VC++ 预览BMP图像

//Download by http://www.NewXing.com // 1View.cpp : implementation of the CMy1View class // #include "stdafx.h" #include "1.h" #include "1Doc.h" #include "1View.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMy1View IMPLEMENT_DYNCREATE(CMy1View, CView) BEGIN_MESSAGE_MAP(CMy1View, CView) //{{AFX_MSG_MAP(CMy1View) ON_WM_ERASEBKGND() ON_COMMAND(ID_OPENBMP, OnOpenbmp) ON_WM_RBUTTONDOWN() //}}AFX_MSG_MAP // Standard printing commands ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview) END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMy1View construction/destruction CMy1View::CMy1View() { m_hBitmap = NULL; } CMy1View::~CMy1View() { } BOOL CMy1View::PreCreateWindow(CREATESTRUCT& cs) { return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CMy1View drawing void CMy1View::OnDraw(CDC* pDC) { CBitmap bitmap; CMy1Doc* pDoc = GetDocument(); ASSERT_VALID(pDoc); CRect rect; GetClientRect(&rect); CDC memDC; //创建兼容性的DC CBitmap tempBitmap; memDC.CreateCompatibleDC (pDC); //位图选入兼容PC memDC.SelectObject(&bitmap); tempBitmap.CreateCompatibleBitmap (pDC,rect.Width(),rect.Height()); CBitmap *pOldBitmap=memDC.SelectObject (&tempBitmap); memDC.FillSolidRect(0,0,rect.Width(),rect.Height(),RGB(0,0,0)); memDC.SetBkMode (TRANSPARENT); if(m_hBitmap) { CBitmap tmpBitmap2; tmpBitmap2.Attach((HBITMAP)m_hBitmap); CDC tmpdc; tmpdc.CreateCompatibleDC (&memDC); CBitmap *pOldBitmap2 = tmpdc.SelectObject (&tmpBitmap2); memDC.BitBlt(0,0,rect.Width(),rect.Height(),&tmpdc,0,0,SRCCOPY); tmpdc.SelectObject(pOldBitmap2); tmpBitmap2.Detach(); } pDC->BitBlt (0,0,rect.Width(),rect.Height(),&memDC,0,0,SRCCOPY); memDC.SelectObject(pOldBitmap); memDC.DeleteDC(); } ///////////////////////////////////////////////////////////////////////////// // CMy1View printing BOOL CMy1View::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void CMy1View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { } void CMy1View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { } ///////////////////////////////////////////////////////////////////////////// // CMy1View diagnostics #ifdef _DEBUG void CMy1View::AssertValid() const { CView::AssertValid(); } void CMy1View::Dump(CDumpContext& dc) const { CView::Dump(dc); } CMy1Doc* CMy1View::GetDocument() // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMy1Doc))); return (CMy1Doc*)m_pDocument; } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CMy1View message handlers BOOL CMy1View::OnEraseBkgnd(CDC* pDC) { return TRUE; } void CMy1View::OnOpenbmp() { CFileDialog FileDialog(TRUE,NULL,NULL, OFN_NOCHANGEDIR, "BMP文件(*.bmp)|*.bmp|所有文件(*.*)|*.*||"); if (FileDialog.DoModal() == IDOK) { CString tmpStr = FileDialog.GetPathName(); m_hBitmap = ::LoadImage(NULL,tmpStr,IMAGE_BITMAP,0,0,LR_LOADFROMFILE); Invalidate(FALSE); } } void CMy1View::OnRButtonDown(UINT nFlags, CPoint point) { //先装入已有的菜单项 CMenu menu; menu.LoadMenu (IDR_MENU1); CMenu *pPopup = menu.GetSubMenu(0); ClientToScreen (&point); pPopup->TrackPopupMenu (TPM_LEFTALIGN,point.x,point.y,AfxGetMainWnd()); CView::OnRButtonDown(nFlags, point); }