在客戶區(qū)顯示一個Logo位圖

1、在客戶區(qū)顯示一個Logo位圖 如果你想在客戶區(qū)繪圖 （如一個logo圖象或整個背景底圖), 該類很適合你所需.如果你想繪制一個logo, 它將只重繪無效矩形區(qū)，因為我使用了內(nèi)存dc,它繪制時很平滑，無閃爍現(xiàn)象。在CMainFrame,重載OnCreateClient虛函數(shù): BOOL CMainFrame:OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) / TODO: Add your specialized code here and/or call the base classif(CMDIFrameWnd:OnC

2、reateClient(lpcs, pContext)m_ClientFrame.SubclassWindow(m_hWndMDIClient) ;return TRUE;else return FALSE; 頭文件：#if !defined(AFX_CLIENTFRAME_H_9F201E20_8B54_11D1_87E4_00AA00242F4F_INCLUDED_)#define AFX_CLIENTFRAME_H_9F201E20_8B54_11D1_87E4_00AA00242F4F_INCLUDED_#if _MSC_VER >= 1000#pragma once#endif

3、 / _MSC_VER >= 1000/ ClientFrame.h : header file/ CClientFrame frameclass CClientFrame : public CWndDECLARE_DYNCREATE(CClientFrame)protected:/ Attributespublic:CClientFrame(); / protected constructor used by dynamic creationvirtual CClientFrame();static WNDPROC pfnSuper;/ Operationspublic:CPalett

4、e m_palette;CBitmap m_bitmap;virtual WNDPROC* GetSuperWndProcAddr() ;/ Overrides/ ClassWizard generated virtual function overrides/AFX_VIRTUAL(CClientFrame)/AFX_VIRTUAL/ Implementationprotected:/ Generated message map functions/AFX_MSG(CClientFrame)afx_msg BOOL OnEraseBkgnd(CDC* pDC);afx_msg void On

5、Paint();/AFX_MSGDECLARE_MESSAGE_MAP();/AFX_INSERT_LOCATION/ Microsoft Developer Studio will insert additional declarations immediately before the previous line.#endif / !defined(AFX_CLIENTFRAME_H_9F201E20_8B54_11D1_87E4_00AA00242F4F_INCLUDED_)實現(xiàn)框架：/ ClientFrame.cpp : implementation file/ #include &q

6、uot;stdafx.h"#include "ClientFrame.h"#include "helper.h" #ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endif extern CRect oldrect; WNDPROC CClientFrame:pfnSuper = NULL; / CClientFrame IMPLEMENT_DYNCREATE(CClientFrame, CWnd) CClientFrame:CC

7、lientFrame()GetBitmapAndPalette( IDB_LOGO, m_bitmap, m_palette ); CClientFrame:CClientFrame()BEGIN_MESSAGE_MAP(CClientFrame, CWnd)/AFX_MSG_MAP(CClientFrame)ON_WM_ERASEBKGND()ON_WM_PAINT()/AFX_MSG_MAPEND_MESSAGE_MAP() / CClientFrame message handlers BOOL CClientFrame:OnEraseBkgnd(CDC* pDC) / TODO: Ad

8、d your message handler code here and/or call defaultreturn TRUE;WNDPROC* CClientFrame:GetSuperWndProcAddr()return &pfnSuper;void CClientFrame:OnPaint() / Do not call CWnd:OnPaint() for painting messages/ TODO: Add your message handler code hereInvalidateRect(&oldrect);CRect newrect;GetClient

9、Rect(&newrect);/CDC *dc=GetDC();/dc->DPtoLP(newrect);/ReleaseDC(dc);BITMAP bm;m_bitmap.GetBitmap(&bm);newrect=CRect(newrect.Width()/2-bm.bmWidth/2,newrect.Height()/2-bm.bmHeight/2,newrect.Width()/2-bm.bmWidth/2+ bm.bmWidth,newrect.Height()/2-bm.bmHeight/2+ bm.bmHeight);InvalidateRect(&

10、;newrect);CPaintDC dc(this); / device context for painting/dc.SelectClipRgn(NULL);DrawTheBackground(this,&dc,&m_palette,&m_bitmap,TRUE); #ifndef _HELPER_H_#define _HELPER_H_void DrawTheBackground(CWnd *view,CDC *pDC,CPalette *mp_palette,CBitmap *mp_bitmap,BOOL middle = FALSE);BOOL GetBit

11、mapAndPalette(UINT nIDResource, CBitmap &bitmap, CPalette &pal);#endif Helper implementation: #include "stdafx.h"#include "helper.h"#include "memdc.h" CRect oldrect(0,0,0,0); void DrawTheBackground(CWnd *view,CDC *pDC,CPalette *mp_palette,CBitmap *mp_bitmap,BOOL

12、 middle)if(pDC->IsPrinting()return;CRect rect;CPalette *old_palette=NULL;/ Select and realize the paletteif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && mp_palette->m_hObject != NULL )old_palette=pDC->SelectPalette( mp_palette, FALSE );pDC->RealizePalette();view->Get

13、ClientRect(rect);pDC->DPtoLP(rect);CMemDC DC(pDC,rect);CDC dcImage;if (!dcImage.CreateCompatibleDC(pDC)return;BITMAP bm;mp_bitmap->GetBitmap(&bm);/ Paint the image.CBitmap* pOldBitmap = dcImage.SelectObject(mp_bitmap);if(middle)CBrush* pOldBrush = (CBrush*)DC->SelectStockObject(GRAY_BRU

14、SH);CRect crect;oldrect=CRect(rect.Width()-bm.bmWidth)/2,(rect.Height()-bm.bmHeight)/2,(rect.Width()-bm.bmWidth)/2+ bm.bmWidth,(rect.Height()-bm.bmHeight)/2+ bm.bmHeight);pDC->GetClipBox(&crect);DC->PatBlt( crect.left, crect.top, crect.Width(), crect.Height(),PATCOPY);DC->SelectObject(p

15、OldBrush);DC->BitBlt(oldrect.left, oldrect.top, bm.bmWidth, bm.bmHeight, &dcImage, 0, 0, SRCCOPY);elsefor(int i=(int)floor(double)rect.left/bm.bmWidth)*bm.bmWidth;i<=rect.right/*rect.Width()*/;i+=bm.bmWidth) for(int j="(int)floor(double)rect.top/bm.bmHeight)*bm.bmHeight;j<=rect.bot

16、tom/*rect.Height()*/;j+=bm.bmHeight)" DC->BitBlt(i, j, bm.bmWidth, bm.bmHeight, &dcImage, 0, 0, SRCCOPY);dcImage.SelectObject(pOldBitmap); pDC->SelectPalette(old_palette,FALSE);pDC->RealizePalette(); BOOL GetBitmapAndPalette(UINT nIDResource, CBitmap &bitmap, CPalette &pal)

17、LPCTSTR lpszResourceName = (LPCTSTR)nIDResource;HBITMAP hBmp = (HBITMAP):LoadImage( AfxGetInstanceHandle(), lpszResourceName, IMAGE_BITMAP, 0,0, LR_CREATEDIBSECTION );if( hBmp = NULL )return FALSE;bitmap.Attach( hBmp );/ Create a logical palette for the bitmapDIBSECTION ds;BITMAPINFOHEADER &bmIn

18、fo = ds.dsBmih;bitmap.GetObject( sizeof(ds), &ds );int nColors = bmInfo.biClrUsed ? bmInfo.biClrUsed : 1 << bmInfo.biBitCount; / Create a halftone palette if colors> 256. CClientDC dc(NULL); / Desktop DCif( nColors > 256 ) pal.CreateHalftonePalette( &dc );else/ Create the palette

19、RGBQUAD *pRGB = new RGBQUADnColors;CDC memDC;memDC.CreateCompatibleDC(&dc);memDC.SelectObject( &bitmap );:GetDIBColorTable( memDC, 0, nColors, pRGB );UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors);LOGPALETTE *pLP = (LOGPALETTE *) new BYTEnSize;pLP->palVersion = 0x300;p

20、LP->palNumEntries = nColors;for( int i=0; i palPalEntryi.peRed = pRGBi.rgbRed;pLP->palPalEntryi.peGreen = pRGBi.rgbGreen;pLP->palPalEntryi.peBlue = pRGBi.rgbBlue;pLP->palPalEntryi.peFlags = 0;pal.CreatePalette( pLP );delete pLP;delete pRGB;return TRUE;CMemDC implementation (for those who

21、 don't have it yet): #ifndef _MEMDC_H_#define _MEMDC_H_/ CMemDC - memory DC/ Author: Keith Rule/ Email: keithr/ Copyright 1996-1997, Keith Rule/ You may freely use or modify this code provided this/ Copyright is included in all derived versions./ History - 10/3/97 Fixed scrolling bug./ Added pri

22、nt support./ 12/19/97 Adrian Roman - modified the constructor to take two parameters/ This class implements a memory Device Context class CMemDC : public CDC private:CBitmap m_bitmap; / Offscreen bitmapCBitmap* m_oldBitmap; / bitmap originally found in CMemDCCDC* m_pDC; / Saves CDC passed in constru

23、ctorBOOL m_bMemDC; / TRUE if CDC really is a Memory DC.public:CRect m_rect; / Rectangle of drawing area.CMemDC(CDC* pDC, CRect &rect) : CDC(), m_oldBitmap(NULL), m_pDC(pDC)ASSERT(m_pDC != NULL); / If you asserted here, you passed in a NULL CDC.m_bMemDC = !pDC->IsPrinting();m_rect=rect;if (m_bMemDC)/ Create a Memory DCCreateCompatibleDC(pDC);pDC->GetClipBox(&m_rect);m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height();m_oldBitmap = SelectObje