/// <summary>

        /// 得到窗口截图

        /// </summary>

        /// <param name="hWnd"></param>

        /// <param name="width"></param>

        /// <param name="height"></param>

        /// <returns></returns>

        public Bitmap GetImageFromWindow(IntPtr hWnd, int width, int height)

        {

            Bitmap bitmap = null;

            IntPtr hscrdc = user32DLL.GetWindowDC(hWnd);

            IntPtr hbitmap = gdi32DLL.CreateCompatibleBitmap(hscrdc, width, height);

            IntPtr hmemdc = gdi32DLL.CreateCompatibleDC(hscrdc);

            try

            {

                DateTime dtStart = DateTime.Now;

                gdi32DLL.SelectObject(hmemdc, hbitmap);

                user32DLL.PrintWindow(hWnd, hmemdc, 0);

                bitmap = Bitmap.FromHbitmap(hbitmap);

                bool not = notAllBlack(bitmap, 500);

                int count = 0;

                while (!not)

                {

                    user32DLL.PrintWindow(hWnd, hmemdc, 0);

                    bitmap = Bitmap.FromHbitmap(hbitmap);

                    not = notAllBlack(bitmap, 500);

                    if (!not)

                    {

                        bitmap.Dispose();

                        GC.Collect();

                        Application.DoEvents();

                    }

                    count++;

                }

                DateTime dtEnd = DateTime.Now;

                TimeSpan jianju = dtEnd - dtStart;

                richTextBox1.Text += "全部都是黑" + count + ",用时:" + jianju.TotalSeconds + "秒\r\n";

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                //gdi32DLL.DeleteDC(hscrdc);//删除用过的对象

                gdi32DLL.DeleteObject(hbitmap);//删除用过的对象

                gdi32DLL.DeleteDC(hmemdc);//删除用过的对象

                gdi32DLL.ReleaseDC(hWnd, hscrdc);

            }

            return bitmap;

        }

public Bitmap GetBitmapFromDC(IntPtr hwnd, int width,int height)

        {

            IntPtr windc = user32DLL.GetDC(hwnd);//获取窗口DC

            IntPtr hDCMem = gdi32DLL.CreateCompatibleDC(windc);//为设备描述表创建兼容的内存设备描述表

            IntPtr hbitmap = gdi32DLL.CreateCompatibleBitmap(windc, width, height);

            IntPtr hOldBitmap = (IntPtr)gdi32DLL.SelectObject(hDCMem, hbitmap);

            gdi32DLL.BitBlt(hDCMem, 0, 0, width, height, windc, 0, 0, gdi32DLL.SRCCOPY);

            hbitmap = (IntPtr)gdi32DLL.SelectObject(hDCMem, hOldBitmap);

            Bitmap bitmap = Bitmap.FromHbitmap(hbitmap);

            gdi32DLL.DeleteObject(hbitmap);//删除用过的对象

            gdi32DLL.DeleteObject(hOldBitmap);//删除用过的对象

            gdi32DLL.DeleteDC(hDCMem);//删除用过的对象

            user32DLL.ReleaseDC(hwnd, windc);

            return bitmap;

        }

public Bitmap GetWindowCapture(int hWnd)

        {

            IntPtr intp; Bitmap bmp = null;



            if (hWnd == 0) { intp = Win32API.GetDesktopWindow(); } else { intp = (IntPtr)hWnd; }

            IntPtr hscrdc = Win32API.GetWindowDC(intp);IntPtr hmemdc = Win32API.CreateCompatibleDC(hscrdc);

            try

            {

                Win32API.RECT rect = new Win32API.RECT();

                Win32API.GetClientRect(intp, ref rect);

                int width = rect.right - rect.left; int height = rect.bottom - rect.top;

                MessageBox.Show(width.ToString() + "/" + height.ToString());

                this.pictureBox1.Width = width; this.pictureBox1.Height = height;

                IntPtr hbitmap = Win32API.CreateCompatibleBitmap(hscrdc, width, height);

                Win32API.SelectObject(hmemdc, hbitmap);

                Win32API.PrintWindow(intp, hmemdc, 0);

                bmp = Bitmap.FromHbitmap(hbitmap);

                //Clipboard.SetImage(bmp);

            }

            catch { }

            finally { Win32API.DeleteDC(hmemdc); Win32API.DeleteDC(hscrdc); }



            return bmp;

        }