求高效截屏和分块代码

Question

目前用的DC，BitBlt 方法 截一屏将近160MS 分块也差不多160MS（4*4）分块代码:                       graphic.DrawImage(im, 0, 0, new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
                        //从作图区生成新图
                        IntPtr pr = bitmap.GetHbitmap();
                        Image MyImage = Image.FromHbitmap(pr);
                        DeleteObject(pr);
                        //
                        byte[] tmpbyte = CompressByte(imageToByteArray(MyImage));//转换为字节压缩。
在另外一台17寸电脑上操作更是消耗 860MS。求高效方法，DirecxX ，差异截图 等方法

Answer 1

http://topic.csdn.net/u/20090911/14/5614a16e-ab08-4106-901e-e8dcc5cd1fa3.html?8513

Answer 2

类库自带的 g.CopyFromScreen( 跟上面的效率差不多。

Answer 3

使用 DirectX 截图 GetFrontBufferData(0, mySurface)  应用程序错误。。

Answer 4

 Microsoft.DirectX.Direct3D.Device myDevice;
          
            PresentParameters presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.AutoDepthStencilFormat = DepthFormat.D16;            presentParams.SwapEffect = SwapEffect.Discard;
            presentParams.PresentFlag = PresentFlag.LockableBackBuffer;
            presentParams.BackBufferWidth = 1280;
            presentParams.BackBufferHeight = 800;
            presentParams.MultiSample = MultiSampleType.None;
            presentParams.BackBufferCount = 1;
            //   presentParams.DeviceWindowHandle = this.Handle;
            for (int i = 0; i < 100; i++)
            {
                               string datetime = DateTime.Now.ToString("HH:mm:ss:ff");
                myDevice = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);
                Surface mySurface = myDevice.CreateOffscreenPlainSurface(1280, 800, Format.A8R8G8B8, Pool.SystemMemory);
                try
                {
                    myDevice.GetFrontBufferData(0, mySurface); //copy frontsurface to mySurface                    Microsoft.DirectX.GraphicsStream gStr = Microsoft.DirectX.Direct3D.SurfaceLoader.SaveToStream(ImageFileFormat.Bmp, mySurface);
                    // pictureBox1.Image = Bitmap.FromStream(gStr);
                    Bitmap screen = new Bitmap(Bitmap.FromStream(gStr));
                    gStr.Dispose();
                    mySurface.Dispose();
                }
                catch (Exception ee)
                {
                    Tools.Trace(ee.ToString());
                    mySurface.Dispose();
                }
                string datetime2 = DateTime.Now.ToString("HH:mm:ss:ff");
                           }
使用的DX，速度也差不多 = =。请问是哪的使用问题吗

Answer 5

 Image deskImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format24bppRgb);
                Graphics deskG = Graphics.FromImage(deskImage);
                deskG.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.PrimaryScreen.Bounds.Size);                Rectangle targRect = new Rectangle(0, 0,640, 480);
                Image baseImage = new Bitmap(640, 480, PixelFormat.Format24bppRgb);
                Graphics baseG = Graphics.FromImage(baseImage);
                baseG.DrawImage(deskImage, targRect, new Rectangle(0, 0, deskImage.Width, deskImage.Height), GraphicsUnit.Pixel);

Answer 6

graphic.DrawImage(im, 0, 0, new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
  //从作图区生成新图
  IntPtr pr = bitmap.GetHbitmap();
  Image MyImage = Image.FromHbitmap(pr);
  DeleteObject(pr);-------------------
graphic.DrawImage(im, 0, 0, new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
Image MyImage =bitmap;
bitmap.dispose; '释放截屏可用:
graphic.CopyFromScreen(..)

Answer 7

上面的释放方式运行段时间就会出错。
CopyFromScreen()效果和API差不多。。

Answer 8

http://topic.csdn.net/u/20090911/14/5614a16e-ab08-4106-901e-e8dcc5cd1fa3.html?44754