C-如何使用OpenSSL'；s BIO_write（）是否正确

我是OpenSSL新手。我知道BIO_write（BIO*b，const void*buf，int len）需要在循环中调用，但我不能完全确定是否正确使用了它。我编写了这样一个函数：

int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int nPacketLength)
{
    int32_t nPos = 0;

    if (!pBio || !pPacket || !nPacketLength)
        return -1;

    while (nPos < nPacketLength)
    {
        int32_t nNumberOfBytesWritten = BIO_write(pBio, &pPacket[nPos], nPacketLength - nPos);
        if (nNumberOfBytesWritten <= 0)
        {
            if (!BIO_should_retry(pBio))
                return -1;
        }
        else
        {
            nPos += nNumberOfBytesWritten;
        }
    }

    return nPos;
}

if (SendPacket(pBio, pPacket, nPacketLength) == nPacketLength)
{
    // Packet sent correctly.
}
else
{
    // Error occurred.
}

int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int32_t nPacketLength)
{
    int32_t nPos = 0;
    int32_t nNumberOfBytesWritten = 0;
    ...
    for (nPos = 0; nPos < nPacketLength; nPos += nNumberOfBytesWritten)
    {
        if ((nNumberOfBytesWritten = BIO_write(pBio, pPacket + nPos, nPacketLength - nPos)) <= 0)
        {
            if (BIO_should_retry(pBio))
            {
                nNumberOfBytesWritten = 0;
                continue;
            }

            return -1;
        }
    }

    return nPos;
}

---

这个函数看起来正确吗？感谢您的反馈。

在我的原始帖子中，我在重试BIO_write（）时没有将“nNumberOfBytes”重置为0

我最后做了这样的事情：

int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int nPacketLength)
{
    int32_t nPos = 0;

    if (!pBio || !pPacket || !nPacketLength)
        return -1;

    while (nPos < nPacketLength)
    {
        int32_t nNumberOfBytesWritten = BIO_write(pBio, &pPacket[nPos], nPacketLength - nPos);
        if (nNumberOfBytesWritten <= 0)
        {
            if (!BIO_should_retry(pBio))
                return -1;
        }
        else
        {
            nPos += nNumberOfBytesWritten;
        }
    }

    return nPos;
}

if (SendPacket(pBio, pPacket, nPacketLength) == nPacketLength)
{
    // Packet sent correctly.
}
else
{
    // Error occurred.
}

int32_t SendPacket(BIO * const pBio, const unsigned char * const pPacket, const int32_t nPacketLength)
{
    int32_t nPos = 0;
    int32_t nNumberOfBytesWritten = 0;
    ...
    for (nPos = 0; nPos < nPacketLength; nPos += nNumberOfBytesWritten)
    {
        if ((nNumberOfBytesWritten = BIO_write(pBio, pPacket + nPos, nPacketLength - nPos)) <= 0)
        {
            if (BIO_should_retry(pBio))
            {
                nNumberOfBytesWritten = 0;
                continue;
            }

            return -1;
        }
    }

    return nPos;
}

int32\u t SendPacket（BIO*const pBio，const unsigned char*const pPacket，const int32\u t npackletlength）
{
int32_t nPos=0；
int32_t n写入的字节数=0；
...
对于（nPos=0；nPosif（（nNumberOfBytesWrite=BIO_write（pBio，pPacket+nPos，pPacketLength-nPos））函数看起来不错。你有没有遇到任何问题？除了pPacketLength不应该是-1。在我的应用程序中，BIO_写入块需要1或2分钟。你知道吗？