C#

__declspec(dllexport) int ANB_Printf(ANB_DATAGRAM *dgram, uint8_t cmd_if_ack_nak, FILE *stream)
{
...
    fprintf(stream, "* LineNo : %u\n", uint32_val);
...
}

[DllImport("anb_protocol_lib.dll")]
public static extern int ANB_Printf([MarshalAs(UnmanagedType.Struct)] ref ANB_DATAGRAM dgram, uint8_t cmd_if_ack_nak, ??? stream);

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
using Microsoft.Office.Core;
using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Word;
using System.Drawing.Printing;

   string startupPath = @"C:\Users\infoobjects\Desktop\";
            string filename1 = "Test1.doc";
            var docPath = Path.Combine(startupPath, filename1);
            Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();

            test.messageclass.MessageFilter.Register();

            app.Visible = true;

            var doc = app.Documents.Open(docPath);

            doc.ShowGrammaticalErrors = false;
            doc.ShowRevisions = false;
            doc.ShowSpellingErrors = false;

            if (!Directory.Exists(startupPath + "\\" + filename1.Split('.')[0]))
            {
                Directory.CreateDirectory(startupPath + "\\" + filename1.Split('.')[0]);
            }

            //Opens the word document and fetch each page and converts to image
            foreach (Microsoft.Office.Interop.Word.Window window in doc.Windows)
            {
                foreach (Microsoft.Office.Interop.Word.Pane pane in window.Panes)
                {
                    pane.View.DisplayBackgrounds = true;

                    for (var ii = 1; ii <= pane.Pages.Count; ii++)
                    {
                        var page = pane.Pages[ii];
                        var bits = page.EnhMetaFileBits;
                        var target = Path.Combine(startupPath + "\\" + filename1.Split('.')[0], string.Format("{1}_page_{0}", ii, filename1.Split('.')[0]));

                        try
                        {
                            using (var ms = new MemoryStream((byte[])(bits)))
                            {
                                var image = System.Drawing.Image.FromStream(ms);
                                var pngTarget = Path.ChangeExtension(target, "Wmf");
                                image.Save(pngTarget, System.Drawing.Imaging.ImageFormat.Wmf);
                            }

                        }
                        catch (System.Exception ex)
                        { }
                    }
                }
            }
            doc.Close(Type.Missing, Type.Missing, Type.Missing);
            app.Quit(Type.Missing, Type.Missing, Type.Missing);
            test.messageclass.MessageFilter.Revoke();

I have also tried to recreate the same image with diff background, some results
I would appreciate any feedback as to where I'm going wrong...