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QUESTION
I am faced with the problem the truffle generates a different bytecode than solcjs (local compiler) and also than Remix (online compiler). And therefor I can't verify my contracts throght Etherscan (see https://etherscan.io/verifyContract)
My enviromnment:
...ANSWER
Answered 2017-Jun-22 at 19:12There's a compiler optimization in solc/truffle-compile that in this moment etherscan does not support when compiling contracts.
Sent a comment to etherscan about it!
QUESTION
I'm a beginner and I've been exploring ERC20 tokens. Since a couple of days I have been looking for a solution to this, but in vain.
The problem is the following. I am creating a contract, conforming to the ERC20 protocol. I want to add an extra functionality in the form of an oracle query. I.e., I want to use a service like "Oraclize", to fetch some external data, return the result. Depending on the result I would like to transfer some tokens or not.
1) The example token contract I've been working with is the following. It s the contract from CryptoPunks (https://github.com/larvalabs/cryptopunks/blob/master/contracts/CryptoPunksMarket.sol):
...ANSWER
Answered 2018-Jan-23 at 19:25I'm not sure if I can address you design questions as it seems more like a business problem than a coding/design issue (or I may not be understanding the question). If getToken
is your point of sale and you want to reject any requests when the exchange rate is too low, then just make that a condition you check with a require
statement. However, I will note that from the technical standpoint, you can't read events in a Solidity contract. You can only listen for them in a client which will receive the event(s) when the transaction is successfully mined.
I can, however, address your IDE issues. The reason for the failures is oraclizeAPI is dependent on already deployed contracts. They have a modifier which sets up the internal network of the contract depending on which environment it's running:
QUESTION
I'm trying to create a contract in Ethereum private network.
What I tried was:
Created the following contract in browser-solidity.
...ANSWER
Answered 2018-Jan-12 at 06:45You need to JSON.parse()
your ABI.
QUESTION
I've got a local instance of browser-solidity running with a bunch of .sol files open. Does anyone know where those source files are stored (on Mac OSX)? I can't find them anywhere.
...ANSWER
Answered 2017-Jun-22 at 16:37Browser-solidity stores the .sol files in the browser's local storage.
If you would like to view them you can view them:
- Chrome via
Developer tools > Application > Storage > Local storage
- Firefox via
Tools > Web Developer > Storage Inspector
(You may need to enable the storage tool in Firefox's Developer Settings)
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