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Results tagged with contract-debugging
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user 131
questions for finding and squashing bugs in smart contracts and decentralized development
3
votes
Accepted
Can't increase contract balance. Bug?
As of Solidity 0.4, contracts must explicitly allow themselves to receive ETH by defining a fallback function with the payable modifier. It would look like this in your case:
function() payable {}
…
- 37.3k
6
votes
Accepted
Why isn't msg.sender.send getting called?
In your contract you are trying to send 1 finney, but you are only providing your contract with 0.1 finney... A Finney is 0.001 ETH, not 0.0001
- 37.3k
4
votes
Accepted
Why variable A's value does not change by calling function to change it?
The issue is that the argument A in the function changeA is being set to 0 instead of the global variable A that you intend.
To fix this, either change the name of the argument to something else, li …
- 37.3k
2
votes
Accepted
Why Are These Values Not Immutable
No values in solidity are immutable if your contract's logic chooses to change them. To protect against overwriting, you need to use a flag of some sort to mark an ID as used.
If one of your variabl …
- 37.3k
3
votes
Accepted
Contract to contract send
Often, when you send to another contract, you run into an out-of-gas error. This can be fixed by manually setting the gas that you want to supply, using the .gas() property.
owner.call.value(fee).ga …
- 37.3k
0
votes
What is the most efficient way to map two different key types to a struct?
You can simply map the licence to an address, and then do two lookups to dereference a licence.
mapping(string => address) mcyclelicences;
function getMcycleByLic(string _license) public view retur …
- 37.3k
29
votes
Accepted
How can I debug a smart contract?
The Remix IDE has a great integrated block-by-block simulator and debugger.
Ganache allows fast contract testing without the hassle of running a node.
Once the contract is live, the etherscan.io blo …
- 37.3k
4
votes
Accepted
Exception in Contract Reverts Entire Stack, Uses all Gas
Yes, all EVM exceptions cause all state changes to be rolled back, and all gas is forfeit to the miner. Thus, while throwing errors is convenient, it sometimes makes sense to just return some error v …
- 37.3k
3
votes
Accepted
Geth What does the eth.contract(abi).at function do?
This function creates a new MyContract object with the address field set to the argument.
You should pass in the address of an already deployed contract.
The function returns an object that you ca …
- 37.3k