我在通过松露生成的ABI调用智能合约功能时遇到问题。我正在使用JSON方法以python代码加载文件。文件已成功加载，但是在调用函数时会生成错误
智能合约代码
pragma solidity >=0.4.22 <0.6.0;
contract Greeter
{
string public greeting;
constructor() public
{
greeting = 'Hello';
}
function setGreeting(string memory _greeting) public
{
greeting = _greeting;
}
function getGreeting() view public returns(string memory)
{
return greeting;
}
}
Web3.py脚本
import sys
import json
from web3 import Web3, HTTPProvider
ganache_cli="http://127.0.0.1:8545"
web3=Web3(Web3.HTTPProvider(ganache_cli))
print(web3.isConnected())
with open("/home/khizar/tutorial/Tutorial4/build/contracts/Greeter.json") as f:
info_json = json.load(f)
abi = info_json["abi"]
address=web3.toChecksumAddress("0x76a1bcb1803840602544d83212daec083d68fba2")
contract = web3.eth.contract(address=address, abi=abi)
'''print(contract.functions.getGreeting().call())'''
脚本输出：
True
Traceback (most recent call last):
File "app4.py", line 24, in <module>
print(contract.functions.getGreeting().call())
File "/home/khizar/tutorial/lib/python3.6/site-packages/web3/contract.py", line 1106, in call
**self.kwargs
File "/home/khizar/tutorial/lib/python3.6/site-packages/web3/contract.py", line 1355, in call_contract_function
return_data = web3.eth.call(call_transaction, block_identifier=block_id)
File "/home/khizar/tutorial/lib/python3.6/site-packages/eth_utils/functional.py", line 22, in inner
return callback(fn(*args, **kwargs))
File "/home/khizar/tutorial/lib/python3.6/site-packages/web3/eth.py", line 293, in call
[transaction, block_identifier],
File "/home/khizar/tutorial/lib/python3.6/site-packages/web3/manager.py", line 110, in request_blocking
raise ValueError(response["error"])
ValueError: {'message': 'VM Exception while processing transaction: revert', 'code': -32000, 'data': {'0x02595810ac6841fa8464521a96ce3ae9592f2a2dcab504ae8506d014820e8128': {'error': 'revert', 'program_counter': 103, 'return': '0x'}, 'stack': 'o: VM Exception while processing transaction: revert\n at Function.o.fromResults (/usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:10:81931)\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:47:121235\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1853218\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:26124\n at i (/usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:41179)\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1210468\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:105466\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:32:392\n at c (/usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:32:5407)\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:32:317\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1871644\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:23237\n at o (/usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:26646)\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:26124\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1864681\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1862544\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:61:1889757\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:23237\n at o (/usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:26646)\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:26124\n at /usr/local/lib/node_modules/ganache-cli/build/ganache-core.node.cli.js:2:5439\n at FSReqWrap.args [as oncomplete] (fs.js:140:20)', 'name': 'o'}}