最近接触的项目是有关win8 metro 中camera的项目，其中比较重要的类就是 MediaCapture类，现在介绍一下MediaCapture类，也总结一下自己的一些项目体会：
下面是MediaCapture类的一些方法调用：
using System;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Foundation.Metadata;
using Windows.Media;
using Windows.Media.Devices;
using Windows.Media.MediaProperties;
using Windows.Storage;
using Windows.Storage.Streams;
namespace Windows.Media.Capture
{
// Summary:
// Provides functionality for capturing photos, audio, and videos from a capture
// device, such as a webcam.
[Activatable(100794368)]
[DualApiPartition(version = 100794368)]
[MarshalingBehavior(MarshalingType.Standard)]
[Threading(ThreadingModel.MTA)]
[Version(100794368)]
public sealed class MediaCapture : IDisposable
{
// 创建一个MediaCapture对象的实例
public MediaCapture();
//返回一个控制microphone设置的对象，AudioDeviceController对象就是控制microphone设置的对象
public AudioDeviceController AudioDeviceController { get; }
//
//MediaCaptureSettings对象包含MediaCapture的设置，这个函数返回MediaCapture对象的设置
public MediaCaptureSettings MediaCaptureSettings { get; }
//
//返回一个对象，这个对象控制video camera的设置，VideoDeviceController就是这个对象
public VideoDeviceController VideoDeviceController { get; }
// Summary:
// 这是MediaCapture类的 Events，当在media 捕获的时候发生错误时发生这个事件
public event MediaCaptureFailedEventHandler Failed;
//
// Summary:
// 这也是MediaCapture类的Events，当超过记录的限制的时候会触发这个事件
public event RecordLimitationExceededEventHandler RecordLimitationExceeded;
// Summary:
// Adds an audio or video effect.
//
// Parameters:
// mediaStreamType:
// Specifies the streams to which the effect will be applied.
//
// effectActivationID:
// The class identifier of the activatable runtime class that implements the
// effect. The runtime class must implement the IMediaExtension interface.
//
// effectSettings:
// Configuration parameters for the effect.
//
// Returns:
// Returns an IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction AddEffectAsync(MediaStreamType mediaStreamType, string effectActivationID, IPropertySet effectSettings);
//
// Summary:
// Captures a photo to a storage file.
//
// Parameters:
// type:
// The encoding properties for the output image.
//
// file:
// The storage file where the image is saved.
//
// Returns:
// Returns an IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction CapturePhotoToStorageFileAsync(ImageEncodingProperties type, IStorageFile file);
//
// Summary:
// Captures a photo to a random-access stream.
//
// Parameters:
// type:
// The encoding properties for the output image.
//
// stream:
// The stream where the image data is written.
//
// Returns:
// Returns an IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction CapturePhotoToStreamAsync(ImageEncodingProperties type, IRandomAccessStream stream);
//
// Summary:
// Removes all audio and video effects from a stream.
//
// Parameters:
// mediaStreamType:
// The stream from which to remove the effects.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction ClearEffectsAsync(MediaStreamType mediaStreamType);
//
// Summary:
// Performs tasks associated with freeing, releasing, or resetting unmanaged
// resources.
public void Dispose();
//
// Summary:
// Gets the value of an encoding property.
//
// Parameters:
// mediaStreamType:
// Specifies the stream to query for the encoding property.
//
// propertyId:
// The encoding property to retrieve.
//
// Returns:
// Returns the value of the encoding property.
public object GetEncoderProperty(MediaStreamType mediaStreamType, Guid propertyId);
//
// Summary:
// Queries whether the video stream is mirrored horizontally.
//
// Returns:
// True if mirroring is enabled; false otherwise.
public bool GetPreviewMirroring();
//
// Summary:
// Gets the rotation of the video preview stream.
//
// Returns:
// The amount by which the video preview stream is rotated.
public VideoRotation GetPreviewRotation();
//
// Summary:
// Gets the rotation of the recorded video.
//
// Returns:
// The amount by which the recorded video is rotated.
public VideoRotation GetRecordRotation();
//
// Summary:
// Initializes the MediaCapture object, using default settings.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
[Overload("InitializeAsync")]
public IAsyncAction InitializeAsync();
//
// Summary:
// Initializes the MediaCapture object.
//
// Parameters:
// mediaCaptureInitializationSettings:
// The initialization settings.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
[Overload("InitializeWithSettingsAsync")]
public IAsyncAction InitializeAsync(MediaCaptureInitializationSettings mediaCaptureInitializationSettings);
//
// Summary:
// Initializes the low shutter lag photo capture and provides the LowLagPhotoCapture
// object used to manage the recording.
//
// Parameters:
// type:
// The encoding profile used for the image.
//
// Returns:
// When this method completes, a LowLagPhotoCapture object is returned which
// can be used to start the photo capture.
public IAsyncOperation<LowLagPhotoCapture> PrepareLowLagPhotoCaptureAsync(ImageEncodingProperties type);
//
// Summary:
// Initializes the low shutter lag photo sequence capture and provides the LowLagPhotoSequenceCapture
// object used to manage the recording.
//
// Parameters:
// type:
// The encoding profile used for the image.
//
// Returns:
// When this method completes, a LowLagPhotoSequenceCapture object is returned
// which can be used to start the photo sequence capture.
public IAsyncOperation<LowLagPhotoSequenceCapture> PrepareLowLagPhotoSequenceCaptureAsync(ImageEncodingProperties type);
//
// Summary:
// Initializes the low lag recording using the specified custom sink to store
// the recording. This method provides the LowLagMediaRecording object used
// to managed the capture.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customMediaSink:
// The media extension for the custom media sink.
//
// Returns:
// When this method completes, a LowLagMediaRecording object is returned which
// can be used to start the photo capture.
[Overload("PrepareLowLagRecordToCustomSinkAsync")]
public IAsyncOperation<LowLagMediaRecording> PrepareLowLagRecordToCustomSinkAsync(MediaEncodingProfile encodingProfile, IMediaExtension customMediaSink);
//
// Summary:
// Initializes the low lag recording using the specified custom sink to store
// the recording. This method provides the LowLagMediaRecording object used
// to managed the recording.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customSinkActivationId:
// The activatable class ID of the media extension for the custom media sink.
//
// customSinkSettings:
// Contains properties of the media extension.
//
// Returns:
// When this method completes, a LowLagMediaRecording object is returned which
// can be used to start the photo capture.
[Overload("PrepareLowLagRecordToCustomSinkIdAsync")]
public IAsyncOperation<LowLagMediaRecording> PrepareLowLagRecordToCustomSinkAsync(MediaEncodingProfile encodingProfile, string customSinkActivationId, IPropertySet customSinkSettings);
//
// Summary:
// Initializes the low lag recording using the specified file to store the recording.
// This method provides the LowLagMediaRecording object used to managed the
// recording.
//
// Parameters:
// encodingProfile:
// The encoding profile for the recording.
//
// file:
// The storage file where the image is saved.
//
// Returns:
// When this method completes, a LowLagMediaRecording object is returned which
// can be used to start the photo capture.
public IAsyncOperation<LowLagMediaRecording> PrepareLowLagRecordToStorageFileAsync(MediaEncodingProfile encodingProfile, IStorageFile file);
//
// Summary:
// Initializes the low lag recording using the specified random-access stream
// to store the recording. This method provides the LowLagMediaRecording object
// used to managed the recording.
//
// Parameters:
// encodingProfile:
// The encoding profile for the recording.
//
// stream:
// The stream where the image data is written.
//
// Returns:
// When this method completes, a LowLagMediaRecording object is returned which
// can be used to start the photo capture.
public IAsyncOperation<LowLagMediaRecording> PrepareLowLagRecordToStreamAsync(MediaEncodingProfile encodingProfile, IRandomAccessStream stream);
//
// Summary:
// Sets an encoding property.
//
// Parameters:
// mediaStreamType:
// The type of media data the stream represents, such as video or audio.
//
// propertyId:
// The encoding property to set.
//
// propertyValue:
// The new value of the encoding property.
public void SetEncoderProperty(MediaStreamType mediaStreamType, Guid propertyId, object propertyValue);
//
// Summary:
// Asynchronously sets the media encoding properties.
//
// Parameters:
// mediaStreamType:
// The type of media data the stream represents, such as video or audio.
//
// mediaEncodingProperties:
// The properties for the media encoding.
//
// encoderProperties:
// The properties for the encoder.
//
// Returns:
// Object that is used to control the asynchronous operation.
public IAsyncAction SetEncodingPropertiesAsync(MediaStreamType mediaStreamType, IMediaEncodingProperties mediaEncodingProperties, MediaPropertySet encoderProperties);
//
// Summary:
// Enables or disables horizontal mirroring of the video preview stream.
//
// Parameters:
// value:
// True to enable mirroring; false to disable mirroring.
public void SetPreviewMirroring(bool value);
//
// Summary:
// Rotates the video preview stream.
//
// Parameters:
// value:
// The amount by which to rotate the video.
public void SetPreviewRotation(VideoRotation value);
//
// Summary:
// Rotates the recorded video.
//
// Parameters:
// value:
// The amount by which to rotate the video.
public void SetRecordRotation(VideoRotation value);
//
// Summary:
// Starts preview.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction StartPreviewAsync();
//
// Summary:
// Starts sending a preview stream to a custom media sink using the specified
// encoding profile.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customMediaSink:
// The media extension for the custom media sink.
//
// Returns:
// An object that is used to control the asynchronous operation.
[Overload("StartPreviewToCustomSinkAsync")]
public IAsyncAction StartPreviewToCustomSinkAsync(MediaEncodingProfile encodingProfile, IMediaExtension customMediaSink);
//
// Summary:
// Starts sending a preview stream to a custom media sink using the specified
// encoding profile and sink settings.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customSinkActivationId:
// The activatable class ID of the media extension for the custom media sink.
//
// customSinkSettings:
// Contains properties of the media extension.
//
// Returns:
// An object that is used to control the asynchronous operation.
[Overload("StartPreviewToCustomSinkIdAsync")]
public IAsyncAction StartPreviewToCustomSinkAsync(MediaEncodingProfile encodingProfile, string customSinkActivationId, IPropertySet customSinkSettings);
//
// Summary:
// Start recording to a custom media sink using the specified encoding profile.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customMediaSink:
// The media extension for the custom media sink.
//
// Returns:
// An object that is used to control the asynchronous operation.
[Overload("StartRecordToCustomSinkAsync")]
public IAsyncAction StartRecordToCustomSinkAsync(MediaEncodingProfile encodingProfile, IMediaExtension customMediaSink);
//
// Summary:
// Start recording to a custom media sink using the specified encoding profile
// and sink settings.
//
// Parameters:
// encodingProfile:
// The encoding profile to use for the recording.
//
// customSinkActivationId:
// The activatable class ID of the media extension for the custom media sink.
//
// customSinkSettings:
// Contains properties of the media extension.
//
// Returns:
// Anobject that is used to control the asynchronous operation.
[Overload("StartRecordToCustomSinkIdAsync")]
public IAsyncAction StartRecordToCustomSinkAsync(MediaEncodingProfile encodingProfile, string customSinkActivationId, IPropertySet customSinkSettings);
//
// Summary:
// Starts recording asynchronously to a storage file.
//
// Parameters:
// encodingProfile:
// The encoding profile for the recording.
//
// file:
// The storage file where the image is saved.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction StartRecordToStorageFileAsync(MediaEncodingProfile encodingProfile, IStorageFile file);
//
// Summary:
// Starts recording to a random-access stream.
//
// Parameters:
// encodingProfile:
// The encoding profile for the recording.
//
// stream:
// The stream where the image data is written.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction StartRecordToStreamAsync(MediaEncodingProfile encodingProfile, IRandomAccessStream stream);
//
// Summary:
// Stops preview.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction StopPreviewAsync();
//
// Summary:
// Stops recording.
//
// Returns:
// Returns a IAsyncAction object that is used to control the asynchronous operation.
public IAsyncAction StopRecordAsync();
}
}
MediaCapture类主要利用一些捕获装置，例如camera、microphone等，捕获照片、音频、视频等，并提供一些其他功能；
它的命名空间是 using Windows.Media.Capture;
如果要看一些示例运用，建议可以去win8 官网上面看看，或者我上两篇博文的实例里面都有一些涉及，谢谢大家，本期就介绍到这里。