C# System.Drawing.Bitmap.GetPropertyItem方法代码示例

        public AnimationGif(string strImagePath)
        {
            Stream stmImage;
            this.decAnimationGif = ImageProcessing.CreateGifBitmapDecoderFromResource(strImagePath, out stmImage);

            stmImage.Seek(0, SeekOrigin.Begin);
            var tmpImage = new System.Drawing.Bitmap(stmImage);
            var piFrameDelay = tmpImage.GetPropertyItem(0x5100);
            this.arrDelays = new int[this.decAnimationGif.Frames.Count];
            for (int i = 0; i < this.arrDelays.Length; i++) {
                this.arrDelays[i] = BitConverter.ToInt32(piFrameDelay.Value, i * 4) * 10;
            }
            var piLoopCount = tmpImage.GetPropertyItem(0x5101);
            this.nLoop = BitConverter.ToInt16(piLoopCount.Value, 0);
            this.nLoopRemain = this.nLoop;

            BitmapFrame frame = this.decAnimationGif.Frames.First();
            this.imgFrame = new Image();
            this.imgFrame.Source = frame;
            this.imgFrame.Stretch = Stretch.None;
            this.imgFrame.Width = frame.PixelWidth;
            this.imgFrame.Height = frame.PixelHeight;

            this.timerInterval = new DispatcherTimer();
            this.timerInterval.Interval = new TimeSpan(0, 0, 0, 0, this.arrDelays[0]);
            this.timerInterval.Tick += new EventHandler(AnimationHandler);
            this.timerInterval.Start();
        }

        /// <summary>
        /// Creates an animated gif shape.  
        /// Do not add a very large number of these or performance may be degraded.
        /// </summary>
        /// <param name="imageName">
        /// The animated gif file (local or network) to load.
        /// </param>
        /// <param name="repeat">
        /// Continuously repeat the animation "True" or "False".
        /// </param>
        /// <returns>
        /// The animated gif shape name.
        /// </returns>
        public static Primitive AddAnimatedGif(Primitive imageName, Primitive repeat)
        {
            if (((string)imageName).StartsWith("http")) imageName = Network.DownloadFile(imageName);
            GraphicsWindow.Show();
            Type ShapesType = typeof(Shapes);
            Canvas _mainCanvas;
            string shapeName;

            try
            {
                MethodInfo method = GraphicsWindowType.GetMethod("VerifyAccess", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.IgnoreCase);
                method.Invoke(null, new object[] { });

                method = ShapesType.GetMethod("GenerateNewName", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.IgnoreCase);
                shapeName = method.Invoke(null, new object[] { "Image" }).ToString();

                _mainCanvas = (Canvas)GraphicsWindowType.GetField("_mainCanvas", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.IgnoreCase).GetValue(null);

                InvokeHelperWithReturn ret = new InvokeHelperWithReturn(delegate
                {
                    try
                    {
                        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(imageName);
                        System.Drawing.Imaging.FrameDimension fd = new System.Drawing.Imaging.FrameDimension(bitmap.FrameDimensionsList[0]);
                        int frameCount = bitmap.GetFrameCount(fd);

                        if (frameCount > 1)
                        {
                            Animated anim = new Animated();
                            animated.Add(anim);
                            anim.name = shapeName;
                            anim.frames = new Frame[frameCount];
                            anim.repeat = repeat;

                            //0x5100 is the property id of the GIF frame's durations
                            //this property does not exist when frameCount <= 1
                            byte[] times = bitmap.GetPropertyItem(0x5100).Value;

                            for (int i = 0; i < frameCount; i++)
                            {
                                //selects GIF frame based on FrameDimension and frameIndex
                                bitmap.SelectActiveFrame(fd, i);

                                //length in milliseconds of display duration
                                int length = BitConverter.ToInt32(times, 4 * i) * 10;

                                System.IO.MemoryStream stream = new System.IO.MemoryStream();
                                new System.Drawing.Bitmap(bitmap).Save(stream, System.Drawing.Imaging.ImageFormat.Png);

                                BitmapImage bi = new BitmapImage();
                                bi.BeginInit();
                                bi.StreamSource = stream;
                                bi.EndInit();

                                anim.frames[i] = new Frame(length, bi);
                            }

                            Image shape = new Image();
                            shape.Source = anim.frames[0].bi;
                            shape.Stretch = Stretch.Fill;
                            shape.Name = shapeName;
                            shape.Width = shape.Source.Width;
                            shape.Height = shape.Source.Height;
                            anim.shape = shape;

                            if (null == animationTimer)
                            {
                                animationTimer = new System.Windows.Forms.Timer();
                                animationTimer.Enabled = animationInterval > 0;
                                if (animationInterval > 0) animationTimer.Interval = animationInterval;
                                animationTimer.Tick += new System.EventHandler(animation_Tick);
                            }

                            _objectsMap[shapeName] = shape;
                            _mainCanvas.Children.Add(shape);
                            return shapeName;
                        }
                        return "";
                    }
                    catch (Exception ex)
                    {
                        Utilities.OnError(Utilities.GetCurrentMethod(), ex);
                        return "";
                    }
                });
                return FastThread.InvokeWithReturn(ret).ToString();
            }
//.........这里部分代码省略.........

        DateTime getDateTaken(string filePath)
        {
            // Load an image however you like.
            System.Drawing.Image image = new System.Drawing.Bitmap(filePath);
            // Get the Date Created property
            System.Drawing.Imaging.PropertyItem propItem = null;
            try
            {
                propItem = image.GetPropertyItem(0x9003);
            }
            catch
            {
            }

            image.Dispose();

            if (propItem != null)
            {
                // Extract the property value (a string).
                var encoding = new System.Text.ASCIIEncoding();
                string text = encoding.GetString(propItem.Value, 0, propItem.Len - 1);

                // Parse the date and time.
                System.Globalization.CultureInfo provider = System.Globalization.CultureInfo.InvariantCulture;
                return DateTime.ParseExact(text, "yyyy:MM:d H:m:s", provider);
            }

            return new DateTime(0);
        }

 private Stream ReadGifData(Stream inkdata)
 { 
     // Read the GIF header ... 
     System.Drawing.Bitmap img = new System.Drawing.Bitmap(inkdata);
     // Read the comment as that is where the ISF is stored... 
     // for reference the tag is PropertyTagExifUserComment [0x9286] or 37510 (int)
     System.Drawing.Imaging.PropertyItem piComment = img.GetPropertyItem(37510);
     return new MemoryStream(piComment.Value);
 }