C# Imaging.JpegBitmapEncoder类代码示例

        private void Clicked(object sender, RoutedEventArgs e)
        {
            var result = Clipboard.GetImage();
            if (result == null)
            {
                MessageBox.Show("No image");
                return;
            }

            var directorypath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Screendumps");
            var filePath = Path.GetFileNameWithoutExtension(Path.GetRandomFileName()) + ".jpg";

            var directory = new DirectoryInfo(directorypath);
            if (!directory.Exists)
            {
                directory.Create();
            }

            using (var stream = new FileStream(Path.Combine(directorypath,filePath), FileMode.Create))
            {
                var encode = new JpegBitmapEncoder();
                encode.QualityLevel = 100;
                encode.Frames.Add(BitmapFrame.Create(result));
                encode.Save(stream);
            }

            Clipboard.SetText(Path.Combine(directorypath,filePath));
        }

 public static void ToImageFile(this Visual theVisual, string fileName)
 {
     BitmapEncoder encoder;
     switch (Path.GetExtension(fileName).ToLower())
     {
         case ".jpg":
         case ".jpeg":
             encoder = new JpegBitmapEncoder();
             break;
         case ".png":
             encoder = new PngBitmapEncoder();
             break;
         case ".bmp":
             encoder = new BmpBitmapEncoder();
             break;
         case ".gif":
             encoder = new GifBitmapEncoder();
             break;
         case ".tiff":
             encoder = new TiffBitmapEncoder();
             break;
         default:
             throw new EncoderFallbackException("The Specified Filename is not a known image type.  Supported image formats are jpeg, png, bmp, gif, and tiff.");
     }
     encoder.Frames.Add(BitmapFrame.Create(theVisual.ToBitmapSource()));
     using (var stream = new FileStream(fileName, FileMode.Create)) encoder.Save(stream);
 }

        /// <summary>
        /// Saves the full chart to a file, including technical analysis.
        /// </summary>
        /// <param name="filename">The file to write to.</param>
        public void SaveAsImage(string filename)
        {
            if (string.IsNullOrEmpty(filename))
                throw new ArgumentNullException();

            var extension = Path.GetExtension(filename);
            if (string.IsNullOrEmpty(extension))
                throw new ArgumentNullException();

            BitmapEncoder bitmapEncoder;
            extension = extension.ToLower();
            if (extension == ".png")
                bitmapEncoder = new PngBitmapEncoder();
            else if (extension == ".jpg" || extension == ".jpeg")
                bitmapEncoder = new JpegBitmapEncoder();
            else if (extension == ".gif")
                bitmapEncoder = new GifBitmapEncoder();
            else if (extension == ".bmp")
                bitmapEncoder = new BmpBitmapEncoder();
            else throw new ArgumentException("Cannot find a BitmapEncoder for this file type.");

            var renderTargetBitmap = new RenderTargetBitmap((int)this.ActualWidth, (int)this.ActualHeight, 96, 96, PixelFormats.Pbgra32);

            foreach (var child in LogicalTreeHelper.GetChildren(this))
            {
                if (child is ChartPanel)
                    renderTargetBitmap.Render((ChartPanel)child);
            }

            bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
            using (Stream stream = File.Create(filename))
            {
                bitmapEncoder.Save(stream);
            }
        }

 public int AddMedium(string name, object obj)
 {
     var media = db.CreateObject<medium>();
     if (name == "Image")
     {
         byte[] img;
         JpegBitmapEncoder encoder = new JpegBitmapEncoder();
         encoder.Frames.Add(BitmapFrame.Create(obj as BitmapSource));
         using (MemoryStream ms = new MemoryStream())
         {
             encoder.Save(ms);
             img = ms.ToArray();
         }
         media.media_type_id = 1;
         [email protected] = img;
     }
     else if (name == "Movie")
     {
         media.media_type_id = 2;
         [email protected] = System.Text.Encoding.UTF8.GetBytes(obj as string);
     }
     else
     {
         media.media_type_id = 3;
         //BinaryFormatter bf = new BinaryFormatter();
         //MemoryStream ms = new MemoryStream();
         //bf.Serialize(ms, obj);
         //[email protected] = ms.ToArray();
         [email protected] = System.Text.Encoding.UTF8.GetBytes(obj as string);
     }
     db.media.AddObject(media);
     db.SaveChanges();
     return (int)media.id;
 }

        /// <summary>
        /// Exports the specified viewport.
        /// </summary>
        /// <param name="viewport">
        /// The viewport.
        /// </param>
        public void Export(Viewport3D viewport)
        {
            int m = this.OversamplingMultiplier;

            var background = this.Background;
            if (background == null)
            {
                background = Brushes.Transparent;
            }

            var bmp = Viewport3DHelper.RenderBitmap(viewport, background, m);
            BitmapEncoder encoder;
            string ext = Path.GetExtension(this.FileName);
            switch (ext.ToLower())
            {
                case ".jpg":
                    var jpg = new JpegBitmapEncoder();
                    jpg.Frames.Add(BitmapFrame.Create(bmp));
                    encoder = jpg;
                    break;
                case ".png":
                    var png = new PngBitmapEncoder();
                    png.Frames.Add(BitmapFrame.Create(bmp));
                    encoder = png;
                    break;
                default:
                    throw new InvalidOperationException("Not supported file format.");
            }

            using (Stream stm = File.Create(this.FileName))
            {
                encoder.Save(stm);
            }
        }

        public static void SaveAsImage(FrameworkElement visual)
        {
            Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
            dlg.DefaultExt = ".png";
            dlg.Filter = "PNG Image (.png)|*.png|JPEG Image (.jpg)|*.jpg";

            if (dlg.ShowDialog().Value)
            {
                BitmapSource img = (BitmapSource)ToImageSource(visual);

                FileStream stream = new FileStream(dlg.FileName, FileMode.Create);
                BitmapEncoder encoder = null; // new BitmapEncoder();

                if (dlg.SafeFileName.ToLower().EndsWith(".png"))
                {
                    encoder = new PngBitmapEncoder();
                }
                else
                {
                    encoder = new JpegBitmapEncoder();
                }

                encoder.Frames.Add(BitmapFrame.Create(img));
                encoder.Save(stream);
                stream.Close();
            }
        }

        public static void Save(this BitmapSource image, string filePath, ImageFormat format)
        {
            BitmapEncoder encoder = null;
            
            switch(format)
            {
                case ImageFormat.Png:
                    encoder = new PngBitmapEncoder();
                    break;
                case ImageFormat.Jpeg:
                    encoder = new JpegBitmapEncoder();
                    break;
                case ImageFormat.Bmp:
                    encoder = new BmpBitmapEncoder();
                    break;
            }

            if (encoder == null) 
                return;

            encoder.Frames.Add(BitmapFrame.Create(BitmapFrame.Create(image)));

            using (var stream = new FileStream(filePath, FileMode.Create))
                encoder.Save(stream);
        }

        // Handles save image click
        private void OnSaveImageClick(object sender, RoutedEventArgs e)
        {
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Filter = "24-bit Bitmap (*.bmp)|*.bmp|JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|GIF (*.gif)|*.gif|PNG (*.png)|*.png";
            dlg.FilterIndex = 4;
            bool? dlgResult = dlg.ShowDialog(Window.GetWindow(this));
            if(dlgResult.HasValue && dlgResult.Value)
            {
                Visualizer visualizer = Visualizer;
                RenderTargetBitmap bitmap = new RenderTargetBitmap((int)previewPage.PageWidth, (int)previewPage.PageHeight, 96, 96, PixelFormats.Pbgra32);

                visualizer.RenderTo(bitmap);

                BitmapEncoder encoder = null;
                string ext = System.IO.Path.GetExtension(dlg.FileName);
                if (ext == "bmp") encoder = new BmpBitmapEncoder();
                else if ((ext == "jpg") || (ext == "jpeg")) encoder = new JpegBitmapEncoder();
                else encoder = new PngBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(bitmap));
                using (FileStream stream = new FileStream(dlg.FileName, FileMode.Create, FileAccess.Write))
                {
                    encoder.Save(stream);
                    stream.Flush();
                }
            }
        }

        public static BitmapImage Bitmap2BitmapImage(Bitmap bitmap)
        {
            IntPtr hBitmap = bitmap.GetHbitmap();
            BitmapImage res =new BitmapImage();

            try
            {
               BitmapSource retval = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                             hBitmap,
                             IntPtr.Zero,
                             Int32Rect.Empty,
                             BitmapSizeOptions.FromEmptyOptions());
                JpegBitmapEncoder encoder = new JpegBitmapEncoder();
                MemoryStream memoryStream = new MemoryStream();
                encoder.Frames.Add(BitmapFrame.Create(retval));
                encoder.Save(memoryStream);



               res.BeginInit();
               res.StreamSource = new MemoryStream(memoryStream.ToArray());
               res.EndInit();
            }
            finally
            {
                DeleteObject(hBitmap);
            }

            return res;
      }

 public void Save(BitmapSource bmSource)
 {
     BitmapEncoder encoder;
     switch (Path.GetExtension(_path).ToLower())
     {
         case ".jpg":
         case ".jpeg":
             encoder = new JpegBitmapEncoder();
             break;
         case ".gif":
             encoder = new GifBitmapEncoder();
             break;
         case ".bmp":
             encoder = new BmpBitmapEncoder();
             break;
         case ".tif":
         case ".tiff":
             encoder = new TiffBitmapEncoder();
             break;
         case ".png":
             encoder = new PngBitmapEncoder();
             break;
         default:
             throw new ArgumentException("Wrong path");
     }
     encoder.Frames.Add(BitmapFrame.Create(bmSource));
     Stream stm = File.Create(_path);
     encoder.Save(stm);
     stm.Dispose();
 }

        public void CustomeColorizer(string saveLocation, List<Colorizer> colorpalette)
        {
            if (_data == null)
                throw new InvalidDataException("You must Solve the case First!");

            if (colorpalette.Count <= 1)
                throw new InvalidDataException("You must choose at least 2 Colors");

            PixelFormat pf = PixelFormats.Rgb24;
            const double dpi = 96;
            int rawStride = (_width*pf.BitsPerPixel + 7)/8;
            var pixelData = new byte[rawStride*_height];

            foreach (Colorizer colorizer in colorpalette)
            {
                for (int i = 0; i < _data.Length; i++)
                {
                    if (Helper.IsInBetween(_data[i], colorizer.Min, colorizer.Max))
                    {
                        SetPixel((i%_width), (i/_width), colorizer.Color, ref pixelData, rawStride);
                    }
                }
            }

            BitmapSource bitmap = BitmapSource.Create(_width, _height, dpi, dpi, pf, null, pixelData, rawStride);

            var stream = new FileStream(saveLocation, FileMode.Create);
            var encoder = new JpegBitmapEncoder {QualityLevel = 100};
            encoder.Frames.Add(BitmapFrame.Create(bitmap));
            encoder.Save(stream);
            stream.Close();
        }

        private static BitmapEncoder GetBitmapEncoder(ImageContentType imageContentType)
        {
            BitmapEncoder bitmapEncoder;

            switch (imageContentType)
            {
                case ImageContentType.ImageBmpContentType:
                    bitmapEncoder = new BmpBitmapEncoder();
                    break;
                case ImageContentType.ImageGifContentType:
                    bitmapEncoder = new GifBitmapEncoder();
                    break;
                case ImageContentType.ImageJpegContentType:
                    bitmapEncoder = new JpegBitmapEncoder();
                    break;
                case ImageContentType.ImageTiffContentType:
                    bitmapEncoder = new TiffBitmapEncoder();
                    break;
                case ImageContentType.ImagePngContentType:
                    bitmapEncoder = new PngBitmapEncoder();
                    break;
                default:
                    bitmapEncoder = new PngBitmapEncoder();
                    break;
            }
            return bitmapEncoder;
        }

        /// <summary>
        /// Store into the compiled folder the user photo used to retrieve user information
        /// </summary>
        /// <param name="faceImageSource">face image source</param>
        /// <param name="imageFileName">face image name</param>
        /// <returns>1 if store success, 0 otherwise</returns>
        public static int SaveUserImage(BitmapSource faceImageSource, string imageFileName)
        {
            int resultCode = 1;

            if (File.Exists(imageFileName))
            {
                File.Delete(imageFileName);
            }

            using (FileStream saveSnapshotStream = new FileStream(imageFileName, FileMode.CreateNew))
            {
                try
                {
                    JpegBitmapEncoder jpgEncoder = new JpegBitmapEncoder();
                    jpgEncoder.QualityLevel = 100;
                    jpgEncoder.Frames.Add(BitmapFrame.Create(faceImageSource));
                    jpgEncoder.Save(saveSnapshotStream);

                    saveSnapshotStream.Flush();
                    saveSnapshotStream.Close();
                    saveSnapshotStream.Dispose();
                }
                catch (Exception e)
                {
                     resultCode = 0;
                }
            }

            return resultCode;
        }

        /// <summary>
        /// Sets wallpaper and style
        /// WinowsAPI Call
        /// </summary>
        /// <param name="image"></param>
        /// <param name="style"></param>
        public static void SetWallPaper(BitmapImage image, Style style)
        {
            if (image != null)
            {
                string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper");

                //image.Save(tempPath, System.Drawing.Imaging.ImageFormat.Jpeg)
                JpegBitmapEncoder encoder = new JpegBitmapEncoder();

                try
                {
                    encoder.Frames.Add(BitmapFrame.Create(image));
                }
                catch { }

                using(Stream fs = new FileStream(tempPath, FileMode.Create))
                {
                    encoder.Save(fs);
                }

                SetWallPaperStyle(style);

                //Win API Call
                SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, tempPath, SPIF_UPDATEINIFILE | SPIF_SENDWINIINICHANGE);
            }
        }

 /// <summary>
 /// </summary>
 /// <param name="source"> </param>
 /// <param name="scale"> </param>
 /// <param name="quality"> </param>
 /// <returns> </returns>
 public static byte[] GetJpgImage(UIElement source, double scale, int quality)
 {
     var actualHeight = source.RenderSize.Height;
     var actualWidth = source.RenderSize.Width;
     var renderHeight = actualHeight * scale;
     var renderWidth = actualWidth * scale;
     var renderTarget = new RenderTargetBitmap((int) renderWidth, (int) renderHeight, 96, 96, PixelFormats.Pbgra32);
     var sourceBrush = new VisualBrush(source);
     var drawingVisual = new DrawingVisual();
     var drawingContext = drawingVisual.RenderOpen();
     using (drawingContext)
     {
         drawingContext.PushTransform(new ScaleTransform(scale, scale));
         drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), new Point(actualWidth, actualHeight)));
     }
     renderTarget.Render(drawingVisual);
     var jpgEncoder = new JpegBitmapEncoder
     {
         QualityLevel = quality
     };
     jpgEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
     Byte[] imageArray;
     using (var outputStream = new MemoryStream())
     {
         jpgEncoder.Save(outputStream);
         imageArray = outputStream.ToArray();
     }
     return imageArray;
 }