ScreenWnd. HThe class CScreenWnd: 
Public CWnd 
{
Public: 

CScreenWnd (); 
~ CScreenWnd (); 
Private: 
LPCTSTR lpszClassName; 
Public: 
BOOL CreateScreenWnd (); 
DECLARE_MESSAGE_MAP () 
Afx_msg void OnTimer (UINT_PTR nIDEvent); 
Afx_msg void OnPaint (); 
Afx_msg void OnClose (); 
Afx_msg void OnActivate (UINT nState, CWnd * pWndOther, BOOL bMinimized); 
Afx_msg void OnActivateApp (BOOL bActive, dwords dwThreadID); 
Afx_msg void OnLButtonDown (UINT nFlags, CPoint point); 
Afx_msg void OnMButtonDown (UINT nFlags, CPoint point); 
Afx_msg void OnRButtonDown (UINT nFlags, CPoint point); 
Afx_msg void onm ouseMove (UINT nFlags, CPoint point); 
Afx_msg void OnKeyDown (UINT nChar, UINT nRepCnt, UINT nFlags); 
Afx_msg void OnSysKeyDown (UINT nChar, UINT nRepCnt, UINT nFlags); 
}; 


ScreenWnd. CPP 
# include "stdafx. H" 
# include "ScreenWnd. H" 


CScreenWnd: : CScreenWnd () 
{
LpszClassName=NULL; 
} 


CScreenWnd: : ~ CScreenWnd () 
{
} 

BOOL CScreenWnd: : CreateScreenWnd () 
{
//TODO: Add yourspecialized code here and/or call the base class 
if (! LpszClassName) 
//registered window class 
LpszClassName=AfxRegisterWndClass (CS_HREDRAW | CS_VREDRAW, 
AfxGetApp () - & gt; LoadCursor (IDC_CURSOR), 
//the cursor for custom cursor 
CreateSolidBrush (RGB (0, 0, 0))); 
//form the background color to black 
CRect rc; 
The GetDesktopWindow () - & gt; GetClientRect (rc); 
//screen position and size information 
if (! CreateEx (WS_EX_TOPMOST lpszClassName, _T (" "), WS_POPUP | WS_VISIBLE | WS_MAXIMIZE, rc, AfxGetMainWnd (), 0)) 
//create forms that covers the entire screen 
PostMessage (WM_CLOSE); 
//create a failure is to end the application 
Return TRUE; 
} 
BEGIN_MESSAGE_MAP (CScreenWnd, CWnd) 
ON_WM_TIMER () 
ON_WM_PAINT () 
ON_WM_CLOSE () 
ON_WM_ACTIVATE () 
ON_WM_ACTIVATEAPP () 
ON_WM_LBUTTONDOWN () 
ON_WM_MBUTTONDOWN () 
ON_WM_RBUTTONDOWN () 
ON_WM_MOUSEMOVE () 
ON_WM_KEYDOWN () 
ON_WM_SYSKEYDOWN () 
END_MESSAGE_MAP () 
Void CScreenWnd: : OnTimer (UINT_PTR nIDEvent) 
{
//TODO: Add your message handler code here and/or call the default 
CClientDC dc (this); 
The SetTimer (1, 1000, NULL); 
The CWnd: : OnTimer (nIDEvent); 
} 


Void CScreenWnd: : OnPaint () 
{
CPaintDC dc (this);//device context for painting 
CRect the rect. 
GetClientRect (the rect); 
CFont myFont; 
MyFont. CreateFont (56, 20, 0, 0, FW_BOLD, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, L "Verdana"); 
CFont * pOldFont=dc. SelectObject (& amp; MyFont); 
Dc. SetTextColor (RGB (abs (rand ()) % 256, abs (rand ()) % 256, abs (rand ()) % 256)); 
Dc. SetBkColor (RGB (0, 0, 0)); 
Cstrings STR (" My ScreenSaves!" ); 
Dc. ExtTextOut (the rect. Width ()/2 - STR. GetLength () * 10, the rect. Height ()/8 * 3, ETO_OPAQUE, NULL, STR, NULL); 
Dc. SelectObject (pOldFont);//TODO: Add your message handler code here 
//the Do not call CWnd: : OnPaint () for painting the messages 
} 


Void CScreenWnd: : OnClose () 
{
//TODO: Add your message handler code here and/or call the default 
KillTimer (1); 
The CWnd: : OnClose (); 
} 


Void CScreenWnd: : OnActivate (UINT nState, CWnd * pWndOther, BOOL bMinimized) 
{

If (nState==WA_INACTIVE) 
PostMessage (WM_CLOSE); 
//TODO: Add your message handler code here 
CWnd: : OnActivate (nState pWndOther, bMinimized); 
} 


Void CScreenWnd: : OnActivateApp (BOOL bActive, dwords dwThreadID) 
{

if(! BActive) 
PostMessage (WM_CLOSE); 
//TODO: Add your message handler code here 
The CWnd: : OnActivateApp (bActive dwThreadID); 
} 


Void CScreenWnd: : OnLButtonDown (UINT nFlags, CPoint point) 
{
//TODO: Add your message handler code here and/or call the default 
PostMessage (WM_CLOSE); 
The CWnd: : OnLButtonDown (nFlags, point); 
} 


Void CScreenWnd: : OnRButtonDown (UINT nFlags, CPoint point) 
{
//TODO: Add your message handler code here and/or call the default 
PostMessage (WM_CLOSE); 
The CWnd: : OnRButtonDown (nFlags, point); 
} 


Void CScreenWnd: : OnMButtonDown (UINT nFlags, CPoint point) 
{
//TODO: Add your message handler code here and/or call the default 
PostMessage (WM_CLOSE); 
The CWnd: : OnMButtonDown (nFlags, point); 
} 


Void CScreenWnd: : onm ouseMove (UINT nFlags, CPoint point) 
{
//TODO: Add your message handler code here and/or call the default 
The static CPoint staticPoint (1, 1); 
CPoint temp (1, 1); 
If (temp!=staticPoint) 
PostMessage (WM_CLOSE); 
The else staticPoint=point; 
The CWnd: : onm ouseMove (nFlags, point); 

} 


Void CScreenWnd: : OnKeyDown (UINT nChar, UINT nRepCnt, UINT nFlags) 
{
//TODO: Add your message handler code here and/or call the default 
PostMessage (WM_CLOSE); 
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