Windows Phone7在程序中直接开启摄像头(非选择器)
jopen
12年前
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; } } }