求教:将C#体温单程序改造成c++的activex组件

求指教，我该怎么入手。老师可以附送完整的源程序。
            if (this.IsHandleCreated
                && this.Document != null
                && this.DesignMode == false )
            {
                using (Graphics g = pnlView.CreateGraphics())
                {
                    // 计算页面框架视图边界
                    _PageBounds = new Rectangle(
                        10,
                        10,
                        (int)(g.DpiX * this.PageSettings.Bounds.Width / 100f),
                        (int)(g.DpiY * this.PageSettings.Bounds.Height / 100f));
                    if (_PageBounds.Width + 20 < this.ClientSize.Width)
                    {
                        _PageBounds.X = 10 + (this.ClientSize.Width - _PageBounds.Width) / 2;
                    }
                    // 计算文档视图边界
                    _DocumentBounds.X = _PageBounds.X + (int)(this.PageSettings.Margins.Left * g.DpiX / 100f);
                    _DocumentBounds.Y = _PageBounds.Y + (int)(this.PageSettings.Margins.Top * g.DpiY / 100f);
                    _DocumentBounds.Width = _PageBounds.Right - (int)(this.PageSettings.Margins.Right * g.DpiX / 100f) - _DocumentBounds.Left;
                    _DocumentBounds.Height = _PageBounds.Bottom - (int)(this.PageSettings.Margins.Bottom * g.DpiY / 100f) - _DocumentBounds.Top;                    Size viewSize = new Size(
                        _PageBounds.Left + 10 ,
                        _PageBounds.Bottom + 10 );
                    
                    if (pnlView.AutoScrollMinSize != viewSize)
                    {
                        pnlView.AutoScrollMinSize = viewSize;
                    }