C++ 用MFC做了一个屏保程序 没有错误 但是闪退

[at879520552]

来po一下程序

ScreenWnd.h
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, DWORD 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 OnMouseMove(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)
		//注册窗口类
		lpszClassName = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW,
			AfxGetApp()->LoadCursor(IDC_CURSOR),
			//光标为自定义光标
			CreateSolidBrush(RGB(0, 0, 0)));
	//窗体背景颜色为黑色
	CRect rc;
	GetDesktopWindow()->GetClientRect(rc);
	//获取屏幕位置大小信息
	if (!CreateEx(WS_EX_TOPMOST, lpszClassName, _T(""), WS_POPUP | WS_VISIBLE | WS_MAXIMIZE, rc, AfxGetMainWnd(), 0))
		//创建能够覆盖整个屏幕的窗体
		PostMessage(WM_CLOSE);
	//创建失败则结束应用程序
	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 default
	CClientDC dc(this);
	SetTimer(1, 1000, NULL);
	CWnd::OnTimer(nIDEvent);
}


void CScreenWnd::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	CRect rect;
	GetClientRect(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(&myFont);
	dc.SetTextColor(RGB(abs(rand()) % 256, abs(rand()) % 256, abs(rand()) % 256));
	dc.SetBkColor(RGB(0, 0, 0));
	CString str("My ScreenSaves!");
	dc.ExtTextOut(rect.Width()/2-str.GetLength()*10, rect.Height()/8*3, ETO_OPAQUE, NULL, str, NULL);
	dc.SelectObject(pOldFont);				   // TODO: Add your message handler code here
					   // Do not call CWnd::OnPaint() for painting messages
}


void CScreenWnd::OnClose()
{
	// TODO: Add your message handler code here and/or call default
	KillTimer(1);
	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, DWORD dwThreadID)
{
	
	if(!bActive)
		PostMessage(WM_CLOSE);
	// TODO: Add your message handler code here
	CWnd::OnActivateApp(bActive, dwThreadID);
}


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


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


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


void CScreenWnd::OnMouseMove(UINT nFlags, CPoint point)
{
	// TODO: Add your message handler code here and/or call default
	static CPoint staticPoint(-1, -1);
	CPoint temp(-1, -1);
	if (temp != staticPoint)
		PostMessage(WM_CLOSE);
	else staticPoint = point;
	CWnd::OnMouseMove(nFlags, point);

}


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


void CScreenWnd::OnSysKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// TODO: Add your message handler code here and/or call default
	PostMessage(WM_CLOSE);
	CWnd::OnSysKeyDown(nChar, nRepCnt, nFlags);
}




MyScreenSave.h

#pragma once
#include "stdafx.h"
#ifndef __AFXWIN_H__
#endif

#include "resource.h"		// 主符号
#include "ScreenWnd.h"

// CMyScreenSaveApp: 
// 有关此类的实现，请参阅 MyScreenSave.cpp
//

class CMyScreenSaveApp : public CWinApp
{
public:
	CMyScreenSaveApp();

	// Overrides
public:
	virtual BOOL InitInstance();

	// Implementation

	DECLARE_MESSAGE_MAP()

private:
	CScreenWnd* m_pScrWnd;
public:
	virtual int ExitInstance();
};

extern CMyScreenSaveApp theApp;





MyScreenSave.cpp

#include "stdafx.h"
#include "MyScreenSave.h"
#include "MyScreenSaveDlg.h"

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


// CMyScreenSaveApp


BEGIN_MESSAGE_MAP(CMyScreenSaveApp, CWinApp)
	ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()


// CMyScreenSaveApp 构造

CMyScreenSaveApp::CMyScreenSaveApp()
{
	// 支持重新启动管理器
	//m_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_RESTART;

	// TODO: 在此处添加构造代码，
	// 将所有重要的初始化放置在 InitInstance 中
}


// 唯一的一个 CMyScreenSaveApp 对象

CMyScreenSaveApp theApp;

// CMyScreenSaveApp 初始化
BOOL CMyScreenSaveApp::InitInstance()
{
	AfxEnableControlContainer();
	//Standard initialization 
	//If you are not using these features and wish to reduce the size 
	//of your final executable, you should remove from the following 
	//the specific initialization routines you do not need.
	//创建全屏窗体实例

	CScreenWnd *pWnd = new CScreenWnd();
    m_pScrWnd = pWnd;
	m_pMainWnd = pWnd; 
    pWnd->CreateScreenWnd();
	return TRUE;

}

int CMyScreenSaveApp::ExitInstance()
{
	if (m_pScrWnd)
		delete m_pScrWnd;
	return CWinApp::ExitInstance();
}

我设置了几个断点，调试时是这样的：









再看一下Debug吧

[赵4老师]

在MSDN里面搜“ScrnSave”

[赵4老师]

"screen saver"

[yuanningcz]

你这个东西太简单了，只是方法用错了。 给你说一个最简单的方法： 一、做个MFC程序，拖一个pic控件，然后把要显示的图片丢到控件里显示。 二、把pic控件全屏。 三、现在屏幕操作有现成的类，你自己最好先用别人的，等水平到了一定程度了，再来自己写。给你个类的地址 http://www.pudn.com/downloads180/sourcecode/graph/detail837148.html

[at879520552]

引用 2 楼 zhao4zhong1 的回复:

"screen saver"

查了干什么呢

[赵4老师]

引用 4 楼 at879520552 的回复:

[quote=引用 2 楼 zhao4zhong1 的回复:] "screen saver"

查了干什么呢[/quote] 看人家的例子代码怎么做的啊！