bitmapimage

问题 I am creating a byte array with arbitrary values in it and want to convert it into a BitmapImage. bi = new BitmapImage(); using (MemoryStream stream = new MemoryStream(data)) { try { bi.BeginInit(); bi.CacheOption = BitmapCacheOption.OnLoad; bi.StreamSource = stream; bi.DecodePixelWidth = width; bi.EndInit(); } catch (Exception ex) { return null; } } This code gives me a NotSupportedException all the time. How could I create a BitmapSource from any byte array? 回答1: Given an array of bytes

问题 I have a HBITMAP in my pure Win32 project (no external libraries are used). Can I export it to a *.bmp file using only Winapi and/or CRT functions so I don\'t incur any extra dependencies? 回答1: There is no API to save into file directly because, generally, having a bitmap handle does not mean you have direct access to bitmap data. Your solution is to copy bitmap into another bitmap with data access (DIB) and then using it data to write into file. You typically either create another bitmap

问题 I have a BitmapImage that I\'m using in a WPF application, I later want to save it to a database as a byte array (I guess it\'s the best way), how can I perform this conversion? Or, alternatively, is there a better way to save a BitmapImage (or any of its base classes, BitmapSource or ImageSource ) to a data repository? 回答1: To convert to a byte[] you can use a MemoryStream: byte[] data; JpegBitmapEncoder encoder = new JpegBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bitmapImage));

问题 I use: Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute)) bmi.CacheOption = BitmapCacheOption.OnLoad this does not Use OnLoad And file still is locked to overwrite on harddisk. Any idea how to unlock? Regards 回答1: As shown in the question you link to, you'd need to call BeginInit and EndInit, like so as well as set the UriSource property: Dim bmi As New BitmapImage() bmi.BeginInit() bmi.CacheOption = BitmapCacheOption.OnLoad bmi.UriSource = New Uri(fiInfo.FullName, UriKind

问题 I\'m going to convert array of bytes to System.Windows.Media.Imaging.BitmapImage and show the BitmapImage in an image control. When I\'m using the first code, noting happens! no error and no image is displayed. But when I\'m using the second one it works fine! can anyone say what is going on? first code is here: public BitmapImage ToImage(byte[] array) { using (System.IO.MemoryStream ms = new System.IO.MemoryStream(array)) { BitmapImage image = new BitmapImage(); image.BeginInit(); image

问题 I am working on a program that downloads images from a URL to a bitmapimageand displays it. Next I try to save the bitmapimage to the harddrive using jpegbitmapencoder. The file is successfully created but the actual jpeg image is empty or 1 black pixel. public Guid SavePhoto(string istrImagePath) { ImagePath = istrImagePath; BitmapImage objImage = new BitmapImage( new Uri(istrImagePath, UriKind.RelativeOrAbsolute)); PictureDisplayed.Source = objImage; savedCreationObject = objImage; Guid

问题 Is an SVG image purely vectorial or can we combine bitmap images into an SVG image ? How about transforms applied on the bitmap images (perspective, mappings, etc.) ? Edit : Images may be included in an SVG by link reference. See http://www.w3.org/TR/SVG/struct.html#ImageElement. My question was in fact if bitmap images may be included inside the svg so that the svg image would be self contained. Otherwise, whenever the svg image is displayed the link must be followed and the image downloaded

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . In my project I need to store an image into a sqlite database and also need to retrieve it to show in my android emulator. When I show it directly after decoding the encoded string, which I got from Java class