[UWP]如何在UWP的irandomaccessstream中添加文本？

本文介绍了[UWP]如何在UWP的irandomaccessstream中添加文本？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

这是我的功能记录ip camera。如何在我拥有的每个图像（_frameBuffer）中插入时间。当我完成记录后，我会收到一个视频，其中包含我添加到每张图片中的图片和时间。

public async void Record(byte[] _frameBuffer) { using (IRandomAccessStream stream = new InMemoryRandomAccessStream()) { await stream.WriteAsync(_frameBuffer.AsBuffer()); stream.Seek(0); var decoder = await BitmapDecoder.CreateAsync(stream); PixelDataProvider dataProvider = await decoder.GetPixelDataAsync( BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform { ScaledWidth = this.PixelWidth, ScaledHeight = this.PixelHeight }, ExifOrientationMode.RespectExifOrientation, ColorManagementMode.ColorManageToSRgb); if (this.PictureWriter != null) PictureWriter?.AddFrame(dataProvider.DetachPixelData(), (int)this.PixelWidth, (int)this.PixelHeight); stream.Dispose(); } }

我非常感谢所有人的帮助 我尝试过： 我找到了一个可以将文本插入图像的解决方案。但在我的情况下，我还没有找到解决方法。

private async void Button_Click(object sender, RoutedEventArgs e) { var picker = new FileOpenPicker(); picker.FileTypeFilter.Add(".png"); picker.FileTypeFilter.Add(".jpg"); picker.FileTypeFilter.Add(".jpeg"); var sourceFile = await picker.PickSingleFileAsync(); if (sourceFile == null) { return; } var device = CanvasDevice.GetSharedDevice(); var image = default(CanvasBitmap); using (var s = await sourceFile.OpenReadAsync()) { image = await CanvasBitmap.LoadAsync(device, s); } var offscreen = new CanvasRenderTarget( device, (float)image.Bounds.Width, (float)image.Bounds.Height, 96); using (var ds = offscreen.CreateDrawingSession()) { ds.DrawImage(image, 0, 0); ds.DrawText("Hello world", 10, 10, Colors.Blue); } var displayInformation = DisplayInformation.GetForCurrentView(); var savepicker = new FileSavePicker(); savepicker.FileTypeChoices.Add("png", new List<string> { ".png" }); var destFile = await savepicker.PickSaveFileAsync(); using (var s = await destFile.OpenAsync(FileAccessMode.ReadWrite)) { var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, s); encoder.SetPixelData( BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)offscreen.Size.Width, (uint)offscreen.Size.Height, displayInformation.LogicalDpi, displayInformation.LogicalDpi, offscreen.GetPixelBytes()); await encoder.FlushAsync(); } }

推荐答案

这是我的功能记录ip camera。如何在我拥有的每个图像（_frameBuffer）中插入时间。当我完成记录时，我得到一个包含图像的视频和我添加到每个图像的时间。 public async void Record(byte[] _frameBuffer) { using (IRandomAccessStream stream = new InMemoryRandomAccessStream()) { await stream.WriteAsync(_frameBuffer.AsBuffer()); stream.Seek(0); var decoder = await BitmapDecoder.CreateAsync(stream); PixelDataProvider dataProvider = await decoder.GetPixelDataAsync( BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform { ScaledWidth = this.PixelWidth, ScaledHeight = this.PixelHeight }, ExifOrientationMode.RespectExifOrientation, ColorManagementMode.ColorManageToSRgb); if (this.PictureWriter != null) PictureWriter?.AddFrame(dataProvider.DetachPixelData(), (int)this.PixelWidth, (int)this.PixelHeight); stream.Dispose(); } }

我非常感谢所有人的帮助 我试过的： 我找到了一个可以解决的问题将文本插入图像。但就我而言，我还没有办法解决它。

private async void Button_Click(object sender, RoutedEventArgs e) { var picker = new FileOpenPicker(); picker.FileTypeFilter.Add(".png"); picker.FileTypeFilter.Add(".jpg"); picker.FileTypeFilter.Add(".jpeg"); var sourceFile = await picker.PickSingleFileAsync(); if (sourceFile == null) { return; } var device = CanvasDevice.GetSharedDevice(); var image = default(CanvasBitmap); using (var s = await sourceFile.OpenReadAsync()) { image = await CanvasBitmap.LoadAsync(device, s); } var offscreen = new CanvasRenderTarget( device, (float)image.Bounds.Width, (float)image.Bounds.Height, 96); using (var ds = offscreen.CreateDrawingSession()) { ds.DrawImage(image, 0, 0); ds.DrawText("Hello world", 10, 10, Colors.Blue); } var displayInformation = DisplayInformation.GetForCurrentView(); var savepicker = new FileSavePicker(); savepicker.FileTypeChoices.Add("png", new List<string> { ".png" }); var destFile = await savepicker.PickSaveFileAsync(); using (var s = await destFile.OpenAsync(FileAccessMode.ReadWrite)) { var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, s); encoder.SetPixelData( BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)offscreen.Size.Width, (uint)offscreen.Size.Height, displayInformation.LogicalDpi, displayInformation.LogicalDpi, offscreen.GetPixelBytes()); await encoder.FlushAsync(); } }