与众不同 windows phone (21) - Device(设备)之摄像头(拍摄照片, 录制视频)

介绍与众不同windows phone 7.5 (sdk 7.1) 之设备∙用摄像头拍摄照片∙用摄像头录制视频示例1、演示如何使用摄像头拍摄照片ImageDemo.xaml<phone:PhoneApplicationPagex:Class="Demo.Device.Camera.ImageDemo"xmlns="/winfx/2006/xaml/presentation"xmlns:x="/winfx/2006/xaml"xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Ph one"xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone "xmlns:d="/expression/blend/2008"xmlns:mc="/markup-compatibility/2006"FontFamily="{StaticResource PhoneFontFamilyNormal}"FontSize="{StaticResource PhoneFontSizeNormal}"Foreground="{StaticResource PhoneForegroundBrush}"SupportedOrientations="Landscape" Orientation="Landscape"mc:Ignorable="d" d:DesignHeight="480" d:DesignWidth="800"shell:SystemTray.IsVisible="False"><Grid x:Name="LayoutRoot" Background="Transparent"><StackPanel Orientation="Vertical"><StackPanel Orientation="Horizontal"><Canvas Width="320" Height="240"><Canvas.Background><VideoBrush x:Name="videoBrush"/></Canvas.Background></Canvas><!--显示拍摄到的图片--><Image Name="imgCapture" Width="320" Height="240" Margin="200 0 0"/><!--显示拍摄到的图片的缩略图--><Image Name="imgCaptureThumbnail" Width="32" Height="24"Margin="20 0 0 0"/></StackPanel><StackPanel Orientation="Horizontal"><Button x:Name="btnShutter" Content="快门"Click="btnShutter_Click"/><Button x:Name="btnFlash" Content="闪光灯"Click="btnFlash_Click"/><Button x:Name="btnResolution" Content="分辨率"Click="btnResolution_Click"/></StackPanel><TextBlock Name="lblMsg"/></StackPanel></Grid></phone:PhoneApplicationPage>ImageDemo.xaml.cs/** 演示如何使用摄像头拍摄照片** PhotoCamera - 用于提供相机功能* CameraType - 摄像头的类型（Microsoft.Devices.CameraType 枚举）* Primary - 主摄像头* FrontFacing - 前置摄像头* AvailableResolutions - 获取摄像头的可用分辨率集合（返回一个IEnumerable<Size> 类型的对象）* FlashMode - 相机的闪光灯模式（Microsoft.Devices.FlashMode 枚举）* On - 启用闪光灯* Off - 禁用闪光灯* Auto - 自动闪光灯* RedEyeReduction - 消除红眼闪光灯* Resolution - 相机的分辨率* Orientation - 取景器与相机传感器对齐所需要顺时针旋转的度数（只读）** CaptureImage() - 拍摄相机当前捕获到的照片* IsFlashModeSupported(FlashMode mode) - 相机是否支持指定的闪光灯模式** Initialized - 相机初始化时触发的事件（事件参数为CameraOperationCompletedEventArgs 类型）* CaptureStarted - 相机开始捕获图片时触发的事件* CaptureCompleted - 相机捕获图片完成时触发的事件（事件参数为CameraOperationCompletedEventArgs 类型）* CaptureImageAvailable - 获得了捕获到的图片时触发的事件（事件参数为ContentReadyEventArgs 类型）* CaptureThumbnailAvailable - 获得了捕获到的图片的缩略图时触发的事件（事件参数为 ContentReadyEventArgs 类型）*** CameraOperationCompletedEventArgs* Succeeded - 操作是否成功* Exception - 异常信息*** ContentReadyEventArgs* ImageStream - 获取到的图像流*** 注：如果要求只使用前置摄像头的话，则在 manifest 中添加 <CapabilityName="ID_HW_FRONTCAMERA"/>*/using System;using System.Collections.Generic;using System.Linq;using ;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using Microsoft.Phone.Controls;using Microsoft.Devices;using System.IO;using System.IO.IsolatedStorage;using Microsoft.Xna.Framework.Media;using System.Windows.Navigation;using System.Windows.Media.Imaging;namespace Demo.Device.Camera{public partial class ImageDemo : PhoneApplicationPage{private PhotoCamera _camera;// 当前使用的摄像头分辨率在摄像头支持的分辨率集合中的索引private int _currentResolutionIndex = 0;public ImageDemo(){InitializeComponent();}protected override void OnNavigatedTo(NavigationEventArgs e) {// 设备是否支持主摄像头if (PhotoCamera.IsCameraTypeSupported(CameraType.Primary)) {// 获取主摄像头，并注册相关事件_camera = new PhotoCamera(CameraType.Primary);_camera.Initialized += _camera_Initialized;_camera.CaptureStarted += _camera_CaptureStarted;_camera.CaptureCompleted += _camera_CaptureCompleted; _camera.CaptureImageAvailable +=_camera_CaptureImageAvailable;_camera.CaptureThumbnailAvailable +=_camera_CaptureThumbnailAvailable;// 在 VideoBrush 上显示摄像头捕获到的实时信息videoBrush.SetSource(_camera);lblMsg.Text = "设备的主摄像头正在工作";}else{lblMsg.Text = "此设备没有主摄像头";btnShutter.IsEnabled = false;btnFlash.IsEnabled = false;btnResolution.IsEnabled = false;}}protected override void OnNavigatingFrom(NavigatingCancelEventArgs e){// 释放相关资源if (_camera != null){_camera.Dispose();_camera.Initialized -= _camera_Initialized;_camera.CaptureStarted -= _camera_CaptureStarted;_camera.CaptureCompleted -= _camera_CaptureCompleted;_camera.CaptureImageAvailable -=_camera_CaptureImageAvailable;_camera.CaptureThumbnailAvailable -=_camera_CaptureThumbnailAvailable;}}void _camera_Initialized(object sender, CameraOperationCompletedEventArgs e){if (e.Succeeded){this.Dispatcher.BeginInvoke(delegate(){// 初始化闪光灯模式_camera.FlashMode = FlashMode.Off;btnFlash.Content = "闪光灯：Off";// 初始化分辨率设置_camera.Resolution =_camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex);btnResolution.Content = "分辨率：" +_camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex);lblMsg.Text = "主摄像头初始化成功";});}}void _camera_CaptureStarted(object sender, EventArgs e){// 开始捕获this.Dispatcher.BeginInvoke(delegate(){lblMsg.Text = "图片开始捕获";});}void _camera_CaptureCompleted(object sender, CameraOperationCompletedEventArgs e){// 拍照完成this.Dispatcher.BeginInvoke(delegate(){lblMsg.Text = "图片捕获完成";});}void _camera_CaptureImageAvailable(object sender, ContentReadyEventArgs e){// 获得了所拍摄的图片this.Dispatcher.BeginInvoke(delegate(){var bitmapImage = new BitmapImage();bitmapImage.SetSource(e.ImageStream);imgCapture.Source = bitmapImage;});}public void _camera_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e){// 获得了所拍摄的图片的缩略图this.Dispatcher.BeginInvoke(delegate(){var bitmapImage = new BitmapImage();bitmapImage.SetSource(e.ImageStream);imgCaptureThumbnail.Source = bitmapImage;});}private void btnShutter_Click(object sender, RoutedEventArgs e) {if (_camera != null){try{// 拍摄摄像头当前捕获的图片_camera.CaptureImage();}catch (Exception ex){lblMsg.Text = "拍摄失败：" + ex.Message;}}}// 摄像头分辨率的轮换private void btnResolution_Click(object sender, RoutedEventArgs e) {if (++_currentResolutionIndex >=_camera.AvailableResolutions.Count())_currentResolutionIndex = 0;_camera.Resolution =_camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex);btnResolution.Content = "分辨率：" +_camera.AvailableResolutions.ElementAt<Size>(_currentResolutionIndex);}// 闪光灯模式的轮换private void btnFlash_Click(object sender, RoutedEventArgs e){switch (_camera.FlashMode){case FlashMode.Off:if (_camera.IsFlashModeSupported(FlashMode.On)){_camera.FlashMode = FlashMode.On;btnFlash.Content = "闪光灯：On";}break;case FlashMode.On:if(_camera.IsFlashModeSupported(FlashMode.RedEyeReduction)){_camera.FlashMode = FlashMode.RedEyeReduction;btnFlash.Content = "闪光灯：RedEyeReduction";}else if (_camera.IsFlashModeSupported(FlashMode.Auto)) {_camera.FlashMode = FlashMode.Auto;btnFlash.Content = "闪光灯：Auto";}else{_camera.FlashMode = FlashMode.Off;btnFlash.Content = "闪光灯：Off";}break;case FlashMode.RedEyeReduction:if (_camera.IsFlashModeSupported(FlashMode.Auto)) {_camera.FlashMode = FlashMode.Auto;btnFlash.Content = "闪光灯：Auto";}else{_camera.FlashMode = FlashMode.Off;btnFlash.Content = "闪光灯：Off";}break;case FlashMode.Auto:if (_camera.IsFlashModeSupported(FlashMode.Off)) {_camera.FlashMode = FlashMode.Off;btnFlash.Content = "闪光灯：Off";}break;}}}}2、演示如何使用摄像头录制视频VideoDemo.xaml<phone:PhoneApplicationPagex:Class="Demo.Device.Camera.VideoDemo"xmlns="/winfx/2006/xaml/presentation"xmlns:x="/winfx/2006/xaml"xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Ph one"xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone "xmlns:d="/expression/blend/2008"xmlns:mc="/markup-compatibility/2006"FontFamily="{StaticResource PhoneFontFamilyNormal}"FontSize="{StaticResource PhoneFontSizeNormal}"Foreground="{StaticResource PhoneForegroundBrush}"SupportedOrientations="Landscape" Orientation="Landscape"mc:Ignorable="d" d:DesignHeight="480" d:DesignWidth="800"shell:SystemTray.IsVisible="False"><Grid x:Name="LayoutRoot" Background="Transparent"><StackPanel Orientation="Vertical"><StackPanel Orientation="Horizontal"><!--用于实时显示摄像头捕获到的信息--><Canvas Width="320" Height="240"><Canvas.Background><VideoBrush x:Name="videoBrush"/></Canvas.Background></Canvas><!--用于播放视频--><MediaElement x:Name="mediaElement" Width="320" Height="240" /></StackPanel><StackPanel Orientation="Horizontal"><Button x:Name="btnStartRecord" Content="开始录制"Click="btnStartRecord_Click"/><Button x:Name="btnStopRecord" Content="停止录制"Click="btnStopRecord_Click"/><Button x:Name="btnStartPlayback" Content="开始播放"Click="btnStartPlayback_Click"/><Button x:Name="btnPausePlayback" Content="暂停播放"Click="btnPausePlayback_Click"/></StackPanel><TextBlock Name="lblMsg"/></StackPanel></Grid></phone:PhoneApplicationPage>VideoDemo.xaml.cs/** 演示如何通过摄像头录制视频并保存到独立存储，以及如何播放独立存储中的视频** CaptureSource - 操作相关捕获设备的类* VideoCaptureDevice - 关联的视频捕获设备（System.Windows.Media.VideoCaptureDevice 类型）* AudioCaptureDevice - 关联的音频捕获设备（System.Windows.Media.AudioCaptureDevice 类型）* State - 捕获的相关状态（System.Windows.Media.CaptureState 枚举）* Stopped, Started, Failed* Start() - 启动关联的视频捕获设备和音频捕获设备* Stop() - 关闭关联的视频捕获设备和音频捕获设备* CaptureImageAsync() - 异步捕获图像* CaptureImageCompleted - 异步捕获图像完成后所触发的事件* CaptureFailed - 捕获失败时所触发的事件*** FileSink - 用于将捕获到的视频保存到独立存储的类* CaptureSource - 关联的 CaptureSource 对象* IsolatedStorageFileName - 需要保存到的独立存储的地址*** CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice() - 获取默认的视频捕获设备，返回一个 VideoCaptureDevice 对象* CaptureDeviceConfiguration.GetAvailableVideoCaptureDevices() - 获取可用的视频捕获设备集合，返回一个 VideoCaptureDevice 对象集合* CaptureDeviceConfiguration.GetDefaultAudioCaptureDevice() - 获取默认的音频捕获设备，返回一个 AudioCaptureDevice 对象* CaptureDeviceConfiguration.GetAvailableAudioCaptureDevices() - 获取可用的音频捕获设备集合，返回一个 AudioCaptureDevice 对象集合*** VideoCaptureDevice - 用于描述视频捕获设备的类* DesiredFormat - 期望的视频格式* SupportedFormats - 支持的视频格式* FriendlyName - 设备的名称* IsDefaultDevice - 是否是视频捕获的默认设备*** AudioCaptureDevice - 用于描述音频捕获设备的类* AudioFrameSize - 音频的帧大小（缓冲大小），10 毫秒 - 2000 毫秒之间，默认值是1000 毫秒* DesiredFormat - 期望的音频格式* SupportedFormats - 支持的音频格式* FriendlyName - 设备的名称* IsDefaultDevice - 是否是音频捕获的默认设备*/using System;using System.Collections.Generic;using System.Linq;using ;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using Microsoft.Phone.Controls;using System.Windows.Navigation;using System.IO.IsolatedStorage;using System.IO;namespace Demo.Device.Camera{public partial class VideoDemo : PhoneApplicationPage{private CaptureSource _captureSource;private FileSink _fileSink;// 保存到独立存储的视频的地址private string _isoVideoFileName = "myVideo.mp4";// 需要播放的独立存储中的视频文件的视频流private IsolatedStorageFileStream _isoVideoFile;public VideoDemo(){InitializeComponent();}protected override void OnNavigatedTo(NavigationEventArgs e){base.OnNavigatedTo(e);if (_captureSource == null){_captureSource = new CaptureSource();_captureSource.CaptureFailed +=_captureSource_CaptureFailed;_fileSink = new FileSink();VideoCaptureDevice videoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();if (videoCaptureDevice == null){lblMsg.Text = "该设备不支持视频捕获";}else{// 让 VideoBrush 显示视频捕获的实时信息videoBrush.SetSource(_captureSource);// 调用了 CaptureSource.Start() 之后才会开始捕获视频_captureSource.Start();lblMsg.Text = "设备正在捕获视频中。