Method prepareTransaction

src/qt/walletmodel.cpp:151–234

}

WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransaction &transaction, const CCoinControl& coinControl)
{
    transaction.getWtx() = nullptr; // reset tx output

    CAmount total = 0;
    bool fSubtractFeeFromAmount = false;
    QList<SendCoinsRecipient> recipients = transaction.getRecipients();
    std::vector<CRecipient> vecSend;

    if(recipients.empty())
    {
        return OK;
    }

    QSet<QString> setAddress; // Used to detect duplicates
    int nAddresses = 0;

    // Pre-check input data for validity
    for (const SendCoinsRecipient &rcp : recipients)
    {
        if (rcp.fSubtractFeeFromAmount)
            fSubtractFeeFromAmount = true;
        {   // User-entered bitcoin address / amount:
            if(!validateAddress(rcp.address))
            {
                return InvalidAddress;
            }
            if(rcp.amount <= 0)
            {
                return InvalidAmount;
            }
            setAddress.insert(rcp.address);
            ++nAddresses;

            vecSend.emplace_back(CRecipient{DecodeDestination(rcp.address.toStdString()), rcp.amount, rcp.fSubtractFeeFromAmount});

            total += rcp.amount;
        }
    }
    if(setAddress.size() != nAddresses)
    {
        return DuplicateAddress;
    }

    // If no coin was manually selected, use the cached balance
    // Future: can merge this call with 'createTransaction'.
    CAmount nBalance = getAvailableBalance(&coinControl);

    if(total > nBalance)
    {
        return AmountExceedsBalance;
    }

    try {
        auto& newTx = transaction.getWtx();
        const auto& res = m_wallet->createTransaction(vecSend, coinControl, /*sign=*/!wallet().privateKeysDisabled(), /*change_pos=*/std::nullopt);
        if (!res) {
            Q_EMIT message(tr("Send Coins"), QString::fromStdString(util::ErrorString(res).translated),