrapper function
...
