i'm developing a python app. This app is just to get data from the blockchain. In web3.js it all works good, but i need to do it in python (the client wants a python app). It all works almost good; The script does what it needs to do, but when calling the get function i get a strange output (using the get function on remix or web3.js whit a nodeJs api that i wrote works just perfect) :
D:\pytoh\b_get\Scripts\python.exe C:/Users/Alessandro/PycharmProjects/pytoh/b_get/bget.py
True
[(b'\xe9:=\xd87/\x98\x00\xe4\x89\xe3\x8eb[c\x9cj\xc4\xa3\xa2b\x1d\x9a\xf0%\x1d\xdaB\xb7\xd9\xc4\xe3',
b'\xe9:=\xd87/\x98\x00\xe4\x89\xe3\x8eb[c\x9cj\xc4\xa3\xa2b\x1d\x9a\xf0%\x1d\xdaB\xb7\xd9\xc4\xe3')]
Process finished with exit code 0
The output that i need is like this (i don't understand why the py output is like that):[0xe93a3dd8372f9800e489e38e625b639c6ac4a3a2621d9af0251dda42b7d9c4e3,0xe93a3dd8372f9800e489e38e625b639c6ac4a3a2621d9af0251dda42b7d9c4e3]
The python script is simple (i'm still writing it):
import json
from web3 import Web3
w3 = Web3(Web3.HTTPProvider('http://127.0.0.1:7545'))
print(w3.isConnected())
with open("ABI.json") as f:
info_json = json.load(f)
abi = info_json["output"]["abi"]
address = "0x1305ef6377fe8cB7C6dD7Eb2B6cAD83A34fC7503"
get = w3.eth.contract(address=address, abi=abi)
result=get.functions.getUser("0xe93a3dd8372f9800e489e38e
625b639c6ac4a3a2621d9af0251dda42b7d9c4e3").call()
print(result)
And this is the smart contract that the client wrote:
pragma solidity ^0.4.26;
pragma experimental ABIEncoderV2;
contract crud{
address owner;
constructor() public{
owner = msg.sender;
}
modifier onlyOwner () {
require(msg.sender == owner);
_;
}
struct user{
bytes32 hash_json;
bytes32 hash_corso;
}
mapping (bytes32 => user[]) public users;
function setUser(bytes32 _hash, bytes32 _hash_json, bytes32 _hash_corso) onlyOwner public {
user memory usr;
usr.hash_json=_hash_json;
usr.hash_corso= _hash_corso;
users[_hash].push(usr);
}
function getUser(bytes32 _hash) view public returns (user[] memory) {
return users[_hash];
}
}
Thank for your help!
The result is a byte array. When you print it, it converts control characters to hex but prints readable characters.
To get a full hex string, try this:
result = bytearray([22,32,7,67,14,87,90]) # for testing
hxstr = "".join(["{:02x}".format(v) for v in result])
print("0x"+hxstr)
Output
0x162007430e575a