VC启动窗口画面制作方法研究
源代码运行效果图如下：
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
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。
3.1 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。
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。
√ 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 _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. 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 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;}参考连接：jpg/gif图像显示文章(英文)
