VC比例放大缩小

    CRect rect;
    ::GetWindowRect(m_hWnd, rect);
    ScreenToClient(rect);
    m_nDlgWidth = rect.right - rect.left;
    m_nDlgHeight = rect.bottom - rect.top;
    //计算分辨率
    m_nWidth = GetSystemMetrics(SM_CXSCREEN);
    m_nHeight = GetSystemMetrics(SM_CYSCREEN);
    //计算放大倍数
    m_Multiple_width = float(m_nWidth)/float(m_nDlgWidth);
    m_Multiple_height = float(m_nHeight)/float(m_nDlgHeight);

    change_flag = TRUE;//判断onSize执行时OnInitDlg是否已执行
    MoveWindow(0,0,m_nWidth,m_nHeight, TRUE);

void CTDemoDlg::OnSize(UINT nType, int cx, int cy) 
{
    CDialog::OnSize(nType, cx, cy);
    
    if (change_flag)
    {
        
        ReSize(IDC_BUTTON);
        ReSize(IDOK);
        ReSize(IDCANCEL);
        //恢复放大倍数，并保存
        m_Multiple_height = float(1)/m_Multiple_height;
        m_Multiple_width = float(1)/m_Multiple_width;
    }
    
}

void CTDemoDlg::ReSize(int nID)
{
    CRect rect;
    GetDlgItem(nID)->GetWindowRect(rect);
    ScreenToClient(rect);
    //计算控件左上角点
    CPoint OldTLPoint, TLPoint;
    OldTLPoint = rect.TopLeft();
    TLPoint.x = long(OldTLPoint.x*m_Multiple_width);
    TLPoint.y = long(OldTLPoint.y*m_Multiple_height);
    //计算控件右下角点
    CPoint OldBRPoint,BRPoint;
    OldBRPoint = rect.BottomRight();
    BRPoint.x = long(OldBRPoint.x*m_Multiple_width);
    BRPoint.y = long(OldBRPoint.y*m_Multiple_height);
    //移动控件到新矩形
    rect.SetRect(TLPoint,BRPoint);
    GetDlgItem(nID)->MoveWindow(rect, TRUE);
}