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How can I read/ get a data that has ben sent to my smart contract ?

I tested sendTransaction({data: xyz }) and when I tried to get this data from the Smart Contract using msg.data I got NULL this means the data wasn't sent to the SC , any help ? a need the line code of the transaction with a data

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  • please give example code of both your smart contract and your interfacing method (geth?) to try this. otherwise it is hard to help out specifically. – SCBuergel.eth May 9 '16 at 12:37
  • token.addAssets.sendTransaction(1,{from: web3.eth.accounts[0], value: web3.toWei(1, 'ether'), data: web3.toHex("0x228aef67c65077f864d9f5e00697578627f3b331")}); this is my transaction – sourh May 9 '16 at 13:42
  • this is my smart contract function – sourh May 9 '16 at 13:47
  • function addAssets(int amount) returns (bytes) {ad=msg.data; if (msg.sender == 0xd1b4b395a0f9deff0275c3cca2eeb9539af365e2) balanceOf[msg.sender]=balanceOf[msg.sender]+amount; else throw; return ad; } – sourh May 9 '16 at 13:47
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Assume you have a solidity function inside your smart contract which accepts data in the form of e.g. an integer called xyz:

function takeData(int xyz)

Now in e.g. geth you can create an instance of that smart contract and call the function by:

contractInstance.takeData.sendTransaction(12345, {from: web3.eth.accounts[0]})

You can find a complete walk-through example which I created for our teaching efforts at Validity Labs on my github: https://github.com/SCBuergel/timeLock-smartContract

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