Re: Getting transaction size/fees before sending

Hi

I assume you're coding in PHP? if not i can rewrite it in another lang for you, but here is a working example i've built for you to specify an exact fee for a bitcoin transaction.. this also works for other alt coins. Thank me later. Cool

Code:

$unspentTransactions = $bitcoin->listunspent(0, 9999999); //First we find out all our unspent transactions from where we can withdraw

$collectedTransactions = [];

foreach ($unspentTransactions as $unspentTransaction) {

if ($collectedAmount < $amountToSend) {
$collectedTransactions[] = [
'txid' => $unspentTransaction['txid'],
'vout' => $unspentTransaction['vout']
];

$collectedAmount += $unspentTransaction['amount'];
} else {

break;
}
}

$change_amount = $collectedAmount-$amount-$fee;

if ($change_amount <= 0.00000000) {

$output2 = array(

"".$recipient."" =>"".$amount-$fee.""
);

}

else {

$output2 = array(

"".$recipient."" =>"".$amount."",

"".$change_addr."" =>"".$change_amount."",

);

}

$maketxnraw = $bitcoin->createrawtransaction($collectedTransactions, $output2);

$signtxn = $bitcoin->signrawtransactionwithwallet($maketxnraw);

$returnsignedhex = $signtxn['hex'];

$sendpayment = $bitcoin->sendrawtransaction($returnsignedhex);

$txid = $sendpayment;