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COM from scratch - PART TWO

, 17 Apr 2004
An article about COM Library.
demoapp.zip
demoappsource.zip
ComDemo
ComDemo.clw
ComDemo.dsp
ComDemo.dsw
Comp1
Comp1.clw
Comp1.def
Comp1.dsp
Comp1.dsw
Debug
icon1.ico
Release
res
Comp2
Comp2.clw
Comp2.def
Comp2.dsp
Comp2.dsw
Debug
Release
res
Comp3
Comp3.clw
Comp3.def
Comp3.dsp
Comp3.dsw
Debug
res
Debug
Release
res
bitmap1.bmp
bitmap2.bmp
bitmap3.bmp
bitmap4.bmp
bitmap5.bmp
bitmap6.bmp
bitmap7.bmp
bitmap8.bmp
bitmap9.bmp
bmp00001.bmp
bmp00002.bmp
bmp00003.bmp
bmp00004.bmp
bmp00005.bmp
bmp00006.bmp
butterfl.ico
com.bmp
ComDemo.ico
ComDemoDoc.ico
ico00001.ico
ico00002.bmp
ico00002.ico
ico00003.ico
ico00004.ico
icon1.ico
Toolbar.bmp
parttwosources.zip
part_two
part_two_client
Debug
part_two_client.dsp
part_two_client.dsw
part_two_component
component.def
Component.dll
MAKEFILE
part_two_improved_client_server
client
client.dsp
client.dsw
Debug
Component
Component.clw
Component.def
Component.dsp
Component.dsw
Debug
Component.dll
res
part_two_rebuildproblem
client
client.dsp
client.dsw
Debug
DLL.dll
DLL
Debug
DLL.dsp
DLL.dsw
// Component1Wnd.cpp : implementation file
//

#include "stdafx.h"
//#include "	\ add additional includes here"
#include "Component1Wnd.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define	WM_RELEASE	(WM_USER+0x500)
/////////////////////////////////////////////////////////////////////////////
// CComponent1Wnd

CComponent1Wnd::CComponent1Wnd():m_pComponent1sIUnknown(NULL),m_nItemID(0)
{
  m_cRef=0;
//Background color for menu when selected with mouse 
	m_color_hittest=4294967295;
//this color will be changed either by the client's view window(OnLeftButtonDown)
//or by the function OnNcLButtonDown
  m_bMenuHasOpend=false;
}

CComponent1Wnd::~CComponent1Wnd()
{
delete this;
}


BEGIN_MESSAGE_MAP(CComponent1Wnd, CWnd)
	//{{AFX_MSG_MAP(CComponent1Wnd)
	ON_WM_MOUSEMOVE()
	ON_WM_MENUSELECT()
	ON_WM_TIMER()
	ON_WM_NCLBUTTONDOWN()
	ON_WM_MOVE()
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
ON_MESSAGE(WM_RELEASE,OnRelease)
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CComponent1Wnd message handlers
void CComponent1Wnd::OnMouseMove(UINT nFlags, CPoint point)
{
    char buf[10];
	CRect rect;
	CDC*  pDC=GetDC();
	GetClientRect (&rect);
	CBrush daybrush;
	CBrush sunsetbrush;
	daybrush.CreateSolidBrush (RGB(0,255,255));
	pDC->FillRect(&rect,&daybrush);
	CClientDC dc(this);
	CBitmap bmp, *poldbmp;
	CDC memdc;
	bmp.LoadBitmap("IDB_SUN" );
	memdc.CreateCompatibleDC( &dc );
	poldbmp = memdc.SelectObject( &bmp );
	dc.BitBlt(point.x,point.y+5, 100, 100, &memdc, 0, 0, SRCCOPY );
	memdc.SelectObject( poldbmp );
	COLORREF currentskycolor=pDC->GetPixel (point);
	
	if((point.y==rect.bottom )|(point.x==rect.right)|(point.x==rect.left ))
	{
		sunsetbrush.CreateSolidBrush(RGB(192,192,192));
		pDC->FillRect(&rect,&sunsetbrush);
		
	}
	GetClientRect (&rect);
	pDC->DrawText(itoa(m_cRef,buf,10),&rect,DT_RIGHT);
	
	CWnd::OnMouseMove(nFlags, point);
}

//---------------------------------------------------------------------------//
// In this function if the left mouse click has been outside of the components
// window and into the client's view window ,the client calls the compoents
// MenuitemNotselected() method and in this method the m_color_hittest will
// be set to white color and menu item selections will not activate Components
// mthods.(Not a good solution, as the menu item will be selected if the
//left mouse click is outside of the client's view window)
///-------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////
void CComponent1Wnd::OnMenuSelect(UINT nItemID, UINT nFlags, HMENU hSysMenu)
{
	
	//Tracking the last selected menu item
	if(nItemID!=0)
		m_nItemID=nItemID;//Geting the lost selected menu item
	// Making sure that menu has been opened
	if((nItemID==32776)||(nItemID==32790))// if((ID_ADDREF) or (ID_NIGHT)) has  selected once
		m_bMenuHasOpend=true;
	
	
	if((nFlags==0xFFFF)&&(hSysMenu==0))//mouse click has been outside of menu
	{
		TRACE(_T("Cliked out side menu\n"));
		SetTimer(1,100,NULL);//seting a timer event and checking which item has been selected lost
	}
	CWnd::OnMenuSelect(nItemID, nFlags, hSysMenu);
}

//////////////////////////////////////////////////////////////
LRESULT CComponent1Wnd::OnRelease(WPARAM wParam,LPARAM lParam)
{
TRACE(_T("RELEASE message is received from CComponent1Wnd::OnRelease \n"));
m_pComponent1sIUnknown->Release();
return 0L;
}

////////////////////////////////////////////
void CComponent1Wnd::OnTimer(UINT nIDEvent)
{
	
	CString str="";
	CStdioFile file;
	KillTimer(nIDEvent);
	
	if((m_color_hittest==4294967295)&&(m_bMenuHasOpend))
	{
		switch(m_nItemID)
		{
			
		    case 32776://ID_ADDREF
				
				TRACE(_T("ADDREF\n"));
				m_pComponent1sIUnknown->AddRef();
				break;
				
			case 32777://ID_RELEASE
				TRACE(_T("RELEASE\n"));
				WindowProc(WM_RELEASE,0,0);// or  m_pComponent1sIUnknown->Release();
			    break;
				
				
			case 32790://ID_NIGHT
				//There is a Timer assosicated with the View class of the client
				//and in OnTimer(...) member function of the View class the value
				//from the file "Com1Notifyclient.txt" will be read and if the value
				//is "1" the client calls the Components Night() method.
				str="1";
				file.Open("C:\\Comp1Notifyclient.txt",CFile::modeWrite|CFile::typeText);
				file.WriteString(str);
				file.Close();
				break;
		}
		
	}
	CWnd::OnTimer(nIDEvent);
}





////////////////////////////////////////////////////////////////
void CComponent1Wnd::OnNcLButtonDown(UINT nHitTest, CPoint point)
{
	
	TRACE(_T("OnNcLButtonDown\n"));
	CDC* pDC=GetDC();
	
	if(m_bMenuHasOpend)
	{
		
		m_bMenuHasOpend=false;
		m_color_hittest=pDC->GetPixel (point);
	}
	
	CWnd::OnNcLButtonDown(nHitTest, point);
}


///////////////////////////////////////////
void CComponent1Wnd::OnMove(int x, int y)
{
	CRect rect;
	CDC*  pDC=GetDC();
	GetClientRect (&rect);
	CPoint point;
	point.x =rect.right/2;
	point.y=rect.bottom /2;
	COLORREF pixelcolor;
	pixelcolor=pDC->GetPixel(point);
	if(pixelcolor!=RGB(192,192,192))
	{
		
		CBrush brush;
		brush.CreateSolidBrush (RGB(0,255,255));
		pDC->FillRect(&rect,&brush);
		CClientDC dc(this);
		CBitmap bmp, *poldbmp;
		CDC memdc;
		bmp.LoadBitmap("IDB_SUN" );
		memdc.CreateCompatibleDC( &dc );
		poldbmp = memdc.SelectObject( &bmp );
		dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
		memdc.SelectObject( poldbmp );
		
	}
	CWnd::OnMove(x, y);
}


void CComponent1Wnd::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CDC* pDC=GetDC();
	m_color_hittest=pDC->GetPixel(point);
	if(m_color_hittest==RGB(0,255,255))
	TRACE(_T("backgraound color\n"));	
	CWnd::OnLButtonDown(nFlags, point);
	
}

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About the Author

Aria Ansari
Software Developer
Denmark Denmark
No Biography provided

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Article Copyright 2004 by Aria Ansari
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