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上一篇的方法有很大的缺陷：（1）有的时候会掉线，主要是横线；（2）有的电脑没有画图程序，画图的方式也不唯一，有的叫无标题，有的叫未命名。

研究了整整一天，终于找到了方法，今天就只写了这一个函数

private Bitmap CopyFromWordToImage()
        {
            Bitmap b = null;
            object Nothing = System.Reflection.Missing.Value;
            object missing = System.Reflection.Missing.Value;

            Microsoft.Office.Interop.Word.Application WordApp = Marshal.GetActiveObject("Word.Application") as Microsoft.Office.Interop.Word.ApplicationClass;
            Microsoft.Office.Interop.Word.Document WordDoc = WordApp.ActiveDocument;
            WordDoc.ActiveWindow.Selection.WholeStory();
            WordDoc.ActiveWindow.Selection.Copy();
            
            IntPtr hwnd = ClsWindows.FindWindow(null, WordDoc.Name + " - Microsoft Word");
            try
            {
                if (ClsWindows.OpenClipboard(hwnd))
                {
                    IntPtr data = ClsWindows.GetClipboardData(14);
                    if (data != IntPtr.Zero)
                    {
                        using (Metafile mf = new Metafile(data, true))
                        {
                            int w = mf.Width;
                            int h = mf.Height;
                            int maxh = 1000;
                            float r = (float)(w * 1.0 / h);
                            if (h > maxh)
                            {
                                 
                                h = maxh;
                                w = (int)(h * r);
                            }
                            int maxw = 600;
                            if (w > maxw)
                            {                                
                                 w = maxw;
                                h= (int)(w / r);
                            }
                            

                            b = new Bitmap( w, h);
                            Graphics g =Graphics.FromImage(b) ;
                            g.Clear(Color.White);
                            g.DrawImage(mf, 0, 0); 

                            b.Save(@"D:\web\" + System.Guid.NewGuid() + ".jpeg", System.Drawing.Imaging.ImageFormat.Jpeg  ); ;
                        }
                    }
                }
            }
            finally { ClsWindows.CloseClipboard(); }
            return b;
        }

其中ClsWindows类是定义来封装API函数的

 public class ClsWindows
    {
        [DllImport("User32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool OpenClipboard(IntPtr hWndNewOwner);
        [DllImport("User32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool CloseClipboard();
        [DllImport("User32.dll")]
        public static extern IntPtr GetClipboardData(System.UInt32 uFormat);
        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        [DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);
        [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern int SendMessage(IntPtr hwnd, uint wMsg, int wParam, int lParam);
        [DllImport("user32.dll", EntryPoint = "SetForegroundWindow", SetLastError = true)]
        private static extern void SetForegroundWindow(IntPtr hwnd);
        [DllImport("user32.dll", EntryPoint = "GetMenu")]
        public static extern int GetMenu(int hwnd);
        [DllImport("user32.dll", EntryPoint = "GetSubMenu")]
        public static extern int GetSubMenu(int hMenu, int nPos);
        [DllImport("user32.dll", EntryPoint = "GetMenuItemID")]
        public static extern int GetMenuItemID(int hMenu, int nPos);
        [DllImport("user32.dll", EntryPoint = "PostMessage")]
        public static extern int PostMessage(int hwnd, int wMsg, int wParam, int lParam);
        public  const int WM_COMMAND = 0x111;        
    }