How to trap all windows messages in one place
In this tutorial I will explain how to trap a windows message in one place.

Program
// MainFrm.cpp : implementation of the CMainFrame class
//

#include "stdafx.h"
#include "WindProcTest.h"

#include "MainFrm.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMainFrame

IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd)

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
//{{AFX_MSG_MAP(CMainFrame)
ON_WM_CREATE()
ON_WM_TIMER()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

static UINT indicators[] =
{
ID_SEPARATOR,           // status line indicator
ID_INDICATOR_CAPS,
ID_INDICATOR_NUM,
ID_INDICATOR_SCRL,
};

/////////////////////////////////////////////////////////////////////////////
// CMainFrame construction/destruction

CMainFrame::CMainFrame()
{
// TODO: add member initialization code here
}

CMainFrame::~CMainFrame()
{
}

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
{
TRACE0("Failed to create toolbar ");
return -1;      // fail to create
}

if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
 sizeof(indicators)/sizeof(UINT)))
{
TRACE0("Failed to create status bar ");
return -1;      // fail to create
}

// TODO: Delete these three lines if you don't want the toolbar to
//  be dockable
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockControlBar(&m_wndToolBar);

return 0;
}

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;
// TODO: Modify the Window class or styles here by modifying
//  the CREATESTRUCT cs

return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CMainFrame diagnostics

#ifdef _DEBUG
void CMainFrame::AssertValid() const
{
CFrameWnd::AssertValid();
}

void CMainFrame::Dump(CDumpContext& dc) const
{
CFrameWnd::Dump(dc);
}

#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMainFrame message handlers


LRESULT CMainFrame::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
// TODO: Add your specialized code here and/or call the base class
if(message==WM_LBUTTONDOWN)
{
AfxMessageBox("Left Mouse Clicked From MainFrm");
}
else if(message==WM_KEYDOWN)
{
AfxMessageBox("Key Pressed From MainFrm");
}

else if(message==WM_COMMAND && wParam==ID_APP_ABOUT)
{
AfxMessageBox("Menu Clicked");
}

return CFrameWnd::WindowProc(message, wParam, lParam);
}

void CMainFrame::OnTimer(UINT nIDEvent) 
{
// TODO: Add your message handler code here and/or call default
CFrameWnd::OnTimer(nIDEvent);
}




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