C / C++ / MFC

typedef struct _D3DLOCKED_RECT
{
    INT                 Pitch;
    void*               pBits;
} D3DLOCKED_RECT;

//HWND Handle_of_ListBox; // A global defined earlier.

Handle_of_ListBox = CreateWindowEx(
  WS_EX_CLIENTEDGE, // extended window styles
  L"LISTBOX", // list box window class name
  nullptr,
  WS_CHILD | WS_VISIBLE, // window styles
  MainWindow_Width - 400,   // horizontal position
  MainWindow_Height - 300,  // vertical position
  300, // width
  200, // height
  Handle_of_MainWindow,
  nullptr,
  hInstance,
  nullptr
);

//ShowWindow(Handle_of_ListBox, SW_SHOW);
//ShowWindow(Handle_of_ListBox, SW_HIDE);

void Initialize_FRONT_BUFFER()
    {
	//    I already created these a globals
	//
	//    HDC	HDC_of_FRONT_BUFFER;
	//    HBITMAP	Canvas_for_FRONT_BUFFER;
	//    int		FRONT_BUFFER_WIDTH;
	//    int		FRONT_BUFFER_HEIGHT;
	//    int		FRONT_BUFFER_Temp;


                // The HDC_of_MainWindow was released in elsewhere. So, get it again.
                HDC_of_MainWindow = GetDC( Handle_of_MainWindow );

                // Create the HBITMAP "canvas", or surface on which we will draw.
                Canvas_for_FRONT_BUFFER = CreateCompatibleBitmap( HDC_of_MainWindow, FRONT_BUFFER_WIDTH, FRONT_BUFFER_HEIGHT );

                if (Canvas_for_FRONT_BUFFER == NULL)
                    {
                        MessageBox(nullptr,L"failed to create Canvas_for_FRONT_BUFFER",L"Error!",MB_ICONEXCLAMATION | MB_OK);
                    }

                // Create the HDC "device context", or collection of tools
                //    and brushes that we can use to draw on our canvas.
                HDC_of_FRONT_BUFFER = CreateCompatibleDC( HDC_of_MainWindow );

                if (HDC_of_FRONT_BUFFER == NULL)
                    {
                        MessageBox(nullptr,L"failed to create the HDC_of_FRONT_BUFFER",L"Error!",MB_ICONEXCLAMATION | MB_OK);
                    }

                // Permanently associate the surface on which to draw the
                //    ("canvas") (HBITMAP), with the "set of brushes" (HDC).

                // "select in" the Canvas_for_FRONT_BUFFER into the HDC_of_FRONT_BUFFER.
                HBITMAP Temporary_HBITMAP = (HBITMAP)SelectObject( HDC_of_FRONT_BUFFER, Canvas_for_FRONT_BUFFER );

                // Delete the "canvas" that the HDC_of_FRONT_BUFFER was going to draw to.
                DeleteObject ( Temporary_HBITMAP );

                /// Release the dc of the main window itself
                ReleaseDC ( Handle_of_MainWindow, HDC_of_MainWindow );
    }

void Draw_Something_To_FRONT_BUFFER()
    {

        int W=FRONT_BUFFER_WIDTH;
        int H=FRONT_BUFFER_HEIGHT;

        StretchBlt(HDC_of_FRONT_BUFFER, 0, 0, W,  H, HDC_of_Something, 0, 0, W,  H, SRCCOPY);   

    }

void Draw_From_FRONT_BUFFER_To_MainWindow()
    {

        HDC_of_MainWindow = GetDC( Handle_of_MainWindow ) ;

        // Now copy the FRONT_BUFFER to the MainWindow.
        BitBlt
            (
                HDC_of_MainWindow,	// destination buffer, in this case the front buffer.
                0,                  // Horizontal start for drawing.
                0,	                // Vertical   start for drawing.
                FRONT_BUFFER_WIDTH,       // Width to draw.
                FRONT_BUFFER_HEIGHT,       // Height to draw.
                HDC_of_FRONT_BUFFER,  // SOURCE buffer.  We are taking from that back canvas.
                0,                  // Horizontal start copying from.
                0,		            // Vertical   start copying from.
                SRCCOPY             // Just want a straight copy.
            );

        ReleaseDC( Handle_of_MainWindow, HDC_of_MainWindow ) ;

    }

void Draw_Something_To_FRONT_BUFFER()
    {

        int W=FRONT_BUFFER_WIDTH;
        int H=FRONT_BUFFER_HEIGHT;

        StretchBlt(HDC_of_FRONT_BUFFER, 0, 0, W,  H, HDC_of_Something, 0, 0, W,  H, SRCCOPY);   

        //This does not show up.
        ShowWindow(Handle_of_ListBox, SW_SHOW);

    }