若要改变CView，CFrameWnd或CWnd对象的背景颜色需要处理WM_ERASEBKGND消息，下面就是一个范例代码：
1 BOOL CSampleView::OnEraseBkgnd(CDC* pDC) 2 { 3 4 //设置brush为希望的背景颜色 5 CBrush backBrush(RGB(255, 128, 128)); 6 7 //保存旧的brush 8 CBrush* pOldBrush = pDC-> SelectObject（&backBrush); 9 CRect rect; 10 pDC-> GetClipBox(&rect); 11 12 //画需要的区域 13 pDC-> PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY); 14 pDC-> SelectObject(pOldBrush); 15 16 return TRUE; 17 18 }
若要改变CFromView继承类的背景颜色，下面是一个范例代码：
1 HBRUSH CMyFormView::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 2 { 3 4 switch (nCtlColor) 5 { 6 7 case CTLCOLOR_BTN: 8 case CTLCOLOR_STATIC: 9 { 10 11 pDC-> SetBkMode(TRANSPARENT); 12 //不加任何处理或设置背景为透明 13 14 } 15 case CTLCOLOR_DLG: 16 { 17 18 CBrush* back_brush; 19 COLORREF color; 20 color = (COLORREF) GetSysColor(COLOR_BTNFACE); 21 back_brush = new CBrush(color); 22 return (HBRUSH) (back_brush-> m_hObject); 23 24 } 25 26 } 27 28 return(CFormView::OnCtlColor(pDC, pWnd, nCtlColor)); 29 30 }