如何判断串口状态

Question

大家好，我做了一个小程序
当我拔掉串口线的时候，我想让界面的指示灯图片变成灰色
可是如何判断串口状态阿

Answer 1

我是这么处理的
switch(GetLastError())
{
case ERROR_ACCESS_DENIED:
{
pOwner->m_bIsRece = FALSE;
pOwner->m_hThreadRec = NULL; SetCommMask(pOwner->m_hComm, 0);
ResetEvent(pOwner->m_olWait.hEvent);
CloseHandle(pOwner->m_hThreadRec);
pOwner->Close();
}break;
case ERROR_IO_PENDING:GetOverlappedResult(pOwner->m_hComm, &pOwner->m_olWait, &dwLen, true);break;
}
}

Answer 2

带都上了还要怎么详细呢？
那我再多贴点吧
void CWEComm::ThreadReceive(CWEComm* pOwner)
{
if(!SetCommMask(pOwner->m_hComm, EV_RXCHAR|EV_ERR))
return; COMSTAT statCom;
DWORD dwError, dwLen, dwMask; while(pOwner->m_bIsRece && pOwner->IsOpen())
{
dwMask = 0;
if(!WaitCommEvent(pOwner->m_hComm, &dwMask, &pOwner->m_olWait))
{
switch(GetLastError())
{
case ERROR_ACCESS_DENIED:
{
pOwner->m_bIsRece = FALSE;
pOwner->m_hThreadRec = NULL; SetCommMask(pOwner->m_hComm, 0);
ResetEvent(pOwner->m_olWait.hEvent);
CloseHandle(pOwner->m_hThreadRec);
pOwner->Close();
}break;
case ERROR_IO_PENDING:GetOverlappedResult(pOwner->m_hComm, &pOwner->m_olWait, &dwLen, true);break;
}
} if(dwMask & EV_ERR)
ClearCommError(pOwner->m_hComm, &dwError, &statCom); if(dwMask & EV_RXCHAR)
{
ClearCommError(pOwner->m_hComm, &dwError, &statCom);
if(statCom.cbInQue>0)
::SendMessage(pOwner->m_hNotifyWnd, pOwner->m_uMsgID, statCom.cbInQue, 0);
}
}
}