SendTransaction - how to form a correct request

lore31 · May 2015

Hello Everybody,

I am building an Oracle that I use to check some online services.
I would like to use the JSON RPC request "send transaction" to call some functions that I defined in a contract (already mined and working).

In Alethzero, the way I would call that method is :

Now how should I form the request in, say, Javascript?

I tried:


web3.eth.sendTransaction({ "to": "5bbc2ceee99583200d6331ff4038ef7839f85bdd", "data" : '$0xb5f54de3\n0x878c60f5d633f36c2d754e9aa02f9440498017b3\n"fsdfs2"\n"dfsfsf2"\n"dasdas2"\n"fdgdfg2"\n"fsfsf2"\n"fsdfsd2"' })

... but it does not work. Please help.

Pranay · May 2015

Can you try with some sample string as data with same transaction, if that works than that is something to do with your data string.

lore31 · May 2015

Pranay said:
Can you try with some sample string as data with same transaction, if that works than that is something to do with your data string.

In alethzero (image above) the command works, as the data is actually saved (I can tell because I can retrieve it successfully).
Still when I run the command in JS, that does not produce any result.

lore31 · May 2015

Pranay said:
Can you try with some sample string as data with same transaction, if that works than that is something to do with your data string.

Btw, I tried so many different combinations: I would just need an example to understand what I am doing wrong!

Here is the code in the Solidity Contract :


function newContract (address employee,string32 startDate, string32 endDate, string32 jobTitle,string32 hoursOfWork,string32 skills, string32 rules ) returns (uint contractID)
{
...
}

Pranay · May 2015

you are not able to call even a simple get function ?

Pranay · May 2015

can you pass higher gas value

lore31 · May 2015


web3.eth.sendTransaction({ "to": "5bbc2ceee99583200d6331ff4038ef7839f85bdd", "value": 100000 ,"gas" : 999999999,"gasPrice": 100000 , "data" : '$0xb5f54de3\n0x878c60f5d633f36c2d754e9aa02f9440498017b3\n"fsdfs2"\n"dfsfsf2"\n"dasdas2"\n"fdgdfg2"\n"fsfsf2"\n"fsdfsd2"' })

Did that... does not work still.

I then tried the get method (should return an int)


// js
web3.eth.call({to: "878c60f5d633f36c2d754e9aa02f9440498017b3", data: "0xd2ba835e"})
// solidity
function returnNrContracts() constant returns(uint r){
...
}

But still, nothing to do. Should the value be higher?

Pranay · May 2015

yes, value should be higher.

lore31 · May 2015

I guess this is going to stay unsolved for now: I will try to use Python to send this request.

Pranay · May 2015

Does that works for you?

Pranay · May 2015

https://github.com/ethereum/web3.js/issues/166 this link may helpful to you.

tgerring · May 2015

data should be a hex string, i.e. "0x2D4909854A"
and for safety, all hex fields should be prefixed with "0x", which your to field is not

See https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sendtransaction for an example

lore31 · June 2015

tgerring said:
data should be a hex string, i.e. "0x2D4909854A"
and for safety, all hex fields should be prefixed with "0x", which your to field is not

See https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sendtransaction for an example

I tried what you suggested.. It did not work. Probably the link @Pranay posted is the issue I have.

Pranay · June 2015

It might be the case for doing transaction you should increase some gas value.

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