VC启动窗口画面制作方法研究

VC启动窗口画面制作方法研究

源代码运行效果图如下：


1. 概述

前几天在设计软件时，选择VC作为开发工具，想做个启动画面，由于以前没有制作过，所以到网上搜了一通。网上有几篇相关文章，有两篇我觉得很有价值：一篇是关于 为方便显示图像制作的CPicture类的文章，原文是由Paul DiLascia写的解答，很有影响力；还有一篇是关于制作真彩启动画面的文章，不过其限制对位图操作，而不支持jpg, gif，而且使用繁琐，基本上是对Splash Screen组件导入后的代码进行简单修改。琢磨了好大一会儿才学会使用。

有感于现有材料使用起来不方便，随进行了整合和再封装处理,设计了CSplashWnd类，使用起来非常简便。下面就把我设计的类介绍给大家。有什么不当或错误之处，敬请指正。我的Email: zhengxiliu@sohu.com

2．CSplashWnd功能

能够显示真彩启动画面，能在画面上显示初始化文字信息，支持jpg,gif,bmp图像文件。

3. CSplashWnd的设计

3.1 用户关心的接口

用户使用的公开接口：

public: CSplashWnd(LPCTSTR lpszFileName);// 指定作为启动画面的图像文件,并装载 BOOL ShowSplash();//显示画面 void CloseSplash();//关闭画面 void ShowText(LPCTSTR pCh);在显示的图像上中间位置处显示初始化信息文字

3.2 其他接口
系统使用的公开接口：(用户不关心)

~CSplashWnd() void PostNcDestroy();

私有接口：(用户不关心)

BOOL Create(CWnd* pParentWnd = NULL); int OnCreate(LPCREATESTRUCT lpCreateStruct); void OnPaint();

3.3 数据设计(用户不关心)

BOOL fileIsValid//指示 CPicture pic;//用于对图像文件进行操作的类 int width,height;

3.4 限制

√ 不允许继承。
√ 为简化接口，只提供从文件装载图像

3.5 需要的头文件

StdAfx.h, VC++6.0自动生成的对MFC的支持，不同的工程选项会产生不同的StdAfx.h。

afxwin.h 支持CRect类

atlbase.h 提供对IPicture （COM类）的支持。

afxpriv2.h提供对CArchiveStream类的支持。

4.类的健壮性和可调试性设计

图像文件是否有效?

需要检查文件是否有效，当装载图像文件失败时，fileIsValid为false，否则为true。这样在调用ShowSplash时将什么都不做，返回false。这时，用户应检查图像文件是否存在，文件名称拼写是否正确。

5. 用法

√ 将CSplashWnd类加入项目中

√ 在使用CSplashWnd类的文件中#include “Splash.h”

√ 在合适的位置定义一个CSplashWnd对象

√ 在想显示启动画面的地方调用ShowSplash显示于屏幕上

√ 如果想在启动画面上显示一些初始化或其他提示信息，调用ShowText。

√ 在你想关闭启动画面的地方

在你的App类InitInstance函数中,显示主窗口之前使用，进行上述步骤，这是最典型的用法，如下面代码所示。

BOOL CTsApp::InitInstance() {AfxEnableControlContainer();#ifdef _AFXDLLEnable3dControls(); // Call this when using MFC in a shared DLL #elseEnable3dControlsStatic(); // Call this when linking to MFC statically #endifSetRegistryKey(_T("Local AppWizard-Generated Applications"));LoadStdProfileSettings(); // Load standard INI file options (including MRU)CSingleDocTemplate* pDocTemplate;pDocTemplate = new CSingleDocTemplate(IDR_MAINFRAME,RUNTIME_CLASS(CTsDoc),RUNTIME_CLASS(CMainFrame), // main SDI frame windowRUNTIME_CLASS(CTsView));AddDocTemplate(pDocTemplate);CCommandLineInfo cmdInfo;ParseCommandLine(cmdInfo);if (!ProcessShellCommand(cmdInfo))return FALSE;/CSplashWnd* pCsw = new CSplashWnd("fx.jpg");//located in the local directory,or else full-path file name is neededpCsw->ShowSplash();Sleep(750);//delay some time to observe the image displayed.pCsw->CloseSplash();delete pCsw;pCsw = NULL; /// The one and only window has been initialized, so show and update it.m_pMainWnd->ShowWindow(SW_SHOW);m_pMainWnd->UpdateWindow();return TRUE; }

6. 类代码

6.1 Splash.h

/ //Written by Liu Zhengxi //May 5,2003 //Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 // too. /#ifndef _SPLASH #define _SPLASH #include #include // Splash.h : header file /// // Splash Screen class#pragma once/// // Picture object—encapsulates IPicture //Written by Paul DiLascia. //used to display picture //// declare CPicture class //class CPicture { public:BOOL Render(CDC* pDC,CRect rc,LPCRECT prcMFBounds=NULL) const;CPicture();~CPicture();// Load from various resourcesBOOL Load(UINT nIDRes);BOOL Load(LPCTSTR pszPathName);BOOL Load(CFile& file);BOOL Load(CArchive& ar);BOOL Load(IStream* pstm);// render to device contextCSize GetImageSize(CDC* pDC=NULL) const;operator IPicture*() {return m_spIPicture;}void GetHIMETRICSize(OLE_XSIZE_HIMETRIC& cx, OLE_YSIZE_HIMETRIC& cy) const {cx = cy = 0;const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Width(&cx);ASSERT(SUCCEEDED(m_hr));const_cast<CPicture*>(this)->m_hr = m_spIPicture->get_Height(&cy);ASSERT(SUCCEEDED(m_hr));}void Free() {if (m_spIPicture) {m_spIPicture.Release();}}protected:CComQIPtr<IPicture>m_spIPicture; // ATL smart pointer to IPictureHRESULT m_hr; // last error code };/// // //declare CSplashWnd //class CSplashWnd : public CWnd { // Construction public:CSplashWnd(LPCTSTR lpszFileName); // Operations public:BOOL ShowSplash();BOOL PreTranslateAppMessage(MSG* pMsg); void ShowText(LPCTSTR lpStr);void CloseSplash(); // Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CSplashWnd)//}}AFX_VIRTUAL // Implementation public:~CSplashWnd();virtual void PostNcDestroy(); private:BOOL Create(CWnd* pParentWnd = NULL); // Generated message map functions private://{{AFX_MSG(CSplashWnd)afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);afx_msg void OnPaint();//}}AFX_MSGDECLARE_MESSAGE_MAP() private:int height;//the height of the displayed pictureint width;//the width of the displayed pictureCPicture pic;//used to operate the pictureBOOL fileIsValid; };#endif

6.2 Splash.cpp

/// //Written by Liu Zhengxi //May 5,2003 //Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 // too. /// // Splash.cpp : implementation file //#include <atlbase.h> #include <afxwin.h> #include <afxpriv2.h> #include "stdafx.h" // e. g. stdafx.h #include "Splash.h" // e.g. splash.h#ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char BASED_CODE THIS_FILE[] = __FILE__; #endif/ // CSplashWnd class//constructor //Load image from the given file //CSplashWnd::CSplashWnd(LPCTSTR lpszFileName) {fileIsValid = pic.Load(lpszFileName);if(fileIsValid){CSize cz = pic.GetImageSize(NULL);width = cz.cx;height = cz.cy;} }//nothing to do //deconstructor // CSplashWnd::~CSplashWnd() { }//message map //BEGIN_MESSAGE_MAP(CSplashWnd, CWnd)//{{AFX_MSG_MAP(CSplashWnd)ON_WM_CREATE()ON_WM_PAINT()ON_WM_TIMER()//}}AFX_MSG_MAP END_MESSAGE_MAP()//ShowSplash //to display the given image on screen // BOOL CSplashWnd::ShowSplash() {if(fileIsValid){if (!Create(AfxGetMainWnd()))return false;else{UpdateWindow();return true;}}else{return false;} }//PreTranslateAppMessage //BOOL CSplashWnd::PreTranslateAppMessage(MSG* pMsg) {// If we get a keyboard or mouse message, hide the splash screen.if (pMsg->message == WM_KEYDOWN ||pMsg->message == WM_SYSKEYDOWN ||pMsg->message == WM_LBUTTONDOWN ||pMsg->message == WM_RBUTTONDOWN ||pMsg->message == WM_MBUTTONDOWN ||pMsg->message == WM_NCLBUTTONDOWN ||pMsg->message == WM_NCRBUTTONDOWN ||pMsg->message == WM_NCMBUTTONDOWN){CloseSplash();return TRUE; // message handled here}return FALSE; // message not handled }//Create //make a popup splash window //BOOL CSplashWnd::Create(CWnd* pParentWnd /*= NULL*/) {return CreateEx(0,AfxRegisterWndClass(0, AfxGetApp()->LoadStandardCursor(IDC_ARROW)),NULL, WS_POPUP | WS_VISIBLE, 0, 0, width, height, pParentWnd->GetSafeHwnd(), NULL); }//CloseSplash //Quit the splash window //void CSplashWnd::CloseSplash() {// Destroy the window, and update the mainframe.DestroyWindow(); }//do nothing //void CSplashWnd::PostNcDestroy() { }//OnCreate //put the splash window on center //int CSplashWnd::OnCreate(LPCREATESTRUCT lpCreateStruct) {if (CWnd::OnCreate(lpCreateStruct) == -1)return -1;// Center the window.CenterWindow();return 0; }//OnPaint //Display the given image//void CSplashWnd::OnPaint() {CPaintDC dc(this);CRect rc(0,0,0,0);;pic.Render(&dc, rc); }//ShowText //sometimes if we show what we are doing (I display the information on the center of //the picture ), the customer will be more //patient // //void CSplashWnd::ShowText(LPCTSTR lpStr) {Invalidate();CPaintDC dc(this);dc.SetBkMode(TRANSPARENT);SIZE sz;sz = (SIZE)dc.GetTextExtent(lpStr,strlen(lpStr));dc.TextOut((width-sz.cx)/2,height/2,lpStr); }// MSDN Magazine — October 2001 // If this code works, it was written by Paul DiLascia. // If not, I don''t know who wrote it. // Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 // too. // Set tabsize = 3 in your editor. //// CPicture implementation //CPicture::CPicture() { }CPicture::~CPicture() { }// // Load from resource. Looks for "IMAGE" type. //BOOL CPicture::Load(UINT nIDRes) {// find resource in resource fileHINSTANCE hInst = AfxGetResourceHandle();HRSRC hRsrc = ::FindResource(hInst,MAKEINTRESOURCE(nIDRes),"IMAGE"); // typeif (!hRsrc)return FALSE;// load resource into memoryDWORD len = SizeofResource(hInst, hRsrc);BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc);if (!lpRsrc)return FALSE;// create memory file and load itCMemFile file(lpRsrc, len);BOOL bRet = Load(file);FreeResource(hRsrc);return bRet; }// // Load from path name. //BOOL CPicture::Load(LPCTSTR pszPathName) {CFile file;if (!file.Open(pszPathName, CFile::modeRead|CFile::shareDenyWrite))return FALSE;BOOL bRet = Load(file);file.Close();return bRet; }// // Load from CFile //BOOL CPicture::Load(CFile& file) {CArchive ar(&file, CArchive::load | CArchive::bNoFlushOnDelete);return Load(ar); }// // Load from archive—create stream and load from stream. //BOOL CPicture::Load(CArchive& ar) {CArchiveStream arcstream(&ar);return Load((IStream*)&arcstream); }// // Load from stream (IStream). This is the one that really does it: call // OleLoadPicture to do the work. //BOOL CPicture::Load(IStream* pstm) {Free();HRESULT hr = OleLoadPicture(pstm, 0, FALSE,IID_IPicture, (void**)&m_spIPicture);ASSERT(SUCCEEDED(hr) && m_spIPicture); return TRUE; }// // Get image size in pixels. Converts from HIMETRIC to device coords. //CSize CPicture::GetImageSize(CDC* pDC) const {if (!m_spIPicture)return CSize(0,0);LONG hmWidth, hmHeight; // HIMETRIC unitsm_spIPicture->get_Width(&hmWidth);m_spIPicture->get_Height(&hmHeight);CSize sz(hmWidth,hmHeight);if (pDC==NULL) {CWindowDC dc(NULL);dc.HIMETRICtoDP(&sz); // convert to pixels} else {pDC->HIMETRICtoDP(&sz);}return sz; }// // Render to device context. Covert to HIMETRIC for IPicture. //BOOL CPicture::Render(CDC* pDC, CRect rc, LPCRECT prcMFBounds) const {ASSERT(pDC);if (rc.IsRectNull()) {CSize sz = GetImageSize(pDC);rc.right = sz.cx;rc.bottom = sz.cy;}long hmWidth,hmHeight; // HIMETRIC unitsGetHIMETRICSize(hmWidth, hmHeight);m_spIPicture->Render(*pDC, rc.left, rc.top, rc.Width(), rc.Height(),0, hmHeight, hmWidth, -hmHeight, prcMFBounds);return TRUE; }

参考连接：

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