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COM from scratch - PART TWO

, 17 Apr 2004
An article about COM Library.
demoapp.zip
ComDemo.exe
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
// Component2Wnd.cpp: implementation of the CComponent2Wnd class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"

#include "Component2Wnd.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CComponent2Wnd::CComponent2Wnd():m_pComponent2sIUnknown(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;
    m_bStop=true;//butterfly is not  flying as default
    //SetTimer(2,2000,0);
}

/////////////////////////////////
CComponent2Wnd::~CComponent2Wnd()
{
delete this;
}
BEGIN_MESSAGE_MAP(CComponent2Wnd, CWnd)
	//{{AFX_MSG_MAP(CComponent2Wnd)
	ON_WM_MOVE()
	ON_WM_MOUSEMOVE()
	ON_WM_MENUSELECT()
	ON_WM_NCLBUTTONDOWN()
	ON_WM_TIMER()
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
//////////////////////////////////////////
void CComponent2Wnd::OnMove(int x, int y) 
{
	if(!m_bStop)
	{
        CRect rect;
		CDC*  pDC=GetDC();
		GetClientRect (&rect);
		CBrush brush;
		brush.CreateSolidBrush (RGB(255,255,255));
		pDC->FillRect(&rect,&brush);	
		CClientDC dc(this);
		CBitmap bmp, *poldbmp;
		CDC memdc;
		bmp.LoadBitmap("IDB_BITMAP1" );
  		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 CComponent2Wnd::OnMouseMove(UINT nFlags, CPoint point) 
{

if(m_bStop)//if not flying
	{
	    char buf[10];
		CRect rect;
		CDC*  pDC=GetDC();
		GetClientRect (&rect);
		CBrush brush;
		brush.CreateSolidBrush (RGB(255,255,255));
		pDC->FillRect(&rect,&brush);	
		CClientDC dc(this);
		CBitmap bmp, *poldbmp;
		CDC memdc;
		bmp.LoadBitmap("IDB_BITMAP" );
  		memdc.CreateCompatibleDC( &dc );
		poldbmp = memdc.SelectObject( &bmp );
		dc.BitBlt(point.x,point.y+5, 100, 100, &memdc, 0, 0, SRCCOPY );
		memdc.SelectObject( poldbmp );
		pDC->DrawText(itoa(m_cRef,buf,10),&rect,DT_RIGHT);
		CWnd::OnMouseMove(nFlags, point);
	
	}

 }

////////////////////////////////////////////////////////////////////////////
void CComponent2Wnd::OnMenuSelect(UINT nItemID, UINT nFlags, HMENU hSysMenu)
{
    //Tracking the last selected menu item
    if(nItemID!=0)
        m_nItemID=nItemID;
    
    // Making sure that menu has been opened
    // if((ID_ADDREF2) or (ID_FLY) or (ID_RELEAS2)has been selected once
    if( (nItemID==32791) ||
    (nItemID==32798) ||
    (nItemID==32799) ||
    (nItemID==32792))
    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
    }
    
    
    CWnd::OnMenuSelect(nItemID, nFlags, hSysMenu);
}


/////////////////////////////////////////////////////////////////
void CComponent2Wnd::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 CComponent2Wnd::OnTimer(UINT nIDEvent)
{
	CString str="";
	CStdioFile file;
	static int j=1;
	CBitmap bmp, *poldbmp;
	CDC memdc;
	CRect rect;
	GetClientRect(&rect);
	CClientDC dc(this);
	
	
	if(nIDEvent!=2)
		KillTimer(nIDEvent);
	
	if(m_nItemID==32799)//Notify the client to call the StartFlying() method
	{
		str="1";
		file.Open("C:\\Comp2Notifyclient.txt",CFile::modeWrite|CFile::typeText);
		file.WriteString(str);
		file.Close();
		OnMove(0,0);
	}
	
	if(m_nItemID==32798)//ID_STOPFLY
		m_bStop=true;
	
	
	
	// 4294967295 is the color code for a pixel in a menu item
	if((m_color_hittest==4294967295)&&
	(m_bMenuHasOpend)&&
	(m_bStop)&&
	(nIDEvent==1))
	//if(m_bMenuHasOpend)
	
	{
		
		switch(m_nItemID)
		{
			case 32791://ID_ADDREF2
				TRACE(_T("ADDREF2\n"));
				m_pComponent2sIUnknown->AddRef();
				break;
				
			case 32792://ID_RELEASE2
				TRACE(_T("RELEASE2\n"));
				m_pComponent2sIUnknown->Release();
				break;
				
				
			case 32799://ID_STARTFLY
				m_bStop=false;
				OnMove(0,0);
				break;
				
		}
		m_bMenuHasOpend=false;
		
	}
	
	if((nIDEvent==2)&&(!m_bStop))
		
	{
		switch(j)
		{
			case 1:
				
				bmp.LoadBitmap( "IDB_BITMAP" );
				// Create a compatible memory DC
				memdc.CreateCompatibleDC( &dc );
				// Select the bitmap into the DC
				poldbmp = memdc.SelectObject( &bmp );
				// Copy (BitBlt) bitmap from memory DC to screen DC
				dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
			case 2:
				bmp.LoadBitmap( "IDB_BITMAP2" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt( rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
			case 3:
				bmp.LoadBitmap( "IDB_BITMAP3" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
				
			case 4:
				bmp.LoadBitmap( "IDB_BITMAP4" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt( rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
			case 5:
				bmp.LoadBitmap( "IDB_BITMAP5" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt( rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
				
			case 6:
				bmp.LoadBitmap( "IDB_BITMAP6" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
				
			case 7:
				bmp.LoadBitmap( "IDB_BITMAP7" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
			case 8:
				bmp.LoadBitmap( "IDB_BITMAP8" );
				memdc.CreateCompatibleDC( &dc );
				poldbmp = memdc.SelectObject( &bmp );
				dc.BitBlt(rect.right -100,rect.bottom /4, 100, 100, &memdc, 0, 0, SRCCOPY );
				memdc.SelectObject( poldbmp );
				break;
				
				
		}
		if(j==8)
			j=1;
		j++;
		
	}
	
	CWnd::OnTimer(nIDEvent);
}


void CComponent2Wnd::OnLButtonDown(UINT nFlags, CPoint point) 
{
    CDC* pDC=GetDC();
	m_color_hittest=pDC->GetPixel(point);
	if(m_color_hittest==RGB(0,0,0))
	CWnd::OnLButtonDown(nFlags, point);
}

void CComponent2Wnd::StartTimer()
{
   SetTimer(2,200,0);
}

void CComponent2Wnd::_KillTimer()
{
  KillTimer(2);
}


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About the Author

Aria Ansari
Software Developer
Denmark Denmark
No Biography provided

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