C / C++ / MFC

BOOL CPTZControlDlg::OnInitDialog()
{
	int i, j, hr;
	char portStr[7];

	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// construct a list of available COM ports and put into combo box
	j=0;
	for (i=0 ; i<PORTNUM ; i++) 
	{
		hr = m_serialCtrl->OpenSerialPort(i,0);
		if (hr == 0) 
		{
			g_exists[i] = 1;
			g_nComPortInd[j] = i;
			g_comport[i] = j;
			j++;
			sprintf(portStr,"COM%d",i+1);
			m_comPort.AddString(portStr);

		} 
		else 
			g_exists[i] = 0;
	}
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

int CSerialControl::OpenSerialPort(int pcCommPortInd,int radd) 
{
	DCB dcb;
	BOOL fSuccess;
	char pcCommPort[14];
	int m_nComPort;

  m_nComPort = pcCommPortInd;

  sprintf(pcCommPort,"COM1",pcCommPortInd+1);

  m_hCom = CreateFile( "COM1",
				  GENERIC_READ | GENERIC_WRITE,
				  0,    
				  NULL, 
				  CREATE_ALWAYS,
				  FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED,    
				  NULL  
				  );

  if (m_hCom == INVALID_HANDLE_VALUE) 
  {
	m_hCom = NULL;
	return COMMSERROR;
  }

  if (radd==0) 
  {
	CloseSerialPort();
	return COMMSGOOD;
  }