Erc 1155 nft contract help

Solidity Programming
#1

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “@openzeppelin/contracts/token/ERC1155/ERC1155.sol”;

import “@openzeppelin/contracts/utils/Counters.sol”;

contract CryptoR1155 is ERC1155 {

using Counters for Counters.Counter;

Counters.Counter private _tokenIds;

constructor () ERC1155(“CryptoR1155”, “CNR”){}

struct Artwork{

uint256 id;

uint256 totalSupply;

address payable creator;

address tokenAddress;

string uri;

uint8 royalty;

}

mapping(uint256 => Artwork) public Artworks;

function createArtwork(string memory uri, uint256 totalSupply, uint8 royalty) public returns(uint256){

require(royalty > 0, "Royalty cannot be zero or smaller than zero");

_tokenIds.increment();

uint256 newArtworkId = _tokenIds.current();

_safeMint(payable(msg.sender), newArtworkId);

Artworks[newArtworkId] = Artwork(newArtworkId, payable(msg.sender), address(this), uri, royalty);

return newArtworkId;

}

function tokenURI(uint256 tokenId) public view override returns (string memory) {

require(_exists(tokenId), "ERC1155Metadata: URI query for nonexistent token");

return Artworks[tokenId].uri;

}

function tokenSupply(uint256 tokenId) public view override returns (uint256 totalSupply) {

require(_exists(tokenId), "ERC1155Metadata: totalSupply query for nonexistent token");

return Artworks[tokenId].totalSupply;

}

function getRoyalty(uint256 tokenId) external virtual view returns(uint8 royalty){

require(_exists(tokenId), "ERC1155Metadata: Royalty query for nonexistent token");

return Artworks[tokenId].royalty;

}

function getCreator(uint256 tokenId) external virtual view returns(address payable creator){

require(_exists(tokenId), "ERC1155Metadata: Creator query for nonexistent token");

return payable(Artworks[tokenId].creator);

}

}

#2

Hey what’s the issue?

#3

please can you see this contract for me i tried compiling this and getting numerous errors.

#4

what error are you getting, can you just copy them here, will be easier to debug with a known error rather than manually seeing line by line

#5

from solidity:
ParserError: Expected identifier but got ‘{’
–> CryptoR1155.sol:11:25:
|
11 | ERC1155Upgradeable, {
| ^

#6

Looks like you get unexpected comma there behind ERC1155Upgradeable try to delete it

#7

brother can you please try compiling this code in remix .

#8

from solidity:
ParserError: Expected identifier but got ‘{’
–> CryptoR1155.sol:12:5:

#9

from solidity:
DeclarationError: Undeclared identifier.
–> CryptoR1155.sol:40:13:
|
40 | require(_exists(tokenId), “ERC1155Metadata: URI query for nonexistent token”);
| ^^^^^^^

#10

can you just tell me this much that where can I find _exists documentation