如何在对话框显示图片

void CDisplayPic::OnPaint() 
{
//////////////以下三种情况任选一种会是不同效果(只能一种存在)///////////
    //CPaintDC dc(this);      //若用此句,得到的是对话框的DC,图片将被绘制在对话框上.
    CPaintDC dc(GetDlgItem(IDC_STATIC1)); //用此句,得到picture控件的DC,图像将被绘制在控件上  
    //  CDC dc;
    //  dc.m_hDC=::GetDC(NULL);  //若用此两句,得到的是屏幕的DC,图片将被绘制在屏幕上///////////////////////////////////////////////////////
    CRect rcclient;
    GetDlgItem(IDC_STATIC1)->GetClientRect(&rcclient);
    CDC memdc;
    memdc.CreateCompatibleDC(&dc);  
    CBitmap bitmap;
    bitmap.CreateCompatibleBitmap(&dc, rcclient.Width(), rcclient.Height());
    memdc.SelectObject( &bitmap );
    CWnd::DefWindowProc(WM_PAINT, (WPARAM)memdc.m_hDC , 0);
    CDC maskdc;
    maskdc.CreateCompatibleDC(&dc);
    CBitmap maskbitmap;
    maskbitmap.CreateBitmap(rcclient.Width(), rcclient.Height(), 1, 1, NULL);
    maskdc.SelectObject( &maskbitmap );
    maskdc.BitBlt( 0, 0, rcclient.Width(), rcclient.Height(), &memdc, 
        rcclient.left, rcclient.top, SRCCOPY);
    CBrush brush;
    brush.CreatePatternBrush(&m_bmp);
    dc.FillRect(rcclient, &brush);  
    
    
    dc.BitBlt(rcclient.left, rcclient.top, rcclient.Width(), rcclient.Height(), 
             &memdc, rcclient.left, rcclient.top,SRCPAINT);
    brush.DeleteObject();