Questions tagged [hex]
The hex tag has no usage guidance.
19
questions
0
votes
1answer
13 views
String to Bytes Converts to Incorrect Value
I have a string array stored in memory as
https://cloudflare-ipfs.com/ipfs/QmSXDsFeNaPa3CJKmn8WKBnA421Zv5r3Ra8n71LZhvEi9s
This should convert to ...
0
votes
1answer
9 views
Encoding arguments for UniswapV3 trade function
I am trying to encode arguments to call the UniswapV3ExchangeAdapter through the Set-Protocol TradeModule. The UniswapV3ExchangeAdapter has a function which is called generateDataParam that given hops ...
0
votes
1answer
17 views
Decode hexadecimals gas and gas price values "0xd9c5"
Hello i have following kvp:
{
gas: "0xd9c5"
}
But the ABI do not have gas func and the interface is not able to decode it, any idea how to decode the gas to extract the value when is ...
0
votes
0answers
19 views
Solidity: Converting a hex-string into bytes efficiently
I need to convert a string variable (passed to a function), containing a hex-string, into bytes in Solidity. In a way, this is the same as the following, just that the string variable will be passed ...
1
vote
1answer
29 views
Understand txdata in ethereum
I have the following output:
initialize(string,string,uint8), txdata: ...
4
votes
1answer
125 views
How do you handle the hex prefix without the value (only "0x")?
First, I'm caling function foo() (from another contract) that returns me a uint in the form of bytes.
Then, I'm using BytesLib.toUint(foo(), 0) to retrieve the uint.
When the value is supposed to be 1,...
0
votes
1answer
17 views
How many UTF-8 chars can you fit in a 256 bit hex word?
In Ethereum transactions, you can use the Data field to send text. Here's an example testnet transaction.
https://ropsten.etherscan.io/tx/...
0
votes
1answer
29 views
Check if calldata contains string
I have a function that is called with some data - "SOMETHING".
function checker(address _from, uint _value, bytes calldata _data) external{
//HOW to check if _data contains "...
0
votes
1answer
101 views
Hyperledger Besu: Unable to decode the hex string returned by solidity function containing multiple values
I have set up a Hyperledger Besu network for private transactions using Orion.
I am using a javascript client to write to and read data from a smart contract
written in Solidity. I am following the ...
2
votes
1answer
393 views
json rpc hex string weird padding/encoding
When sending eth_call to get erc20 token WETH name and symbol I get hex response padded with bunch of zeros and a mysterious digit '2'.
for symbol I get response:
"...
1
vote
0answers
63 views
0
votes
1answer
1k views
web3 - web3.utils.toHex zeros length
I'm trying to send 12 integer as bytes to a contract function. If I use
web3.utils.toHex(12)
the variable will become 0xc
The problem is that when contract function parses bytes, it reads uint256, ...
1
vote
0answers
61 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'...
3
votes
1answer
811 views
Encoded input params
I created a simple test contract with a single method:
pragma solidity ^0.4.24;
contract SimpleTest {
function testFunc(string name, bool isFirst) public {
//do stuff
}
}
I'm ...
0
votes
1answer
163 views
Converting Log Topics to int64 correctly in Go
I currently use the code below to extract the ERC721 Token ID from Transfer Event Logs:
txHash := newLog.TxHash.Hex()
hexString := common.BytesToAddress(newLog.Topics[3].Bytes()).Hex()
flowerNum, _ :=...
2
votes
1answer
115 views
Leaf node with encodedPath containing only Hex-Prefix in Merkle Patricia Trie
A leaf node is defined as the tuple [encodedPath, value], and encodedPath uses the Hex-Prefix encoding. Is it possible we have a leaf node with encodedPath having only the prefix and no partial path ...
1
vote
1answer
590 views
Better ways to test bytes32 type using truffle testing framework
small quick question, when I store a bytes32 and retrieve it from truffle console, why is it showing in 64 bits?
Ex: 0x74657374737472696e6700000000000000000000000000000000000000000000
because this ...
1
vote
1answer
566 views
web3.toAscii for foreign languages
I have a function that takes bytes32 _name as a parameter and store it in a struct.
Let's say _name is either Chinese, Korean, or Japanese and from app.js I would convert the _name to hex to pass it ...
0
votes
1answer
183 views
Python How to make Filter topics: encode integers to its hex string representation
In the documentation: http://web3py.readthedocs.io/en/latest/filters.html
Quote "Subsequent topic items are the hex encoded values for indexed event arguments. In the above example, the second item ...
