MFC

Local

• ActiveX, embedding in SDI window
• Command line parsing
• Console
• Dialog, Resizing
• Getting a HWND
• Replacing The Default Icon
• Status Bar
• SubWindow in an SDI MFC App
• Timer
• Window, Disabling Clear
• Window, desktop
• Window, setting the Initial Size
• Window Title, How to Set

External

• MFC Tips and Tricks

Command line parsing

Handle command line arguments in a class derived from CCommandLineInfo. Example:

Make sure that InitInstance has lines like this in it:

Dialog, Resizing

Resizing Controls

ActiveX, embedding in SDI window

Junky Notes...

NON doc / view version

Doc / View version

Window, Disabling Clear

• Add a WM_ERASEBKGND handler
• do not call the parent clear, only return true

Window, desktop

// getting the window
CWnd *pCwnd = CWnd::GetDesktopWindow();

// getting a drawing context to draw to it
CWindowDC wdc( CWnd::GetDesktopWindow());

Timer

Associated with a window

Add a WM_TIMER event handler

class XxxDlg {
…
UINT m_nTimerId;
UINT m_nEventId;

static void CALLBACK MyTimerProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime);

void OnStart();
void OnStop();
…
};

void XxxDlg::OnStart() 
{
	m_nEventId = 1;
	m_nTimerId = SetTimer(m_nEventId, m_nElapse, NULL);
}

void XxxDlg::OnStop() 
{
	if (m_nTimerId != 0) {
		// EventId is used instead of the TimerId 
		KillTimer(m_nEventId);
		m_nTimerId = 0;
	}
}

// Following is an IDE generated method:
void XxxDlg::OnTimer(UINT nIDEvent)
{
	CFrameWnd::OnTimer(nIDEvent);
	
	// do whatever here
}

Not assocated with a window

class XxxDlg {
…
UINT m_nTimerId;
UINT m_nEventId;

static void CALLBACK MyTimerProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime);

void OnStart();
void OnStop();
…
};

void CALLBACK XxxDlg::MyTimerProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
{   
  // Handle your timer here (timerID in idEvent)}

  // Do specific task
  Beep(3000, 100); 
}

void XxxDlg::OnStart() 
{
	// TODO: Add your control notification handler code here
	UINT nElapse; // Specifies the time-out value, in milliseconds
	
	nElapse = 500; 
	
	// EventId (2nd parameter) is ignored.
	m_nTimerId = ::SetTimer(NULL, 0, nElapse, MyTimerProc);
}

void XxxDlg::OnStop() 
{
	// TODO: Add your control notification handler code here
	
	if (m_nTimerId != 0) {
		::KillTimer(NULL, m_nTimerId);
		m_nTimerId = 0;
	}	
}

Window, setting the Initial Size

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs) 
{ 
    // Create a window without min/max buttons or sizable border 
    cs.style = WS_OVERLAPPED | WS_SYSMENU | WS_BORDER;

    // Size the window to 1/3 screen size and center it 
    cs.cy = ::GetSystemMetrics(SM_CYSCREEN) / 3; 
    cs.cx = ::GetSystemMetrics(SM_CXSCREEN) / 3; 
    cs.y = ((cs.cy * 3) - cs.cy) / 2; 
    cs.x = ((cs.cx * 3) - cs.cx) / 2;

    // Call the base-class version
    return CFrameWnd::PreCreateWindow(cs); 
}

Replacing The Default Icon

How to Set the Window Title

AfxGetApp()->GetMainWnd()->SetWindowText( "New Window Title");

Status Bar

// In CMainFrm
this->m_wndStatusBar.SetWindowText( "Show Me");

// From elsewhere
// add this to CMainFrm
void CMainFrm::SetStatusText( LPCTSTR str) { m_wndStatusBar.SetWindowText( str); }
// then use this to set it:
CMainFrame* pFrame =(CMainFrame*) AfxGetApp()->m_pMainWnd;
pFrame->SetStatusText( "Show Me Too");

SubWindow in an SDI MFC App

1. Create an MFC sdi application
2. Add an MFC class with base class CWnd
3. Add an instance of your new class to ChildView.h
4. To ChildView::OnCreate add this:

   	CRect rect( 0, 0, 10, 10);
   	if ( !m_wndGlx.Create( NULL, NULL, AFX_WS_DEFAULT_VIEW, rect, this, AFX_IDW_PANE_FIRST, NULL)) {
   		int y = 0;
   	}	
   

5. To ChildView::OnSize add a call to {new window}.MoveWindow( 0, 0, cx, cy);
6. Do whatever you want in the new windows OnPaint
7. If you want to get Commands to your new window (like Menu Selections), Look at how the MainFrames OnCmdMsg handler chains to its ChildView and add a OnCmdMsg handler to the child view and make it chain to the sub window you added

Getting a HWND

From CDialog

dialog.GetSafeHWD();

From A Resource Identifier

HWND hWnd = GetDlgItem(IDC_CUSTOM1)->GetSafeHwnd();

Console

AllocConsole();
GetStdHandle( STD_OUTPUT_HANDLE);
WriteConsole(