wp7在程序中直接开启摄像头（非选择器）

很久没有做wp7开发了，最近看到微信在程序中打开摄像头进行二维码，扫描忽然性起，遍做了下研究，然后发现原来是用到了using Microsoft.Devices;命名空间下的

PhotoCamera 对象，把它赋值给VideoBrush 就可以了

但是真机测试发现图像和真实图像是颠倒90度的，后来才发现，原来PhotoCamera 会将图像旋转一个角度，我们只要获取到这个角度做下处理就可以了

 double d= photocamera.Orientation;在这里获取到图像顺时针旋转的角度
            video.RelativeTransform =  在这个把他给前台的VideoBrush 就可以了
                new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = d };

做了个小demo，在此分享给大家

下面的是前台xaml页面代码

<phone:PhoneApplicationPage 
    x:Class="MyPocketBook.MainPage"
    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"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">


    <!--LayoutRoot 是包含所有页面内容的根网格-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>


        <!--TitlePanel 包含应用程序的名称和页标题-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="页面名称" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>


        <!--ContentPanel - 在此处放置其他内容-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <Grid.RowDefinitions>
                <RowDefinition Height="516"></RowDefinition>
                <RowDefinition Height="91*"></RowDefinition>
            </Grid.RowDefinitions>
            <Grid x:Name="butlist" Grid.Row="1">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                    <ColumnDefinition Width="*"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Button Name="btnstart" Content="开启闪光灯" Grid.Column="0" Width="200"  Click="btnok_Click"></Button>
                <Button Name="btnstop" Content="关闭闪光灯" Grid.Column="1" Width="200"  Click="btnstop_Click"></Button>
            </Grid>
            <Rectangle Grid.Row="0">
                <Rectangle.Fill>
                    <VideoBrush x:Name="video"></VideoBrush>
                </Rectangle.Fill>
            </Rectangle>
        </Grid>
    </Grid>
 
    <!--演示 ApplicationBar 用法的示例代码-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="按钮 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="按钮 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="菜单项 1"/>
                <shell:ApplicationBarMenuItem Text="菜单项 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->


</phone:PhoneApplicationPage>

这里是后台代码，都加了注释的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
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;


namespace MyPocketBook
{
    public partial class MainPage : PhoneApplicationPage
    {
        PhotoCamera photocamera = new PhotoCamera();
        
        // 构造函数
        public MainPage()
        {
            InitializeComponent();
            //相机初始化事件
            photocamera.Initialized += new EventHandler<CameraOperationCompletedEventArgs>(photocamera_Initialized);
            //拍摄序列完成时发生
            photocamera.CaptureCompleted += new EventHandler<CameraOperationCompletedEventArgs>(photocamera_CaptureCompleted);
            //当有缩略图像可用时发生
            photocamera.CaptureThumbnailAvailable += new EventHandler<ContentReadyEventArgs>(photocamera_CaptureThumbnailAvailable);
            double d= photocamera.Orientation;
            video.RelativeTransform =
                new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = d };


            video.SetSource(photocamera);
        }


        void photocamera_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e)
        {
            throw new NotImplementedException();
        }


        void photocamera_CaptureCompleted(object sender, CameraOperationCompletedEventArgs e)
        {
            throw new NotImplementedException();
        }


        void photocamera_Initialized(object sender, CameraOperationCompletedEventArgs e)
        {
           
        }
        bool i = true;
        private void btnok_Click(object sender, RoutedEventArgs e)
        {
            photocamera.FlashMode = FlashMode.On;
            photocamera.Focus();
        }


        private void btnstop_Click(object sender, RoutedEventArgs e)
        {
            i = false;
            photocamera.FlashMode = FlashMode.Off;
        }
        


  
    }
}

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