| 用VC制作带有滚动字幕的软件封面软件启动时，常常需要自下而上循环滚动显示一些诸如软件名称、功能、版本、用户名、研制单位等信息的文字，在用户按任意键或点击鼠标键后，立即结束演示进入程序主界面。本文在VC中通过向工程中添加Splash screen组件，然后扩展CSplashWnd类方便地实现了这一功能。设计步骤如下：1.创建一个名为test的SDI工程；2.向工程中添加Splash screen组件，即添加CSplashWnd类；3.导入软件封面的位图资源，标识号为IDB_SPLASH；4.向CSplashWnd类中添加函数DrawText,在软件封面中显示文字。代码如下：void CSplashWnd::DrawText(CDC *pDC, int x, int y, int nAlign,CString sFontName, int nFONTSIZE0,COLORREF crTextColor, CString sText){ //pDC:内存dc，x,y:文字位置，nAlign:对齐方式//sFont:字体，nFONTSIZE0:字号，crTextColor:文字颜色，sText：正文LOGFONT lf;//字体lf.lfStrikeOut=0;//删除线lf.lfCharSet = DEFAULT_CHARSET ;//字符集lf.lfEscapement =0;//角度lf.lfItalic = 0 ;//倾斜lf.lfUnderline = 0 ;//下划线lf.lfHeight = nFONTSIZE0 ;//字号strcpy(lf.lfFaceName,sFaceName.GetBuffer(sFontName.GetLength()));CFont font ;font.CreateFontIndirect(&lf);CFont *pOldFont = (CFont *)pDC->SelectObject(&font);UINT oldAlign,uAlign ;switch(nAlign){case 0: uAlign = TA_LEFT | TA_TOP ; break;case 1: uAlign = TA_CENTER | TA_TOP; break;case 2: uAlign = TA_RIGHT | TA_TOP ; break; default: uAlign = TA_LEFT | TA_TOP ; break;}oldAlign = pDC->SetTextAlign(uAlign);int oldMode = pDC->SetBkMode(TRANSPARENT);int oldColor = pDC->SetTextColor(crTextColor) ;pDC->TextOut(x,y,sText);pDC->SetTextColor(oldColor) ;pDC->SetTextAlign(oldAlign);pDC->SetBkMode(oldMode);pDC->SelectObject(pOldFont);font.DeleteObject();}5. 给CSplashWnd类中添加以下变量，并在构造函数中加入初始化代码；class CSplashWnd : public CWnd{public: CDC m_dcText,m_dcImage;//显示dc的兼容内存dcCBitmap* m_pBitmap;//位图对象指针CBitmap* m_pOldBitmapText,*m_pOldBitmap;//跟踪内存dc中的原位图CRgn m_rgn;//用于生成矩形区域CRect m_TextRect ;//显示文字的矩形区域int m_nCurPos ;//文字当前位置}CSplashWnd::CSplashWnd(){ m_nCurPos = 50 ;}6.设置显示文字的矩形区域。BOOL CSplashWnd::Create(CWnd* pParentWnd /*= NULL*/){ m_TextRect.CopyRect(&CRect(50,100,500,300));}7.添加 WM_PAINT消息处理函数，调用CSplashWnd::DrawText显示文字。void CSplashWnd::OnPaint(){ CPaintDC dc(this);BITMAP bm;m_bitmap.GetBitmap(&bm);static BOOL bFirst = TRUE;//指示是否第一次绘制窗口if(bFirst){ if (!m_dcImage.CreateCompatibleDC(&dc)) return;m_pOldBitmap = m_dcImage.SelectObject(&m_bitmap); if (!m_dcText.CreateCompatibleDC(&dc)) return;m_pBitmap = new CBitmap ;int nBitCount = m_dcText.GetDeviceCaps(BITSPIXEL);m_pBitmap->CreateBitmap(bm.bmWidth,bm.bmHeight,1,nBitCount,NULL);m_pOldBitmapText = m_dcText.SelectObject(m_pBitmap);m_rgn.CreateRectRgn(m_TextRect.left,m_TextRect.top, m_TextRect.right,m_TextRect.bottom);bFirst = FALSE;}m_dcText.SelectClipRgn(NULL);m_dcText.BitBlt(0, 0, bm.bmWidth, bm.bmHeight,&m_dcImage, 0, 0, SRCCOPY);m_dcText.SelectClipRgn(&m_rgn);int nBasex = m_TextRect.left ; int nBasey = m_TextRect.bottom-m_nCurPos; int nMidx = m_TextRect.left + m_TextRect.Width()/2 ;DrawText(&m_dcText,nMidx,nBasey, 1,"楷体_GB2312",20, RGB(0,0,255) ,"研制单位");DrawText(&m_dcText,nMidx,nBasey+30, 1,"楷体_GB2312",15, RGB(0,255,255) ,"武警指挥学院模拟中心");dc.BitBlt(0, 0, bm.bmWidth, bm.bmHeight,&m_dcText, 0,0, SRCCOPY);}8．改变文字垂向位置，出现循环滚动效果：void CSplashWnd::OnTimer(UINT nIDEvent){ m_nCurPos++;if( m_nCurPos>300 ) //循环{ m_nCurPos = 0 ;}Invalidate(TRUE);}9. 演示软件封面时，隐藏主框架窗口：BOOL CTestApp::InitInstance(){ m_pMainWnd->ShowWindow(SW_HIDE);m_pMainWnd->UpdateWindow();}10.按任意键或点击鼠标键结束封面演示： LRESULT CSplashWnd::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { if (c_pSplashWnd){if (message == WM_KEYDOWN ||message == WM_SYSKEYDOWN ||message == WM_LBUTTONDOWN ||message == WM_RBUTTONDOWN ||message == WM_MBUTTONDOWN ||message == WM_NCLBUTTONDOWN ||message == WM_NCRBUTTONDOWN ||message == WM_NCMBUTTONDOWN){ c_pSplashWnd->HideSplashScreen();AfxGetMainWnd()->ShowWindow(SW_MAXIMIZE);return TRUE; }}return CWnd::WindowProc(message, wParam, lParam);}11.封面窗口销毁后，释放有关对象：void CSplashWnd::PostNcDestroy(){ m_dcImage.SelectObject(m_pOldBitmap);m_dcText.SelectClipRgn(NULL);m_dcText.SelectObject(m_pOldBitmapText);m_bitmap.DeleteObject();m_rgn.DeleteObject();delete this;}文中程序在Windows9、Visual C++ 6.0下运行通过。 |
