I want to extract an image from this function but I have no idea about DIBSECTION

C# language API

Actually, I want an image from normal view (current view) in solidwork (such as Top view or Front view) but not include any feature manager or command manager.

I have already try something like

[System.Runtime.InteropServices.DllImport("User32.dll", CharSet = CharSet.Auto, SetLastError = true)]

                    public static extern int PrintWindow(IntPtr hWnd, IntPtr hBltDC, uint iFlags);

I have try 3 input hWnd
1. IFrame.GetHWnd()
2. Frame.ModelWindows[0].HWnd
3. (SldWorks.ActiveDoc as IModelDoc2) .IActiveView.GetViewHWnd()

Those 3 method result black image in model view position (command manager ,feature manager and every menu are shown)      

any help?

Thank you