//            nCmdShow的含义
        //0 关闭窗口
        //1 正常大小显示窗口
        //2 最小化窗口
        //3 最大化窗口
        //使用实例: ShowWindow(myPtr, 0);
        #endregion

        /// <summary>
        /// 根据窗口HWND截取窗口
        /// </summary>
        /// <param name="handle"></param>
        /// <returns></returns>
        public static Image GetWindowCapture(IntPtr handle)
        {
                        // get te hDC of the target window  
                        IntPtr hdcSrc = GetWindowDC(handle);

            ShowWindow(hdcSrc, 1);
                        // get the size  
                        SC_RECT windowRect = new SC_RECT();

            GetWindowRect(handle, ref windowRect);
            int width  = windowRect.right - windowRect.left;
            int height = windowRect.bottom - windowRect.top;
                        // create a device context we can copy to  
                        IntPtr hdcDest = CreateCompatibleDC(hdcSrc);
                        // create a bitmap we can copy it to,  
                        // using GetDeviceCaps to get the width/height  
                        IntPtr hBitmap = CreateCompatibleBitmap(hdcSrc, width, height);
                        // select the bitmap object  
                        IntPtr hOld = SelectObject(hdcDest, hBitmap);
                        // bitblt over  
                        BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, SRCCOPY | CAPTUREBLT);
                        // restore selection  
                        SelectObject(hdcDest, hOld);
                        // clean up   
                        DeleteDC(hdcDest);

            ReleaseDC(handle, hdcSrc);
                        // get a .NET image object for it  
                        Image img = Image.FromHbitmap(hBitmap);
                        // free up the Bitmap object  
                        DeleteObject(hBitmap);

            return(img);
        }
 public static extern IntPtr GetWindowRect(IntPtr hWnd, ref SC_RECT rect);