get download speed

最新推荐文章于 2024-02-16 13:55:14 发布

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本文介绍了一个简单的下载速度计算算法，该算法通过记录当前时间和已接收的字节数来计算平均下载速度，并据此估算剩余下载时间。

void DownloadData::calcSpeed(quint64 bytesReceived)
{
	time_t nCurrentTime = time(NULL);
	quint64 nNewReceiveSize = bytesReceived;
	if(nCurrentTime - m_nOldTime > 5)
	{
		m_nSpeed = (nNewReceiveSize - m_nOldReceiveSize)/(nCurrentTime - m_nOldTime);

		m_nOldTime = nCurrentTime;
		m_nOldReceiveSize = nNewReceiveSize;
	}
	if(m_nSpeed > 0)
		m_nTimeLeft = (getSize() - nNewReceiveSize)/m_nSpeed;
	else
		m_nTimeLeft = INT_MAX;
}