uwp之拍照(使用后置摄像头)
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uwp开启摄像头要借助CaptureElement呈现来自捕获设备(如照相机或网络摄像机)的流。今天讲讲如何打开摄像头,获取焦点,以及拍照。废话不多说,下面直接上代码。当然前提是一定要记住在appxmanifest文件Capabilities选项选择Webcam,不然会报错
首先 XAML代码:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> <Grid> <CaptureElement x:Name="capturePreview" Stretch="UniformToFill" /> <Image Name="ProfilePic" /> </Grid> <StackPanel VerticalAlignment="Bottom"> <Slider x:Name="FocusValueSlider" Margin="12,0,15,0" Header="焦点调节:" LargeChange="25" Maximum="1000" Minimum="0" SmallChange="1" ValueChanged="FocusValueSlider_ValueChanged" Value="500" /> <StackPanel Orientation="Horizontal"> <Button Click="PhotographButton_Click" Content="启动摄像头" /> <Button Margin="50,0,0,0" Click="CapturePhoto_Click" Content="拍照" /> </StackPanel> </StackPanel> </Grid>
//启动摄像头 async private void PhotographButton_Click(object sender, RoutedEventArgs e) { if (captureManager == null) { capturePreview.Visibility = Visibility.Visible; ProfilePic.Visibility = Visibility.Collapsed; captureManager = new MediaCapture(); //选择后置摄像头 var cameraDevice = await FindCameraDeviceByPanelAsync(Windows.Devices.Enumeration.Panel.Back); if (cameraDevice == null) { System.Diagnostics.Debug.WriteLine("No camera device found!"); return; } var settings = new MediaCaptureInitializationSettings { StreamingCaptureMode = StreamingCaptureMode.Video, //MediaCategory = MediaCategory.Other, //AudioProcessing = AudioProcessing.Default, //PhotoCaptureSource = PhotoCaptureSource.Photo, AudioDeviceId = string.Empty, VideoDeviceId = cameraDevice.Id }; await captureManager.InitializeAsync(settings); //摄像头旋转90度 //captureManager.SetPreviewRotation(VideoRotation.Clockwise90Degrees); capturePreview.Source = captureManager; await captureManager.StartPreviewAsync(); } } private static async Task<DeviceInformation> FindCameraDeviceByPanelAsync(Windows.Devices.Enumeration.Panel desired) { var allVideoDevices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture); DeviceInformation desiredDevice = allVideoDevices.FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == desired); return desiredDevice ?? allVideoDevices.FirstOrDefault(); } //拍照 async private void CapturePhoto_Click(object sender, RoutedEventArgs e) { if (captureManager != null) { capturePreview.Visibility = Visibility.Collapsed; ProfilePic.Visibility = Visibility.Visible; ProfilePic.Source = null; //declare string for filename string captureFileName = string.Empty; //图片格式 ImageEncodingProperties format = ImageEncodingProperties.CreateJpeg(); //创建本地存储文件夹 StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync( "Photo"+DateTime.Now.ToString("yyMMddHHmmss")+".jpg", CreationCollisionOption.ReplaceExisting); await captureManager.CapturePhotoToStorageFileAsync(format, file); BitmapImage bmpImage = new BitmapImage(new Uri(file.Path)); ProfilePic.Source = bmpImage;//释放摄像头资源 capturePreview.Visibility = Visibility.Visible; ProfilePic.Visibility = Visibility.Collapsed; //captureManager.Dispose(); //captureManager = null; } } private void FocusValueSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e) { try { uint focus = Convert.ToUInt32(e.NewValue); SetFocus(focus); } catch { } } //设置摄像头焦点方法 private async void SetFocus(uint? focusValue = null) { try { if (!focusValue.HasValue) { focusValue = 500; } if (captureManager.VideoDeviceController.FocusControl.Supported) { captureManager.VideoDeviceController.FlashControl.AssistantLightEnabled = false; captureManager.VideoDeviceController.FocusControl.Configure(new FocusSettings() { Mode = FocusMode.Manual, Value = focusValue, DisableDriverFallback = true }); await captureManager.VideoDeviceController.FocusControl.FocusAsync(); } } catch { } }
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