PQC/wallet.cpp:2466 CreateTransaction函数详解

bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet,
                                int& nChangePosInOut, std::string& strFailReason, const CCoinControl* coinControl, bool sign)
{
    CAmount nValue = 0;
    int nChangePosRequest = nChangePosInOut;
    unsigned int nSubtractFeeFromAmount = 0;
    for (const auto& recipient : vecSend)
    {
        if (nValue < 0 || recipient.nAmount < 0)
        {
            strFailReason = _("Transaction amounts must not be negative");
            return false;
        }
        nValue += recipient.nAmount;

        if (recipient.fSubtractFeeFromAmount)
            nSubtractFeeFromAmount++;
    }
    if (vecSend.empty())
    {
        strFailReason = _("Transaction must have at least one recipient");
        return false;
    }

##首先对函数参数进行介绍：

1. vecSend: 是recipient的数组 recipient = {scriptPubKey, nValue, fSubtractFeeFromAmount}，scriptPubkey是包含了目标公钥的脚本 nValue是要发送给目标的金额，fSubtractFeeFromAmount是一个Bool型数据，代表是否要从目标账户中扣除小费
2. wtxNew:
3. reservekey: 可以看做一个key pool，从中可以取出密钥
4. nFeeRet: 已经凑集的小费金额
5. nChangePosInOut: change（零钱）在vout中的下标
6. sign: bool型变量，代表是否要签名产生sigdata