源代碼運行效果圖如下：
1. 概述
前幾天在設計軟件時，選擇VC作為開發工具，想做個啟動畫面，由於以前沒有制作過，所以到網上搜了一通。網上有幾篇相關文章，有兩篇我覺得很有價值：一篇是關於 為方便顯示圖像制作的CPicture類的文章，原文是由Paul DiLascia寫的解答，很有影響力；還有一篇是關於制作真彩啟動畫面的文章，不過其限制對位圖操作，而不支持jpg, gif，而且使用繁瑣，基本上是對Splash Screen組件導入後的代碼進行簡單修改。琢磨了好大一會兒才學會使用。
有感於現有材料使用起來不方便，隨進行了整合和再封裝處理,設計了CSplashWnd類，使用起來非常簡便。下面就把我設計的類介紹給大家。有什麼不當或錯誤之處，敬請指正。我的Email: [email protected]
2．CSplashWnd功能
能夠顯示真彩啟動畫面，能在畫面上顯示初始化文字信息，支持jpg,gif,bmp圖像文件。
3. CSplashWnd的設計
3.1 用戶關心的接口
用戶使用的公開接口：
public: CSplashWnd(LPCTSTR lpszFileName);// 指定作為啟動畫面的圖像文件,並裝載BOOL ShowSplash();//顯示畫面void CloseSplash();//關閉畫面void ShowText(LPCTSTR pCh);在顯示的圖像上中間位置處顯示初始化信息文字3.2 其他接口
系統使用的公開接口：(用戶不關心)
~CSplashWnd()void PostNcDestroy();私有接口：(用戶不關心)
BOOL Create(CWnd* pParentWnd = NULL);int OnCreate(LPCREATESTRUCT lpCreateStruct);void OnPaint();3.3 數據設計(用戶不關心)
BOOL fileIsValid//指示CPicture pic;//用於對圖像文件進行操作的類int width,height;3.4 限制
√ 不允許繼承。
√ 為簡化接口，只提供從文件裝載圖像
3.5 需要的頭文件
StdAfx.h, VC++6.0自動生成的對MFC的支持，不同的工程選項會產生不同的StdAfx.h。
afxwin.h 支持CRect類
atlbase.h 提供對IPicture （COM類）的支持。
afxpriv2.h提供對CArchiveStream類的支持。
4.類的健壯性和可調試性設計
圖像文件是否有效?
需要檢查文件是否有效，當裝載圖像文件失敗時，fileIsValid為false，否則為true。這樣在調用ShowSplash時將什麼都不做，返回false。這時，用戶應檢查圖像文件是否存在，文件名稱拼寫是否正確。
5. 用法
√ 將CSplashWnd類加入項目中
√ 在使用CSplashWnd類的文件中#include “Splash.h”
√ 在合適的位置定義一個CSplashWnd對象
√ 在想顯示啟動畫面的地方調用ShowSplash顯示於屏幕上
√ 如果想在啟動畫面上顯示一些初始化或其他提示信息，調用ShowText。
√ 在你想關閉啟動畫面的地方
在你的App類InitInstance函數中,顯示主窗口之前使用，進行上述步驟，這是最典型的用法，如下面代碼所示。
BOOL CTsApp::InitInstance(){ AfxEnableControlContainer(); #ifdef _AFXDLL Enable3dControls(); // Call this when using MFC in a shared DLL#else Enable3dControlsStatic(); // Call this when linking to MFC statically#endif SetRegistryKey(_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 window RUNTIME_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 needed pCsw->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. 類代碼
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 resources BOOL Load(UINT nIDRes); BOOL Load(LPCTSTR pszPathName); BOOL Load(CFile& file); BOOL Load(CArchive& ar); BOOL Load(IStream* pstm); // render to device context CSize 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 IPicture HRESULT m_hr; // last error code};///////////////////////////////////////////////////////////////////////declare CSplashWnd//class CSplashWnd : public CWnd{// Constructionpublic: CSplashWnd(LPCTSTR lpszFileName);// Operationspublic: BOOL ShowSplash(); BOOL PreTranslateAppMessage(MSG* pMsg); void ShowText(LPCTSTR lpStr); void CloseSplash();// Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CSplashWnd) //}}AFX_VIRTUAL// Implementationpublic: ~CSplashWnd(); virtual void PostNcDestroy();private: BOOL Create(CWnd* pParentWnd = NULL);// Generated message map functionsprivate: //{{AFX_MSG(CSplashWnd) afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); afx_msg void OnPaint(); //}}AFX_MSG DECLARE_MESSAGE_MAP()private: int height;//the height of the displayed picture int width;//the width of the displayed picture CPicture pic;//used to Operate the picture BOOL fileIsValid;};#endif6.2 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_FILEstatic 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_MAPEND_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 file HINSTANCE hInst = AfxGetResourceHandle(); HRSRC hRsrc = ::FindResource(hInst, MAKEINTRESOURCE(nIDRes), "IMAGE"); // type if (!hRsrc) return FALSE; // load resource into memory DWord len = SizeofResource(hInst, hRsrc); BYTE* lpRsrc = (BYTE*)LoadResource(hInst, hRsrc); if (!lpRsrc) return FALSE; // create memory file and load it CMemFile 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 units m_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 units GetHIMETRICSize(hmWidth, hmHeight); m_spIPicture->Render(*pDC, rc.left, rc.top, rc.Width(), rc.Height(), 0, hmHeight, hmWidth, -hmHeight, prcMFBounds); return TRUE;}參考連接：
jpg/gif圖像顯示文章(英文)
真彩啟動畫面的制作(中文)
