writeablebitmap

来源： https://stackoverflow.com/questions/22830700/c-sharp-stream-writeablebitmap-among-multiple-threads

来源： https://stackoverflow.com/questions/22830700/c-sharp-stream-writeablebitmap-among-multiple-threads

来源： https://stackoverflow.com/questions/6096979/writeablebitmap-access-violation-problem

问题 How to save a WriteableBitmap to localfolder using C# in WinRT? 回答1: You can check WinRT XAML Toolkit for a set of extension methods to do exactly what you need: http://winrtxamltoolkit.codeplex.com/SourceControl/changeset/view/0657c67a93d5#WinRTXamlToolkit%2fImaging%2fWriteableBitmapSaveExtensions.cs 回答2: Here are bits and pieces of the answer var bitmap = new WriteableBitmap(width,height); var stream = bitmap.PixelBuffer.AsStream(); than you can get IOutputStream from Stream to write the

问题 Do you know any library that provides methods to draw simple shapes (lines and optionally other shapes) using WPF WriteableBitmap and ideally BackBuffer? I know that there is a WriteableBitmapEx project for silverlight but is there WPF equivalent? 回答1: I guess here is the answer to my question :) _plotBitmap.Lock(); var b = new Bitmap(_plotBitmap.PixelWidth, _plotBitmap.PixelHeight, _plotBitmap.BackBufferStride, System.Drawing.Imaging.PixelFormat.Format24bppRgb, _plotBitmap.BackBuffer); using

问题 Here is the problem. I want to open a file from local drives, then make it into a WritableBitmap so i can edit it. But the problem is, i cannot create a WritableBitmap from Uri or something like that. Also i know how to open a file into BitmapImage but i cannot figure out how to open a file as WritableBitmap. Is there way to open a file directly into a WritableBitmap,if there is not, is there a way to convert a BitmapImage to a WritableBitmap? Thanks guys. 回答1: You can load your image file

问题 I am accessing an image from a blob storage on my azure service. I am returning the uri for the image and then uses HttpClient to try and download it. The uri is verified to be correct. using (HttpClient client = new HttpClient()) { try { HttpResponseMessage response = await client.GetAsync(new Uri(((App)Application.Current).results.statsInformation.ImageBlob.ImageUri, UriKind.RelativeOrAbsolute)); if (response != null && response.StatusCode == HttpStatusCode.OK) { using (var stream = await

问题 The constructor of WriteableBitmap class with Windows 8 only takes two arguments: the height and the width of this object. Meanwhile with Silverlight it accepts a BitmapImage object as argument. (Verified on MSDN : WriteableBitmap.WriteableBitmap constructor) I would like to load this BitmapImage because I'm trying to blur an image which already exists on my Assets folder. 回答1: Thanks for your help, I succeed to blur my image. Here is the sample in order to link the BitmapImage into the

问题 I'm writing an application in WPF (C#) which does long operations on a collection of Bitmaps. To keep my application responsive, I decided to use another thread to perform the operations on bitmaps and report progress on a progressbar in main UI thread. I thought BackgroundWorker would do anything for me, but looks like it won't be that easy. I have the following code: public class ImageProcessor { public Collection<WriteableBitmap> Pictures { get; private set; } private BackgroundWorker

问题 BitmapImage bitmapImage = new BitmapImage(new Uri("arka_projects_as_logo.png", UriKind.Relative)); Image uiElement = new Image() { Source = bitmapImage }; ScaleTransform t = new ScaleTransform() { ScaleX = 0.2, ScaleY = 0.2 }; WriteableBitmap writeableBitmap = new WriteableBitmap(uiElement,t); I want to insert the result of this conversions (writeableBitmap) into System.Windows.Controls.Image. When I do this: Image arkaImage = new Image() { Source = writeableBitmap }; arkaImage isn't shown at