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怎么判斷串口已發(fā)送完畢？(qt5, c++)？

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慕俠2389804 2019-04-11 11:07:05

怎么判斷串口已發(fā)送完畢？(qt5, c++)

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慕桂英3389331

TA貢獻(xiàn)2036條經(jīng)驗(yàn) 獲得超8個(gè)贊

12345678910111213141516171819202122232425262728293031323334 寫6個(gè) 異步延遲等待1秒肯定能寫完然后判斷重疊結(jié)構(gòu)判斷寫的數(shù)據(jù) 跟真正寫的數(shù)據(jù) 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;}

反對回復(fù) 2019-04-15

當(dāng)年話下

TA貢獻(xiàn)1890條經(jīng)驗(yàn) 獲得超9個(gè)贊

寫6個(gè) 異步延遲等待1秒肯定能寫完然后判斷重疊結(jié)構(gòu)
判斷寫的數(shù)據(jù) 跟真正寫的數(shù)據(jù) 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;
}