Questions tagged [remix]
Questions about Remix, an online browser compiler for Solidity, formerly called Browser Solidity.
1,465
questions
0
votes
1answer
22 views
cannot be able to connect to private blockchain hosted at local VM
I want to use remix IDE and want to connect web3provider which needs to be connected to private blockchain running on VM locally.
My system is running on Windows 10 and I am running the VM on my local ...
0
votes
1answer
8 views
Cannot call functions from another deployed contract that inherits yet another contract
I am just trying this using Remix editor. I am able to call functions from another deployed contract(plain as simple) but when that another deployed contract inherits yet another contract, Now the ...
0
votes
0answers
11 views
what to sign to close the contract on JVM?
Full Contract
I cannot sign the message correctly thus failing to close the contract.
0
votes
0answers
16 views
how to deploy usdt contract through remix browser [closed]
pragma solidity ^0.4.11;
/**
* Math operations with safety checks
*/
library SafeMath {
function mul(uint a, uint b) internal returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);...
0
votes
0answers
73 views
+50
Remix never returns a transaction - but everything works - why?
This code supposedly works. Its supposed to let the owner withdrawal collected ERC20 tokens in a contract.
It calls the balanceOf() for the erc20, then calls transfer().
Only have this error when ...
0
votes
1answer
32 views
Ethereum Smart contract calling a function in another smart contract that has a address payable return value give error
I am new to solidity. Anyway, I have written the following smart contract:
pragma solidity >=0.4.22 <0.7.0;
contract SP {
address BlockAddress;
bytes32 _Mhash;
function ...
1
vote
1answer
24 views
str.slice is not a function
I ran two command lines of web3 and it returned an error
> length ='0000000000000000000000000000000000000000000000000000000000000002'
...
0
votes
1answer
37 views
One contract accessing data from another fails
I am trying to get two contracts to interact:
pragma solidity ^0.5.10;
contract C2 {
address public addr;
constructor(address per) public {
addr = per;
}
function ...
0
votes
0answers
24 views
Simple functions and constructors not working
I am working with a private blockchain, and am having a problem where simple functions and constructors simply fail to work. For instance:
constructor(address admin) public{
owner = msg....
0
votes
2answers
22 views
How do I get the return uint value of a method in Solidity contract from another contract
Trying to get the return function of a contract from another contract. Don't know what I am doing wrong.
I can see the return value when I call contract A directly but when I try calling the function ...
0
votes
1answer
22 views
Error While Compiling In Remix During Tutorial
During a tutorial on my first compile I received this error:
:1:1: Parser error: Expected import directive or contract definition.
pragma solidity ^0.5.12;
^
What's that about? How do I fix it? I'...
3
votes
0answers
16 views
Remix debugger ignores breakpoint
Description of issue
I'm trying to debug a simple contract using remix on chrome v. 65 on Ubuntu.
I must be doing something wrong, because I have the following issue:
When I place a breakpoint in ...
0
votes
1answer
21 views
Two smart contracts interact can't pass value when I using web3.js
I have two different smart contracts interaction_1 and interaction_2
I input the data(team) from remix ide.
What I want to accomplish is when user input team in user_input function at interaction_1,...
0
votes
0answers
25 views
not able to assign address to a public property using web3
while everything is working fine when working on remix ide but on truffle its not updaing value of a property (player2)
i am also returning that address value and its returning as it should be. but ...
4
votes
2answers
47 views
Verifying a Token Contract with Interface
I managed to deploy a token contract with interface on Kovan Testnet.
Now I wanted to verify the code. However this is a bigger problem than I thought.
The contract got successfully deployed to: ...
0
votes
2answers
41 views
Am I Generating Random Numbers In A Non-Mallable Fashion?
Would this be a non-malleable way to generate numbers for my particular use case?
Let me explain: I allow people to register for a lottery-type event.
If a winning seed belongs to their ticket set, ...
0
votes
1answer
26 views
Gas estimation errored using ERC20 in REMIX
I'm trying to test making some smart-contract that uses DAI ERC20 tokens on Kovan testnet (DAI contract on kovan is 0xc4375b7de8af5a38a93548eb8453a498222c4ff2). I developed this very simple contract ...
0
votes
1answer
64 views
Verify simple smart contract on etherscan
I'm having trouble with verification of smart contracts and some ERC20 tokens. The only tokens I was able to verify were the ones derived from ERC20Detailed. Here's a simple contract that I found on ...
0
votes
0answers
11 views
Random Number Generation, Appropriate case or no? [duplicate]
I'm building a lottery where I need to generate a list of random numbers.
Basically, I have a group of people who will commit to a prize by staking a certain amount of tokens to their commitment - ...
0
votes
0answers
8 views
TypeError: Function overload clash during conversion to external types for arguments
Why do I get following error "TypeError: Function overload clash during conversion to external types for arguments." when using compiler version ^0.5.0; but when I choose 0.5.2; and later releases ...
0
votes
0answers
31 views
Deploying contract using web3js but failed
I am a beginner for solidity 👶
My question about deploy using with web3js.
I have two smart contract and in main contract I have a createContract function which is create a new subtoken contract ...
0
votes
1answer
21 views
Web3.js is taking lot of time to return a promise
Web3 is taking time near about 5 minutes even after the transaction got 3 confirmations to return a promise from a smart contract which is deployed on kovan testnet. Please give some suggestion how to ...
0
votes
0answers
27 views
Undefined Contract
I am finally able to come up with a compilable code. As I attempt to verify the contract, the Remix - Ethereum output is "undefined". Someone advice me on what to do. My ABI is as follows:
[
{
"...
1
vote
2answers
39 views
Cannot install web3 on nodejs
When I try to install web3 using 'npm install ethereum/web3.js --save' command, I get the following error messages-
npm ERR! path git
npm ERR! code ENOENT
npm ERR! errno ENOENT
npm ERR! syscall ...
0
votes
1answer
17 views
Get array of structs by giving address as parameter
Here's my code:
contract company {
struct contractDetails {
string contractId;
string companyA;
string companyB;
address A;
address B;
uint256 ...
0
votes
1answer
75 views
I would like to 3 mappings
I am a beginner.
I would like to 3 mappings
I know 2 mapping looks like this:
mapping (address => mapping (address => uint256)) public allowed;
and my question is: is 3 mappings look like ...
1
vote
0answers
27 views
I am newbie here,I need some help in retrieving one particular use using a userid, how do we do that as per below code?
struct Rider{
//address riderAddr;
uint rider_Id;
bytes32 Rname;
bool set;
}
mapping(address => Rider) public riders;
function registerRider(address _riderAddr, uint _riderId, ...
0
votes
2answers
29 views
ParserError: Expected pragma
Hi guys.
I have got one big problem. When i try to compile my code i'm getting some kind of unusuall error.
I think everything is ok but when i try to "node compile.js" my main file ("inbox.sol") ...
0
votes
1answer
32 views
Function should return all objects stored in the mapping array
Here's my solidity code. And I want all the objects to be returned stored in mapping array contracts in the getContract method by giving address as a parameter to the getContract function.
pragma ...
0
votes
2answers
66 views
Remix Deploy Error encoding arguments
I'm building a simple fund raising smart contract and having problems deploying this through Remix. I'm wanting to set the "goal" and "minimum contribution" values (in wei) during the contract ...
0
votes
2answers
33 views
ParserError: Expected pragma, import directive or contract /interface/library definition
In an attempt to compile my ABI and verify my contract, I am getting the following warning: "ParserError: Expected pragma, import directive or contract /interface/library definition" on the first line ...
0
votes
0answers
38 views
Transactions go to an older contract address rather than the present deployed one
Though I have deployed a new contract but the transactions go to a previously deployed contract in my application. I'm attaching the screenshot of my Remix-ide code and the code for the front end ...
0
votes
1answer
21 views
# issue: Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
issue: Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? gas required exceeds allowance or always failing ...
4
votes
3answers
138 views
Remix now force to use https, how can i continue to use http://remix.ethereum.org?
Recently I was able to both use http://remix.ethereum.org or https://remix.ethereum.org, but today I was not able to direct by browser to the unsecure version of remix. The reason I need to do so is ...
0
votes
1answer
38 views
What I need to verify contract with open-source license?
i m deployed contract in etherscan mainnet. i m verify it with open-source license like (MIT, GNU). now the problem were i don't know were to define license in etherscan ?? and etherscan will validate ...
1
vote
1answer
48 views
Web3 - Assign nonce to smart contract transact
I have a smart contract.
I want to execute one of its state modifying functions.
This is the code:
const result = await smartContractObject.methods
.addSomething(_valueToAdd)
.send( { gas: '...
1
vote
2answers
39 views
“Gas estimation failed” on Ropsten with Invalid RPC JSON
I'm running into an issue going through a basic example in "Mastering Ethereum"...
I have a Faucet contract (on Ropsten) per the book that looks like...
pragma solidity ^0.5.1; //mastering ethereum ...
2
votes
2answers
44 views
Web3 - Access return value of events
I want to get the value that my smart contract returns in javascript.
Here is the contract. (version 0.4.25 - web3 version 1.2)
pragma solidity ^0.4.25;
contract SimpleStorage {
uint public ...
1
vote
0answers
35 views
Error: Operator << not compatible with types bytes1 and int_const 1 return b10 << 1;
I don't know how to correct the code of function 4 & 5.
pragma solidity ^0.4.4;
contract C {
bytes1 b10 = 0x6c;// l-> 0110 1100 6c转换为10进制-》12*16^0+6*16^1=108
bytes1 b11 = 0x69;
...
0
votes
1answer
18 views
Call to other contract method return false when two parameters are passed
Caller Contract
Called.call(abi.encodeWithSignature("test(address, address)"),empAddress, empContAddress)
Called Contract
event ad(address);
function test(address e, address f)public{
...
0
votes
0answers
35 views
Error: Member “transfer” not found or not visible after argument-dependent lookup in address 0.4.4 [duplicate]
pragma solidity ^0.4.4;
contract PayableWorld {
function deposite () payable{
address dyw2 = 0x1De57DD112092D60F45c9e2045424003e6B2C75a;
dyw2.transfer(msg.value);
}
how can i change the ...
0
votes
1answer
29 views
Parser Error On Remix Solidity ERC20 Smart Contract Token
This Is My First ERC20 Smart Contract Token. I Am Trying To Compile It Using Solidity 0.5.0. Plz Need Your Help Guys.
pragma solidity ^0.5.0;
contract TusharCoin {
uint256 public totalSupply; ...
0
votes
1answer
33 views
How can I store multiple strings mapped to an address in Smart Contract (solidity)?
I want to save multiple files in Ipfs and store its hashes mapped to an user address. I thought of having an array mapped to address and pushing to it, but does not seem to be the right approach. ...
0
votes
1answer
40 views
ERC20 - Approve & TransferFrom not working
The getTokenBalance function seems to retrieve data from the ERC20 contract just fine so I don't think there is an issue with how I'm using the interface. Additionally, I also tested out separating ...
0
votes
0answers
31 views
Solidity Contract cost calcuation
How can I calculate the cost of running my contract and running each function?
I've noticed in Ethereum when a transaction is successful we have a transaction cost and a execution cost, what the ...
0
votes
0answers
9 views
DigixDAO smart contract functionality/pattern
Can someone explain the usage of initialisation functionality and _resolver arguments in the various constructors of digixdao? i.e. following contract What is a resolver and isn't the job of a ...
0
votes
1answer
25 views
Getting information from contract address?
pragma solidity ^0.5.0;
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol';
contract SubToken{
using SafeMath for uint;
struct token{
...
0
votes
1answer
12 views
interface function declarations to be used internally
Is it possible to use externally declared interface functions internally in a smart contract? i.e. say contract A inherits interface A, would contract A be able to implement the functions from ...
0
votes
1answer
57 views
Is it possible to insert some custom data in the DATA field of an Ethereum Transaction?
i am working on trying to get some data encoded/inserted into an ethereum transaction.
Let me describe my environment first, i am using Web3py, Ganache and Remix IDE. I am able to successfully ...
-3
votes
2answers
46 views
Trying to create an instance of an abstract contract
pragma solidity ^0.5.0;
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol';
contract SubToken{
mapping(address => uint) balances;
...
