win8 metro 调用摄像头拍摄照片并将照片保存在对应的位置

刚刚做过这类开发，所以就先献丑了，当然所贴上的源代码都是经过验证过的，已经执行成功了，希望能够给大家一些借鉴：

以下是metro UI代码：

<Pagex:Class="Camera.MainPage"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="using:Camera"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d"><Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"><Button x:Name="btnCamera" Content="打开摄像头" HorizontalAlignment="Left" Margin="48,259,0,0" VerticalAlignment="Top" Click="btnCamera_Click" Height="45"/><Image x:Name="img1" HorizontalAlignment="Left" Height="609" Margin="240,78,0,0" VerticalAlignment="Top" Width="718" Stretch="Fill"/><Button x:Name="btnSave" Content="保存图片" HorizontalAlignment="Left" Margin="48,369,0,0" VerticalAlignment="Top" Height="44" Click="btnSave_Click"/></Grid>
</Page>

显示的界面事实上非常easy，可是这不重要，功能才是基本的，以下贴上基本的开发代码：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.Media.Capture;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.UI.Xaml.Media.Imaging;
using Windows.Storage.Streams;// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238/** * 作者：李天鹏* 功能：调用PC上自带的camera实现拍照的功能，并保存在对应的目录下* */
namespace Camera
{/// <summary>/// An empty page that can be used on its own or navigated to within a Frame./// </summary>public sealed partial class MainPage : Page{private StorageFile file = null;public MainPage(){this.InitializeComponent();}private async void btnCamera_Click(object sender, RoutedEventArgs e){CameraCaptureUI dialog = new CameraCaptureUI();dialog.PhotoSettings.CroppedAspectRatio = new Size(16, 9);file = await dialog.CaptureFileAsync(CameraCaptureUIMode.Photo);if (file != null){BitmapImage bitmapImage = new BitmapImage();using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read)){bitmapImage.SetSource(fileStream);}img1.Source = bitmapImage;}}private async void btnSave_Click(object sender, RoutedEventArgs e){if (img1.Source == null)return;else{FileSavePicker picker = new FileSavePicker();picker.CommitButtonText = "保存";picker.SuggestedFileName = "hello";picker.FileTypeChoices.Add("图片",new string[]{".jpg",".jpeg",".bmp",".png"});picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;StorageFile filePath = await picker.PickSaveFileAsync();if (filePath != null){//打开通过摄像头拍摄的照片，并返回流，以流的形式读取文件var streamRandom = await file.OpenAsync(FileAccessMode.Read);//将拍摄的照片以流的形式读取到缓冲区IBuffer buffer = RandomAccessStreamToBuffer(streamRandom);//将缓冲区内容写入对应的目录中await FileIO.WriteBufferAsync(filePath, buffer);}}}//将图片写入到缓冲区private IBuffer RandomAccessStreamToBuffer(IRandomAccessStream randomstream){Stream stream = WindowsRuntimeStreamExtensions.AsStreamForRead(randomstream.GetInputStreamAt(0));MemoryStream memoryStream = new MemoryStream();if (stream != null){byte[] bytes = ConvertStreamTobyte(stream);  //将流转化为字节型数组if (bytes != null){var binaryWriter = new BinaryWriter(memoryStream);binaryWriter.Write(bytes);}}IBuffer buffer = WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream, 0, (int)memoryStream.Length);return buffer;}//将流转换成二进制public static byte[] ConvertStreamTobyte(Stream input){byte[] buffer = new byte[16 * 1024];using (MemoryStream ms = new MemoryStream()){int read;while ((read = input.Read(buffer, 0, buffer.Length)) > 0){ms.Write(buffer, 0, read);}return ms.ToArray();}}}
}

可是这还不够，假设须要调用camera，还须要一些权限，应该在Package.appxmanifest里面改动权限，