serialwnd.cpp

Alphanumeric messages are encoded in POCSAG format and send to the serial port of a computer. The mo

//	SerialWnd.cpp - Implementation of the CSerialWnd class
//
//	Copyright (C) 1999-2003 Ramon de Klein ([e-mail])
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


//////////////////////////////////////////////////////////////////////
// Include the standard header files
#define STRICT
#include <crtdbg.h>
#include <tchar.h>
#include <windows.h>


//////////////////////////////////////////////////////////////////////
// Include module headerfile

#include "SerialWnd.h"


//////////////////////////////////////////////////////////////////////
// Disable warning C4127: conditional expression is constant, which
// is generated when using the _RPTF and _ASSERTE macros.

#pragma warning(disable: 4127)


//////////////////////////////////////////////////////////////////////
// Enable debug memory manager

#ifdef _DEBUG

#ifdef THIS_FILE
#undef THIS_FILE
#endif

static const char THIS_FILE[] = __FILE__;
#define new DEBUG_NEW

#endif


//////////////////////////////////////////////////////////////////////
// Code

// Register the standard CSerialWnd COM message
const UINT CSerialWnd::mg_nDefaultComMsg = ::RegisterWindowMessage(_T("CSerialWnd_DefaultComMsg"));


CSerialWnd::CSerialWnd()
	: m_hwndDest(0)
	, m_nComMsg(WM_NULL)
	, m_lParam(0)
{
}

CSerialWnd::~CSerialWnd()
{
	// Check if the thread handle is still there. If so, then we
	// didn't close the serial port. We cannot depend on the
	// CSerial destructor, because if it calls Close then it
	// won't call our overridden Close.
	if (m_hThread)
	{
		// Display a warning
		_RPTF0(_CRT_WARN, "CSerialWnd::~CSerialWnd - Serial port not closed\n");

		// Close implicitly
		Close();
	}
}

LONG CSerialWnd::Open (LPCTSTR lpszDevice, HWND hwndDest, UINT nComMsg, LPARAM lParam, DWORD dwInQueue, DWORD dwOutQueue)
{
	// Call the base class first
	long lLastError = CSerialEx::Open(lpszDevice,dwInQueue,dwOutQueue);
	if (lLastError != ERROR_SUCCESS)
		return lLastError;

	// Save the window handle, notification message and user message
	m_hwndDest = hwndDest;
	m_nComMsg  = nComMsg?nComMsg:mg_nDefaultComMsg;
	m_lParam   = lParam;

	// Start the listener thread
	lLastError = StartListener();
	if (lLastError != ERROR_SUCCESS)
	{
		// Close the serial port
		Close();

		// Return the error-code
		m_lLastError = lLastError;
		return m_lLastError;
	}

	// Return the error
	m_lLastError = ERROR_SUCCESS;
	return m_lLastError;
}

LONG CSerialWnd::Close (void)
{
	// Reset all members
	m_hwndDest   = 0;
	m_nComMsg    = WM_NULL;

	// Call the base class
	return CSerialEx::Close();
}

void CSerialWnd::OnEvent (EEvent eEvent, EError eError)
{
	// Post message to the client window
	::PostMessage(m_hwndDest,m_nComMsg,MAKEWPARAM(eEvent,eError),LPARAM(m_lParam));
}