//CMDIClient类头文件 #if !defined(AFX_VNMDICLIENT_H__FC9EC8F2_8175_11D1_A16B_000000000000__INCLUDED_) #define AFX_VNMDICLIENT_H__FC9EC8F2_8175_11D1_A16B_000000000000__INCLUDED_ #if _MSC_VER >= 1000 #pragma once #endif // _MSC_VER >= 1000 class CMdiClient : public CWnd { DECLARE_DYNCREATE(CMdiClient) // Construction public: CMdiClient(); // Attributes public: // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CMdiClient) //}}AFX_VIRTUAL // Implementation public: BOOL SetBitmap(UINT nID); COLORREF SetBackColor(COLORREF nBackColor); virtual ~CMdiClient(); // Generated message map functions protected: //{{AFX_MSG(CMdiClient) afx_msg BOOL OnEraseBkgnd(CDC* pDC); afx_msg void OnSize(UINT nType, int cx, int cy); //}}AFX_MSG DECLARE_MESSAGE_MAP() private: CBitmap* m_pBmp; COLORREF m_nBackColor; }; ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Developer Studio will insert additional declarations immediately before the previous line. #endif // !defined(AFX_VNMDICLIENT_H__FC9EC8F2_8175_11D1_A16B_000000000000__INCLUDED_) //CMDIClient实现文件 #include "stdafx.h" #include "MdiClient.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif CMdiClient::CMdiClient() { m_pBmp = NULL; m_nBackColor = CLR_INVALID; } CMdiClient::~CMdiClient() { if (m_pBmp) { m_pBmp->DeleteObject(); delete m_pBmp; m_pBmp = NULL; } } IMPLEMENT_DYNCREATE(CMdiClient, CWnd) BEGIN_MESSAGE_MAP(CMdiClient, CWnd) //{{AFX_MSG_MAP(CMdiClient) ON_WM_ERASEBKGND() ON_WM_SIZE() //}}AFX_MSG_MAP END_MESSAGE_MAP() BOOL CMdiClient::OnEraseBkgnd(CDC* pDC) { CRect rect; GetClientRect(&rect); if (m_nBackColor != CLR_INVALID) pDC->FillSolidRect(&rect, m_nBackColor); else if (m_pBmp != NULL) { BITMAP bm; CDC dcMem; VERIFY(m_pBmp->GetObject(sizeof(BITMAP), (LPVOID)&bm)); dcMem.CreateCompatibleDC(NULL); CBitmap* pOldBitmap = dcMem.SelectObject(m_pBmp); for (register int nX = 0; nX < rect.Width(); nX += bm.bmWidth) for (register int nY = 0; nY < rect.Height(); nY += bm.bmHeight) pDC->BitBlt(nX, nY, bm.bmWidth, bm.bmHeight, &dcMem, 0, 0, SRCCOPY); dcMem.SelectObject(pOldBitmap); } else CWnd::OnEraseBkgnd(pDC); return TRUE; } COLORREF CMdiClient::SetBackColor(COLORREF nBackColor) { LockWindowUpdate(); COLORREF cr = m_nBackColor; m_nBackColor = nBackColor; UnlockWindowUpdate(); return cr; } BOOL CMdiClient::SetBitmap(UINT nID) { BOOL bResult = true; LockWindowUpdate(); if (m_pBmp) { m_pBmp->DeleteObject(); delete m_pBmp; m_pBmp = NULL; } m_pBmp = new CBitmap(); bResult = m_pBmp->LoadBitmap(nID); UnlockWindowUpdate(); return bResult; } void CMdiClient::OnSize(UINT nType, int cx, int cy) { CWnd::OnSize(nType, cx, cy); if (m_pBmp != NULL) Invalidate(); } ... //重载OnCreateClient(....)方法，子类化m_hWndMDIClient, 设置背景图 BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) { if (CMDIFrameWnd::OnCreateClient(lpcs, pContext)) { m_wndMdiClient.SubclassWindow(m_hWndMDIClient); m_wndMdiClient.SetBitmap(IDB_STONE); return TRUE; } else return FALSE; }