SI_COMM is not just for Visual Basic developers, Visual C++ developers can use it as well. SI_COMM comes complete with an MFC integration class that allows you to easily add SI_COMM to your MFC applications. All of SI_COMM's properties, methods, and events are accessible to you without having to write any supporting code to do it.

The following code is from an example program included with SI_COMM. The program is a simple break out monitor that displays the state of the modem signals RI, CTS, DCD, and DSR. Shown below is the compiled program running under Windows 95.

/************************************************************************
BreakOutBox.cpp
SI_COMM.OCX Copyright (C) 1998 Software Innovations Inc All rights reserved. Description:
MFC Example Code for SI_COMM OCX.
************************************************************************/
#include <afxwin.h>
#include <afxdisp.h >
#include "..\..\INC\SiCommCtrl.h"
#include "BreakOutBox.h"
#include "resource.h"

CBreakOutBoxApp objApp;
/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
BOOL CBreakOutBoxApp::InitInstance() {

    AfxEnableControlContainer();
    m_pMainWnd = new CBreakOutWindow;
    m_pMainWnd->CenterWindow(NULL);
    m_pMainWnd->SetIcon(LoadIcon(IDI_APPICON),FALSE);
    m_pMainWnd->ShowWindow(m_nCmdShow);
    m_pMainWnd->UpdateWindow();
    return TRUE;
}

BEGIN_MESSAGE_MAP(CBreakOutWindow,CFrameWnd)
   ON_WM_PAINT()
   ON_WM_DESTROY()
   ON_WM_CREATE()
END_MESSAGE_MAP()

BEGIN_EVENTSINK_MAP(CBreakOutWindow, CFrameWnd)
   ON_EVENT(CBreakOutWindow,100,1,CommEvent,VTS_I2)
END_EVENTSINK_MAP()

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
CBreakOutWindow::CBreakOutWindow() {

   m_sDcd = "DCD";
   m_sDsr = "DSR";
   m_sRi = "RI";
   m_sCts = "CTS";

   Create(NULL,"RS232 Break OutBox",WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX,
      CRect(0,0,225,150));
}

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
int CBreakOutWindow::OnCreate( LPCREATESTRUCT lpCreateStruct ) {

   TEXTMETRIC tm;
   CClientDC *dc;

   if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1;
   if (!objSiComm.Create(this,100)) AfxThrowResourceException();

// Set the Delta DCD,DSR,CTS, and RI events..
   objSiComm.SetDeltaDCD(TRUE);
   objSiComm.SetDeltaDSR(TRUE);
   objSiComm.SetDeltaCTS(TRUE);
   objSiComm.SetDeltaRI(TRUE);
   objSiComm.SetPortNumber(COMM1);
   objSiComm.SetPortOpen(TRUE);

   dc = new CClientDC( this );
   dc->GetTextMetrics(&tm);
   m_cxChar = tm.tmAveCharWidth;
   m_cyChar = tm.tmHeight;

   delete dc;
   return 0;
}

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
void CBreakOutWindow::OnDestroy( void ) {

   objSiComm.SetPortOpen(FALSE);
}

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
void CBreakOutWindow::OnPaint( void ) {

   CPaintDC dc( this );
   int x1,x2,y1,y2;

   x1 = 3 * m_cxChar;
   x2 = 16 * m_cxChar;
   y1 = m_cyChar;
   y2 = 4 * m_cyChar;

   dc.TextOut(x1,y1,m_sDcd,m_sDcd.GetLength());
   dc.TextOut(x1,y2,m_sDsr,m_sDsr.GetLength());

   dc.TextOut(x2,y1,m_sCts,m_sCts.GetLength());
   dc.TextOut(x2,y2,m_sRi,m_sRi.GetLength());

   DrawDiode(x1 + (5*m_cxChar),y1 + 2,objSiComm.GetDCD(),dc);
   DrawDiode(x1 + (5*m_cxChar),y2 + 2,objSiComm.GetDSR(),dc);
   DrawDiode(x2 + (5*m_cxChar),y1 + 2,objSiComm.GetCTS(),dc);
   DrawDiode(x2 + (5*m_cxChar),y2 + 2,objSiComm.GetRI(),dc);

}

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
void CBreakOutWindow :: DrawDiode( int x, int y, BOOL on,CPaintDC &dc) {

   CBrush *pOldBrush;
   CBrush greenBrush(RGB(0,255,0));
   CBrush blackBrush(RGB(0,0,0));
   CRect rect;

   pOldBrush = dc.GetCurrentBrush();

   rect.top = y;
   rect.left = x;
   rect.bottom = rect.top + 12;
   rect.right = rect.left + 12;

   if (on)
      dc.SelectObject(&greenBrush);
   else
      dc.SelectObject(&blackBrush);

   dc.Ellipse(&rect);

   dc.SelectObject(pOldBrush);

}

/*----------------------------------------------------------------------
-----------------------------------------------------------------------*/
BOOL CBreakOutWindow::CommEvent( unsigned short iEvent) {

Invalidate(FALSE);
return TRUE;

}

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Copyright © 2008 Software Innovations, Inc.
Last modified: 05/03/08