MFC一部串口接收数据，显示readfile成功，但没接到数据。

[qq_30986209]

底程序：
void CComPort::ComReadData()
{
BOOL bRead = TRUE;
BOOL bResult = TRUE;
DWORD dwError = 0;
DWORD BytesRead = 0;
char RXBuff;
COMSTAT comstat;


//m_ROverLapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

m_ROverLapped.Offset = 0;
m_ROverLapped.OffsetHigh = 0;



//<>一个EV_RXCHAR 接收数据信号触发出，循环接收缓存区全部数据;
while (TRUE)
{
ComDetectStop();
ClearCommError(m_hPort, &dwError, &comstat);

if (bRead)
{
bResult = ReadFile(m_hPort, &RXBuff, 1, &BytesRead, &m_ROverLapped);
if (!bResult)
{
switch (dwError = GetLastError())
{
case ERROR_IO_PENDING: // asynchronous i/o is still in progress go to GetOverlappedResults();
{
bRead = FALSE;
break;
}
default:
{
break;
}
}
}
}
if (!bRead)
{
bRead = TRUE;
bResult = GetOverlappedResult(m_hPort, &m_ROverLapped, &BytesRead, false);
while (!bResult)
{
ComDetectStop();
bResult = GetOverlappedResult(m_hPort, &m_ROverLapped, &BytesRead, false);
}
}
Comm_RXCHAR(RXBuff);

if (comstat.cbInQue == 0)
break;
}
}
void CDevice::Comm_RXCHAR(char c /*= 0*/)
{
static CString sTempCode;
if (c == -52)
{
m_sCodeReceived = sTempCode;
m_sCodeReceived.Trim();//保存反馈数据;
sTempCode.Empty();
m_bReceived = true;
}
}
调用程序：
BOOL CDevice::GetDevice(CString &sCode, short nTimeout /*= 3000*/)
{
m_bReceived = false;

ComReadData();
short nIndex = 0;
while (nIndex < nTimeout)
{
if (m_bReceived)
{
sCode = m_sCodeReceived;
return true;
}
nIndex++;
Sleep(1);
}
ComReset();
return false;
}
按键调用：
void CRS485_2_1Dlg::OnBnClickedButton2()
{
// TODO: 在此添加控件通知处理程序代码
CString sCode;
if (!m_device.GetDevice(sCode))
{
SetDlgItemText(IDC_EDIT2, _T("获取失败"));
return;
}
SetDlgItemText(IDC_EDIT2, _T(""));//清空;
SetDlgItemText(IDC_EDIT2, sCode);
}

[zgl7903]

Comm_RXCHAR 中的逻辑不完整吧

void CDevice::Comm_RXCHAR(char c /*= 0*/)
{
  static CString sTempCode;
  if (c == -52)
  { 
   m_sCodeReceived = sTempCode;
   m_sCodeReceived.Trim();//保存反馈数据;
   sTempCode.Empty();
   m_bReceived = true;
  }
  else
  {
    sTempCode += c;
  }
}

[zgl7903]

在接收处设置断点调试， 调试是一个程序员必备的基本技能

[qq_30986209]

加了这句之后会有乱码，比如我发123，收到的是 1233烫。

[sevancheng]

设置同步模式处理起来简单，重叠IO 实际读取数量不一定=你要读取的数量，你这种是正常现象