与众不同 windows phone (42) - 8.0 相机和照片: 通过 PhotoCaptureDevice 捕获照片
与众不同 windows phone (42) - 8.0 相机和照片: 通过 PhotoCaptureDevice 捕获照片
作者：webabcd
介绍
与众不同 windows phone 8.0 之 相机和照片
- 通过 PhotoCaptureDevice 捕获照片
示例
演示 PhotoCaptureDevice（wp8）的应用
CameraAndPhoto/PhotoCaptureDeviceDemo.xaml
<phone:PhoneApplicationPage x:Class="Demo.CameraAndPhoto.PhotoCaptureDeviceDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel> <StackPanel Orientation="Horizontal"> <Canvas Width="240" Height="180" RenderTransformOrigin="0.5 0.5"> <Canvas.Background> <VideoBrush x:Name="videoBrush" /> </Canvas.Background> <Canvas.RenderTransform> <RotateTransform x:Name="rt" /> </Canvas.RenderTransform> </Canvas> <Image Name="imgPreview" Width="240" Height="180" /> </StackPanel> <StackPanel Orientation="Horizontal" Margin="0 50 0 0"> <Button Name="btnCapture" Content="照相" Click="btnCapture_Click" /> <Button Name="btnFocus" Content="自动对焦" Click="btnFocus_Click" /> </StackPanel> <TextBlock x:Name="lblMsg" TextWrapping="Wrap" Margin="0 10 0 0" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
CameraAndPhoto/PhotoCaptureDeviceDemo.xaml.cs
/* * 演示 PhotoCaptureDevice（wp8）的应用 * * 关于 PhotoCamera（wp7）的应用参见 * http://www.cnblogs.com/webabcd/archive/2012/08/13/2635698.html * http://www.cnblogs.com/webabcd/archive/2012/08/15/2639428.html * * * 注： * 需要在 manifest 中增加配置 <Capability Name="ID_CAP_ISV_CAMERA" /> <Capability Name="ID_CAP_MEDIALIB_PHOTO" /> */ using System; using System.Collections.Generic; using System.Linq; using System.Windows; using Microsoft.Phone.Controls; using Windows.Phone.Media.Capture; using Microsoft.Devices; using System.IO; using Microsoft.Xna.Framework.Media; using Microsoft.Phone; namespace Demo.CameraAndPhoto { public partial class PhotoCaptureDeviceDemo : PhoneApplicationPage { private PhotoCaptureDevice _captureDevice; public PhotoCaptureDeviceDemo() { InitializeComponent(); this.Loaded += PhotoCaptureDeviceDemo_Loaded; } private async void PhotoCaptureDeviceDemo_Loaded(object sender, RoutedEventArgs e) { // 一些概述类的说明 Summary(); // 是否有后置摄像头 if (PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back)) { // 获取后置摄像头照相时的可用分辨率 IReadOnlyList<Windows.Foundation.Size> supportedResolutions = PhotoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back); Windows.Foundation.Size resolution = supportedResolutions[0]; try { // 让后置摄像头以指定的分辨率捕获镜头内容 _captureDevice = await PhotoCaptureDevice.OpenAsync(CameraSensorLocation.Back, resolution); /* * SetCaptureResolutionAsync() - 设置捕获照片的分辨率 * SetPreviewResolutionAsync() - 设置捕获照片的预览图的分辨率 * CaptureResolution - 获取当前捕获的分辨率 * PreviewResolution - 获取当前捕获的预览图的分辨率 * FocusRegion - 对焦区域 * SensorLocation - 当前摄像头的位置（CameraSensorLocation 枚举：Back 或 Front） * SensorRotationInDegrees - 获取照相机传感器相对于屏幕的旋转度数 */ /* * KnownCameraPhotoProperties 属性集包括 * FlashMode - 闪光灯模式：FlashState.On, FlashState.Auto, FlashState.Off * FlashPower - 闪光亮度，无单位且不同设备上的值不同 * FocusIlluminationMode - 闪光灯的对焦方式：FocusIlluminationMode.Auto, FocusIlluminationMode.Off, FocusIlluminationMode.On * ExposureCompensation - 曝光补偿，单位：1/6 EV * ExposureTime - 曝光时间，单位：微秒 * ManualWhiteBalance - 手动设置白平衡 * WhiteBalancePreset - 设置预置白平衡（WhiteBalancePreset 枚举，包括多云、荧光灯等等） * LockedAutoFocusParameters - 自动对焦、自动曝光或自动白平衡参数（AutoFocusParameters 枚举，有 flag 标记） * AutoFocusParameters.None - 对焦、曝光和白平衡全自动 * AutoFocusParameters.Focus - 暂停自动对焦 * AutoFocusParameters.Exposure - 暂停自动曝光 * AutoFocusParameters.WhiteBalance - 暂停自动白平衡 * Iso - 感光度 * SceneMode - 场景模式（CameraSceneMode 枚举，包括人像优化、夜景优化等等） */ _captureDevice.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashState.On); /* * KnownCameraGeneralProperties 属性集包括 * AutoFocusRange - 自动对焦的范围（AutoFocusRange 枚举，包括微距等） * EncodeWithOrientation - 照片捕获完成后编码时的旋转角度，必须是 90 的倍数 * SpecifiedCaptureOrientation - 照片捕获完成后照片元数据中的旋转角度，必须是 90 的倍数 * IsShutterSoundEnabledByUser - 用户是否启用了快门声音，只读 * IsShutterSoundRequiredForRegion - 运行应用程序的区域是否需要快门声音（有些区域为了保护隐私，要求照相或录像必须要有快门声音），只读 * PlayShutterSoundOnCapture - 指定捕获时是否播放快门声音 * ManualFocusPosition - 手动对焦的位置 */ _captureDevice.SetProperty(KnownCameraGeneralProperties.AutoFocusRange, AutoFocusRange.Normal); _captureDevice.SetProperty(KnownCameraGeneralProperties.EncodeWithOrientation, _captureDevice.SensorRotationInDegrees); // 获取指定属性的值 // _captureDevice.GetProperty(KnownCameraGeneralProperties.IsShutterSoundEnabledByUser); /* * 获取指定的范围类属性在当前相机中所允许的值的范围 */ // PhotoCaptureDevice.GetSupportedPropertyRange(CameraSensorLocation.Back, KnownCameraPhotoProperties.ExposureCompensation); /* * 获取指定的值类属性在当前相机中所允许的值的列表 */ // PhotoCaptureDevice.GetSupportedPropertyValues(CameraSensorLocation.Back, KnownCameraPhotoProperties.FlashMode); // 实时显示捕获的内容 videoBrush.SetSource(_captureDevice); // 扩展方法来自：Microsoft.Devices.CameraVideoBrushExtensions rt.Angle = _captureDevice.SensorRotationInDegrees; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } else { MessageBox.Show("没有后置摄像头"); } } // 照相 private async void btnCapture_Click(object sender, RoutedEventArgs e) { // 创建捕获序列，目前系统仅支持单帧捕获 CameraCaptureSequence seq = _captureDevice.CreateCaptureSequence(1); // 设置序列中的指定帧的 KnownCameraPhotoProperties 属性和 KnownCameraGeneralProperties 属性 // seq.Frames[0].DesiredProperties[KnownCameraPhotoProperties.FlashMode] = FlashState.On; // seq.Frames[0].DesiredProperties[KnownCameraGeneralProperties.AutoFocusRange] = AutoFocusRange.Infinity; // 捕获到的图片的内存流 MemoryStream captureStream = new MemoryStream(); // 捕获到的图片的预览图的内存流 MemoryStream captureStreamPreview = new MemoryStream(); // 设置捕获到的图片的内存流 seq.Frames[0].CaptureStream = captureStream.AsOutputStream(); // 设置捕获到的图片的预览图的内存流 seq.Frames[0].ThumbnailStream = captureStreamPreview.AsOutputStream(); try { // 根据捕获序列的设置，准备好捕获前的相关数据 await _captureDevice.PrepareCaptureSequenceAsync(seq); // 开始捕获 await seq.StartCaptureAsync(); captureStream.Position = 0; captureStreamPreview.Position = 0; // 保存捕获到的图片到“本机照片” MediaLibrary library = new MediaLibrary(); Picture picture = library.SavePictureToCameraRoll("xxx.jpg", captureStream); // 如果有重名，会自动重命名 // 显示捕获到的图片的预览图（也可以通过 picture.GetThumbnail() 来获取预览图） imgPreview.Source = PictureDecoder.DecodeJpeg(captureStreamPreview); lblMsg.Text += "拍照完成，且已保存到照片中心"; lblMsg.Text += System.Environment.NewLine; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } captureStream.SetLength(0); captureStreamPreview.SetLength(0); captureStream.Dispose(); captureStreamPreview.Dispose(); } // 自动对焦 private async void btnFocus_Click(object sender, RoutedEventArgs e) { // 启动自动对焦、自动曝光和自动白平衡，参考 LockedAutoFocusParameters CameraFocusStatus status = await _captureDevice.FocusAsync(); lblMsg.Text += status.ToString(); lblMsg.Text += System.Environment.NewLine; // 复位对焦 // _captureDevice.ResetFocusAsync(); } private void Summary() { lblMsg.Text = ""; // 获取电话上的可用相机 foreach (CameraSensorLocation csl in PhotoCaptureDevice.AvailableSensorLocations) { // Back 或 Front lblMsg.Text += "摄像头：" + csl.ToString(); lblMsg.Text += System.Environment.NewLine; // 捕获所支持的分辨率 lblMsg.Text += "捕获照片的可用分辨率："; foreach (var size in PhotoCaptureDevice.GetAvailableCaptureResolutions(csl)) { lblMsg.Text += size.Width + "*" + size.Height + " "; } lblMsg.Text += System.Environment.NewLine; // 捕获后的预览图所支持的分辨率 lblMsg.Text += "捕获照片的预览图的可用分辨率："; foreach (var size in PhotoCaptureDevice.GetAvailablePreviewResolutions(csl)) { lblMsg.Text += size.Width + "*" + size.Height + " "; } lblMsg.Text += System.Environment.NewLine; lblMsg.Text += "是否支持自动对焦：" + PhotoCaptureDevice.IsFocusSupported(csl); lblMsg.Text += System.Environment.NewLine; lblMsg.Text += "是否支持以编程方式自动对焦：" + PhotoCaptureDevice.IsFocusRegionSupported(csl); lblMsg.Text += System.Environment.NewLine; lblMsg.Text += System.Environment.NewLine; // 关于 CameraButtons 参见以前的文章：http://www.cnblogs.com/webabcd/archive/2012/08/15/2639428.html // CameraButtons.ShutterKeyHalfPressed 事件，CameraButtons.ShutterKeyPressed 事件，CameraButtons.ShutterKeyReleased 事件 } } } }
OK
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