在窗口中贴图

在窗口中贴图
1.创建位图
BITMAP                      m_bmp;
HBITMAP                     m_hBitmap;
m_hBitmap=LoadBitmap(hInst,MAKEINTRESOURCE(IDB_BITMAP1));
GetObject(m_hBitmap, sizeof(BITMAP),&m_bmp);

2.创建兼容DC
HDC hdc=GetDC(hWnd);
HDC dcCompatibleDC=CreateCompatibleDC(hdc);

3.将位图选到兼容DC中
HBITMAP hdcOld=(HBITMAP)SelectObject(dcCompatibleDC,m_hBitmap);

4.将兼容DC中的位图贴到当前DC中
BitBlt(hdc,0,0,rect.right,rect.bottom,dcCompatibleDC,0,0,SRCCOPY);

SelectObject(dcCompatibleDC,hdcOld);
DeleteDC(dcCompatibleDC);

case WM_ERASEBKGND:{HDC hdc=GetDC(hWnd);HDC dcCompatibleDC=CreateCompatibleDC(hdc);//选择一个对象到设备上下文。HBITMAP hdcOld=(HBITMAP)SelectObject(dcCompatibleDC,m_hBitmap);RECT rect={0};GetClientRect(hWnd,&rect);//复制一个位图从源设备上下文当前设备上下文。BitBlt(hdc,0,0,rect.right,rect.bottom,dcCompatibleDC,0,0,SRCCOPY);//将源矩形中的位图拷贝到目标矩形，必要时拉伸或压缩位图以适合目标矩形的尺寸。//StretchBlt(hdc,0,0,rect.right,rect.bottom,dcCompatibleDC,0,0,m_bmp.bmWidth,m_bmp.bmHeight,SRCCOPY);SelectObject(dcCompatibleDC,hdcOld);DeleteDC(dcCompatibleDC);}break;case WM_PAINT:{hdc = BeginPaint(hWnd, &ps);// TODO: 在此添加任意绘图代码...HDC dcCompatibleDC=CreateCompatibleDC(hdc);//选择一个对象到设备上下文。HBITMAP hdcOld=(HBITMAP)SelectObject(dcCompatibleDC,m_hBitmap);RECT rect={0};GetClientRect(hWnd,&rect);//复制一个位图从源设备上下文当前设备上下文。BitBlt(hdc,0,0,rect.right,rect.bottom,dcCompatibleDC,0,0,SRCCOPY);//将源矩形中的位图拷贝到目标矩形，必要时拉伸或压缩位图以适合目标矩形的尺寸。//StretchBlt(hdc,0,0,rect.right,rect.bottom,dcCompatibleDC,0,0,m_bmp.bmWidth,m_bmp.bmHeight,SRCCOPY);SelectObject(dcCompatibleDC,hdcOld);DeleteDC(dcCompatibleDC);EndPaint(hWnd, &ps);}break;

 MFC中响应

 //绘画背景
 afx_msg BOOL OnEraseBkgnd(CDC* cdc);

afx_msg void OnPaint();

ON_WM_ERASEBKGND()

ON_WM_PAINT()