怎么判断串口已发送完毕？(qt5, c++)？

Question

怎么判断串口已发送完毕？(qt5, c++)

Answer 1

12345678910111213141516171819202122232425262728293031323334写6个 异步延迟等待1秒肯定能写完 然后判断 重叠结构判断写的数据 跟 真正写的数据 是不是相等 bool CComControl::Send(BYTE* pBuff,DWORD dwBytesSend){     if (!PortOpened()) return false;         BOOL wRes;    DWORD dwBytesW;    wRes = WriteFile(m_hCom,pBuff,dwBytesSend,&dwBytesW,&m_ovWrite);    if (!wRes)    {        if (GetLastError() == ERROR_IO_PENDING)        {            WaitForSingleObject(m_ovWrite.hEvent,1000);            wRes = GetOverlappedResult(m_hCom,&m_ovWrite,&dwBytesW,false);            if (!wRes || dwBytesW !=dwBytesSend)            {                ClearInOut();                                 return false;            }        }        else        {            ClearInOut();                         return false;        }    }     return true;} 

Answer 2

写6个 异步延迟等待1秒肯定能写完 然后判断 重叠结构判断写的数据 跟 真正写的数据 是不是相等bool CComControl::Send(BYTE* pBuff,DWORD dwBytesSend){if (!PortOpened()) return false;BOOL wRes;DWORD dwBytesW;wRes = WriteFile(m_hCom,pBuff,dwBytesSend,&dwBytesW,&m_ovWrite);if (!wRes){if (GetLastError() == ERROR_IO_PENDING){WaitForSingleObject(m_ovWrite.hEvent,1000);wRes = GetOverlappedResult(m_hCom,&m_ovWrite,&dwBytesW,false);if (!wRes || dwBytesW !=dwBytesSend){ClearInOut();return false;}}else{ClearInOut();return false;}}return true;}