C / C++ / MFC

The Observer pattern addresses the following problems:

    - A one-to-many dependency between objects should be defined without making the objects tightly coupled.
    - It should be ensured that when one object changes state an open-ended number of dependent objects are updated automatically.
    - It should be possible that one object can notify an open-ended number of other objects.

Quantum Robin wrote:

Reference: www.osmosian.com

int CChildFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CMDIChildWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	// TODO: Add your specialized creation code here

	struct tagSIZE butSize,bmpSize;
	bmpSize.cx = 25;bmpSize.cy = 23;butSize.cx = 35;butSize.cy = 30;
	if(iWindowNumber == 4)
	{
		if (!m_wndWindowTool.Create(this,CBRS_TOP|CBRS_TOOLTIPS|CBRS_FLYBY|WS_VISIBLE | CBRS_FLOAT_MULTI) ||
			!m_wndWindowTool.LoadBitmap(IDB_GROUPVW) ||
			!m_wndWindowTool.SetButtons(CtrlGrp,
			sizeof(CtrlGrp)/sizeof(UINT)))
		{
			TRACE0("Failed to create toolbar\n");
			return -1;      
		}
		m_wndWindowTool.SetWindowText("Trend");
		m_wndWindowTool.SetSizes( butSize,bmpSize );
		m_wndWindowTool.SetHeight( 40 );

		
		CRect rect;
		m_wndWindowTool.GetItemRect(0, &rect);
		
		
		m_wndWindowTool.m_Static.IsTitle = true;
		if (!m_wndWindowTool.m_Static.Create("Title",WS_CHILD|WS_VISIBLE|BS_OWNERDRAW,rect, &m_wndWindowTool, IDD_TITLESTATIC) )
		{
			TRACE0("Failed to create combo-box\n");
			return FALSE;
		}
			}
}

Anu_Bala wrote:

In my CChildFrame::OnCreate(), im loading toolbar but it comes only for top view. But i want for bottom view.

BEGIN_MESSAGE_MAP(CSplitFrame, CFrameWnd)
	ON_WM_CREATE()
END_MESSAGE_MAP()

BOOL CSplitFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/, CCreateContext* pContext)
{

	CTrendListView *pview;

	// Create a context.
	CCreateContext context;
	pContext = &context;

	// Assign custom view.
	pContext->m_pNewViewClass = RUNTIME_CLASS(CTrendListView);

	// Create the view.
	pview = (CTrendListView *) CreateView(pContext, AFX_IDW_PANE_FIRST);
	if (pview == NULL)
		return FALSE;

	// Notify the view.
	//pview->SendMessage(WM_INITIALUPDATE);
	SetActiveView(pview, FALSE);

	return TRUE;
}

int CSplitFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
		return -1;

	// TODO:  Add your specialized creation code here
	

	if (!m_wndWindowTool.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
		| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
		!m_wndWindowTool.LoadToolBar(IDR_MAINFRAME))
	{
		TRACE0("Failed to create toolbar\n");
		return -1;      // fail to create
	}

	m_wndWindowTool.EnableDocking(CBRS_ALIGN_ANY);
   m_wndWindowTool.SetBorders(3, 3, 3, 3);
	EnableDocking(CBRS_ALIGN_ANY);
	DockControlBar(&m_wndWindowTool);	
	return 0;

}

if (!m_wndSplitter.CreateStatic(this, 2, 1))
		return FALSE;

	if(!m_wndSplitter.CreateView(0,0, RUNTIME_CLASS(CTrendView),CSize(cr.Width(), cr.Height()-200),pContext)||		
		!m_wndSplitter.CreateView(1,0, RUNTIME_CLASS(CSplitFrame),CSize(cr.Width(), cr.Height()-550),pContext))
	{
		m_wndSplitter.DestroyWindow();
		return FALSE;
	}

if( pTrendDisplayFrame == NULL )
	{
		iWindowNumber = 4;
		CDocTemplate *pTemplate = theApp.pTrendViewTemplate;
		CCS3OprDoc* pDoc = new CCS3OprDoc;
		pTrendDisplayFrame = (CMDIChildWnd *)pTemplate->CreateNewFrame( pDoc ,NULL ); //It shows error in creating new MDIChhildWnd
		if( pTrendDisplayFrame == NULL )
		{
			MessageBox( "Unable to Create Trend Display" );
			return;
		}
		pTemplate->InitialUpdateFrame( pTrendDisplayFrame,NULL );
	}
	else
		MDIActivate( pTrendDisplayFrame );

Anu_Bala wrote:

When i create SplitFrame as MDICHildWnd, it shows assertion error.

class CSplitFrame : public CframeWnd

void CMainFrame::OnTrendview() 
{
	
	if( pTrendDisplayFrame == NULL )
	{
		iWindowNumber = 4;
		CDocTemplate *pTemplate = theApp.pTrendViewTemplate;
		CCS3OprDoc* pDoc = new CCS3OprDoc;
		pTrendDisplayFrame = (CMDIChildWnd *)pTemplate->CreateNewFrame( pDoc ,NULL );
		if( pTrendDisplayFrame == NULL )
		{
			MessageBox( "Unable to Create Trend Display" );
			return;
		}
		pTemplate->InitialUpdateFrame( pTrendDisplayFrame,NULL );
	}
	else
		MDIActivate( pTrendDisplayFrame );
}

// create new from resource
	if (!pFrame->LoadFrame(m_nIDResource,
			WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE,   // default frame styles
			NULL, &context))
	{
		TRACE(traceAppMsg, 0, "Warning: CDocTemplate couldn't create a frame.\n");
		// frame will be deleted in PostNcDestroy cleanup
		return NULL;
	}

class CSplitFrame : public CMDIChildWnd

// walk up two parents for MDIFrame that owns MDIChild (skip MDIClient)
CMDIFrameWnd* CMDIChildWnd::GetMDIFrame()
{
	ASSERT_KINDOF(CMDIChildWnd, this);
	ASSERT(m_hWnd != NULL);
	HWND hWndMDIClient = ::GetParent(m_hWnd);
	ASSERT(hWndMDIClient != NULL);

	CMDIFrameWnd* pMDIFrame;
	pMDIFrame = (CMDIFrameWnd*)CWnd::FromHandle(::GetParent(hWndMDIClient));
	ASSERT(pMDIFrame != NULL);
	ASSERT_KINDOF(CMDIFrameWnd, pMDIFrame); //Assertion error occurred here
	ASSERT(pMDIFrame->m_hWndMDIClient == hWndMDIClient);
	ASSERT_VALID(pMDIFrame);
	return pMDIFrame;
}

class CTrendView : public CView

class CTrendListView : public CView

void CMainFrame::OnTrendListView()
{
	// TODO: Add your command handler code here
	iGraphView = 0;	//Code added by Mohan //Graph view inactive
	if( pTrendListDisplayFrame == NULL )
	{
		iWindowNumber = 11;
		CDocTemplate *pTemplate = theApp.pTrendListViewTemplate;
		CCS3OprDoc* pDoc = new CCS3OprDoc;
		pTrendListDisplayFrame = (CMDIChildWnd *)pTemplate->CreateNewFrame( pDoc ,NULL );
		if( pTrendListDisplayFrame == NULL )
		{
			AfxMessageBox( "Unable to Create Tuning Display" );
			return;
		}
		pTemplate->InitialUpdateFrame( pTrendListDisplayFrame ,NULL );
	}
	else
		MDIActivate( pTrendListDisplayFrame );	

}

--------------
Main menu
--------------
Toolbar
-------------
TrendView
--------------
another toolbar
---------------
TrendListview

Anu_Bala wrote:

Im invoking this TrendListView as follow

C++

void CMainFrame::OnTrendListView()
{
    // TODO: Add your command handler code here
    iGraphView = 0; //Code added by Mohan //Graph view inactive
    if( pTrendListDisplayFrame == NULL )
    {
        iWindowNumber = 11;
        CDocTemplate *pTemplate = theApp.pTrendListViewTemplate;
        CCS3OprDoc* pDoc = new CCS3OprDoc;
        pTrendListDisplayFrame = (CMDIChildWnd *)pTemplate->CreateNewFrame( pDoc ,NULL );
        if( pTrendListDisplayFrame == NULL )
        {
            AfxMessageBox( "Unable to Create Tuning Display" );
            return;
        }
        pTemplate->InitialUpdateFrame( pTrendListDisplayFrame ,NULL );
    }
    else
        MDIActivate( pTrendListDisplayFrame );  

}

Quote:

Are there programmers that are currently using machine code and Assembly?

Quote:

If yes, why?

Quote:

So You Want To Be A Malware Analyst - Malwarebytes Labs | Malwarebytes Labs[^]

In order for a Malware Analyst to be able to read the malware code, they will need to disassemble it. Unfortunately, the highest language derived from binary code is Assembly, which is the last level of human readable code. Therefore, it is imperative that a would-be Malware Analyst, also learn how to read and write Assembly code.

Quote:

1.1 Reasons for using assembly code
Assembly coding is not used as much today as previously. However, there are still reasons
for learning and using assembly code. The main reasons are:

Quote:

If yes, are there many programmers that are currently using machine code and Assembly?

If yes, why?