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Visual C++串口通信开发入门与编程实践

  char StringOut[128];
  sprintf(StringOut, "the key value is %d\n", pMsg->wParam);
  OutputDebugString(StringOut);
  switch (pMsg->wParam) //the key value
  {
    case 13:
      //Enter
      if (GetFocus() == GetDlgItem(MY_OK_BUTTON))
      {
        OnOKButton();
        return TRUE;
      }
      else if (GetFocus() == GetDlgltem(MY_EXIT_BUTTON))
      {
        OnExitButton();
        return true;
      }
      break;
  }
}
    CCommtestDlg dlg;
    m_pMainWnd=&dlg;
    dlg.DoModal();
      m_hIcon=AfxGetAPP()->Loadlcon
m_ListBox[0].SubclassDlgItem(IDC_LIST1, this); //生成列表框，编辑框
................  //另3个列表框，编辑框也如此编写
m_Edit[0].SubclassDlgItem(IDC_EDITI, this);
................  //另3个列表框，编辑框也如此编写
for (int i; 0; i < 4; i++)
{
  if (m_Ports[i].InitPort(this, i + 1, i ==  = 0 ? 9600 : 19200))
  //初始化配置对话框
    m_Ports[i].StartMonitoring();
  else
  {
    m_Edit[i].SetWindowText("NOT FOUND");
    m_Edit[i].EnableWindow(FALSE);
    m_ListBox[i].EnableWindow(FALSE);
  }
}
void CCommtestdlg::OnSendButtonlButton1()
{
  char but[100];
  memset(&buf, 0, sizeof(buf));
  GetDlgItemText(IDC_ EDIT1, buf, sizeof(buf)); //得到编辑框中内容
  if (strcmp("NOT FOUND", buf == 0)
     return ;
  if (((CButton*)
    GetdlgItem(IDC_CHECK1))->GetCheck()) //得到检查框
  buf[strlen(buf)] = 13; m_Ports[0].WriteToPort(buf);
    //写数据到COM口
}
if (port <= 0 || port > 4)
  return  - 1;
if (ch == 13 && ((CButton*)GetDlgItem(IDC_ CHECKS + port - 1))
  ->GetCheck())
{
  m_ListBox[port - 1].AddString(m_strReceived[port - 1]);
  m_ListBox[port - 1].SetSel(m_ListBox[port - 1].GetCount() - 1,
    TRUE);
  (m_strReceived[port - 1]).Empty();
}

else if (((CButton*)GetdlgItem(IDC_CHECKS + port - 1))->GetCheck())
  m_strReceived[port - 1] += (char)ch;
else
{
  CString string;
  string += (char)ch;
  m_ListBox[port - 1].AddString(string);
  m_ListBox[port - 1].SetSel(m_ListBox[port - 1].GetCount() - 1,
    TRUE);
}
if (port <= 0 || port > 4)
  return  - 1;
CString string;
string = "Clear To Send";
m_ListBox[port - 1].AddString(string);
m_ListBox[port - 1].SetSel(m_ListBox[port - 1].GetCowit() - 1,
  TRUE);
m_ListBox[0].ResetContent();
char buf[50];
CFileDialog m_mapwayopen(TRUE, NULL, NULL, NULL,
  "txt文件(*.txt)|*.txt||");
CString m_wayfilename;
CFile m_nWayFile;
if (m_mapwayopen.DoModal() == IDOK)
{
  m_wayfilename = m_mapwayopen.GetPathName();
  m_nWayFile.Open(m_wayfilename, CFile::modeRead);
  m_wayfilename += '\0';
  SetDlgItemText(IDC_EDIT1, m_wayfilename); //得到编辑框中内容
  int len = m_nWayFile.Read(buf, 50);
  while (len)
  {
    m_Ports[0].WriteTbPort(buf);
    len = m_nWayFile.Read(buf, 50);
  }
} 
CConfigDlg::CConfigDlg(CWnd *pParent, DCB dcb): CDialog(CConfigDlg
  ::IDD, pParent)
{
  m_dcb = dcb;
}
CString strTemp;
strTemp.Format("%d", m_dcb.BaudRate); //显示在对话框中
((CComboBox*)GetDlgItem(IDqBAUDRATECOMBO))->SelectString(0,
  strTemp);
((CComboBox*)GetDlgItem(IDC - PARIIYCOMBO))->SetCurSel
  (m_dcb.Parity);
((CComboBox*)GetDlgItem(IDC_STOPBITSCOMBO))->SetCurSel
  (m_dcb.StopBits);
strTemp.Format("%d", m_dcb.ByteSize);
((CComboBox*)GetdlgItem(IDC_DATABITSCOMBO))->SelectString(0,
  strTemp);
m_hComm=NULL;
  m_ov.Offset=0;
  m_ov.OffsetHigh=0;
  m_ov.hEvent=NULL;
  m_hWriteEvent"NULL;
  m_ShutdownEvent=NULL;
  m_szWriteBuffer=NULL;
  m_bThreadAlive=FALSE;
do
{ SetEvent(m_hShutdownEvent);
  }while (m_bThreadAlive);
  TRACE("Thread ended\n");
  delete [] m_szWriteBuffer;
UINT portnr,  // portnumber (1..4)
UINT baud,  // baudrate
char parity,  // parity
UINT databits,  // databits
UINT stopbits,  // stopbits
DWORD dwCommEvents,  // EV_RXCHAR、EV_CTS等
UINT writebuffersize) // size to the writebuffer
assert(portnr > 0 && portnr < 5);
assert(pPortOwner != NULL);
if (m_bThreadAlive)
{
  do
  {
    SetEvent(m_hShutdownEvent);
  }
  while (m_bThreadAlive);
  TRACE("Thread ended\n");
}
if (m_ov.hEvent != NULL)
  ResetEvent(m_ov.hEvent);
m_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (m_hWriteEvent != NULL)
  ResetEvent(m_hWriteEvent);
m_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (m_hShutdownEvent != NULL)
  ResetEvent(m_hShutdownEvent);
m_hShutdownEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
m_hEventArray[0] = m_hShutdownEvent;
m_hEventArray[1] = m_ov.hEvent;
m_hEventArray[2] = m_hWriteEvent;
m_pOwner = pPortOwner;
if (m_szWriteBuffer != NULL)
  delete []m_szWriteBuffer;
m_szWriteBuffer = new char[writebuffersize];
m_nPortNr = portnr;
m_nWriteBufferSize = writebuffersize;
m_dwCommEvents = dwCommEvents;
EnterCriticalSection(&m_csCommunicationSync);
if (m_hComm != NULL)
{
  CloseHandle(m_hComm);
  m_hComm = NULL;
}
sprintf(szPort, "COM%d", portnr);
sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity,
  databits, stopbits);
m_hComm = CreateFile
(
  szPort,
  GENERICes_READ | GENERIC_WRITE,
  0,
  NULL,
  OPEN_EXISTING,
  FILE_FLAG_OVERLAPPED,
  0
);
m_CommTimeouts.ReadIntervalTimeout = 1000;
m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000;
m_CommTimeouts.ReadTotalTimeoutConstant = 1000;
m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000;
m_CommTimeouts.WriteTotalTimeoutConstant = 1000;
if (SetCommTimeouts(m_hComm, &m_CommTimeouts))
{
  if (SetCommMask(m_hComm, dwCommEvents))
  {
    if (GetCommState(m_hComm, &m_dcb))
    {
      m_dcb.fRtsControl = RTS_CONTROL_ENABLE;
      if (BuildCommDCB(szBaud, &m_dcb))
      {
        if (SetCommState(m_hComm, &m_dcb))
        else
          ProcessErrorMessage("SetCommState()");
      }
      else
        ProcessErrorMessage("BuildCommDCB()");
    }
    else
      ProcessErrorMessage("GetCommState()");
  }
  else
    ProcessErrorMessage("SetCommMask()");
  else
    ProcessErrorMessage("SetCommTimeouts()");
  delete []szPort;
  delete []szBaud PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR
    | PURGE_RXABORT | PURGE_TXABORT);
  LeaveCriticalSection(&m_csCommunicationSync);
  TRACE(
    "Initial isation for communicationport %d completed.\nUse Startmonitor to communicate. \n", portnr);
if (!(m_Thread = AfxBeginThread(CommThread, this)))
  return FALSE;
TRACE("Thread started\n");
TRACE("Thread resumed\n");
m_Thread->ResumeThread();
FormatMessage
(
  FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
  NULL,
  GetLastError(),
  MAKELANGID
  (LANGesNEUTRAL, SUBLANG_DEFAULT),
  (LPTSTR) &1pMsgBuf,
  0,
  NULL
);
sprintf(Temp,
  "WARNING: %s Failed with the following error: \n%s\nPort:%d\n",
  (char*)ErrorText, 1pMsgBuf, m_nPortNr);
MessageBox(NULL, Temp, "Application Error", MB_ICONSTOP);
ResetEvent(port->m_hWriteEvent);
EnterCriticalSection(&port->m_csCommunicationSync);
if (bWrite)
{
  port->m_ov.Ofset = 0;
  port->m_ov.OffsetHigh = 0;
  PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_RXABORT |
    PURGE_TXABORT);
  bResult = WriteFile(port->m_hComm, port->m_szWriteBuffer, strlen
    ((char*)port->m_szWriteBuffer), &BytesSent, &port->m_ov);
  if (!bResult)
  {
    DWORD dwError = GetLastError();
    switch (dwError)
    {
      case ERROR_IO_PENDING:
        {
          BytesSent = 0;
          Write = FALSE;
          break;
        }
      default:
        {
          port->ProcessErrorMessage("WriteFile()");
        }
    }
  }
  else
  {
    LeaveCriticalSection(&port->m_csCommunicationSync);
  }
}

if (!bWrite)
{
  bWrite = TRUE;
  bResult = GetOverlappedResult(port->m_hComm, &port->m_ov,
    &BytesSent, TRUE);
  LeaveCriticalSection(&port->m_csCommunicationSync);
  if (!bResult)
  {
    port->ProcessErrorMessage(
      "GetOverlappedResults() in WriteFile()");
  }
}

if (BytesSent != strlen((char*)port->m_szWriteBuffer))
{
  TRACE(
    "WARNING: WriteFileQ error.. Bytes Sent: %d; Message Length: % d  \     n      ", BytesSent, strlen((char*)port->m_szWriteBuffer));
}

assert(m_hComm != 0);
memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
strcpy(m_szWriteBuffer, string);
SetEvent(m_hWriteEvent);
CCommtestDlg dlg;
m_pMainWnd = &dlg;
dlg.DoModal();