Question

我在选择图像后出现了一个简单的图片库问题，我将它发送到Windows 10中的另一个屏幕，它工作得很完美但是当我在手机中尝试时，它没有任何理由崩溃，我的代码是以下之一：

XAML代码：

<Page
    x:Class="Stop_Diabetes.Pages.Camera"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Stop_Diabetes.Pages"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="#227EC2" Loaded="Page_Loaded">

    <Page.Resources>
        <local:ImageConverter x:Key="imageConverter"/>
        <DataTemplate x:Key="imageTemplate">
            <Grid Width="190" Height="130">
                <Image Source="{Binding Path=Thumbnail, 
            Converter={StaticResource imageConverter}}" Tapped="Image_Tapped"
            Width="200" Height="200"/>
            </Grid>
        </DataTemplate>
        <CollectionViewSource 
        x:Name="picturesSource"/>
    </Page.Resources>

    <Grid>
        <Grid x:Name="stkGallery" Canvas.ZIndex="15" VerticalAlignment="Bottom">
            <GridView x:Name="gvPictures" VerticalAlignment="Top" Height="150"  ItemsSource="{Binding Source={StaticResource picturesSource}}" ItemTemplate="{StaticResource imageTemplate}"  ScrollViewer.HorizontalScrollMode="Enabled" ScrollViewer.HorizontalScrollBarVisibility="Visible">
                <GridView.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapGrid Orientation="Vertical"></WrapGrid>
                    </ItemsPanelTemplate>
                </GridView.ItemsPanel>
            </GridView>
        </Grid>
    </Grid>
</Page>

C＃重要代码：

private void Page_Loaded(object sender, RoutedEventArgs e)
{
    List<string> fileTypeFilter = new List<string>();
    fileTypeFilter.Add(".jpg");
    fileTypeFilter.Add(".jpeg");
    fileTypeFilter.Add(".png");
    fileTypeFilter.Add(".gif");
    fileTypeFilter.Add(".bmp");
    //Define thr query to iterate thriugh all the subfolders 
    var pictureQueryOptions = new QueryOptions(CommonFileQuery.OrderByDate, fileTypeFilter);
    //Read through all the subfolders. 
    pictureQueryOptions.FolderDepth = FolderDepth.Deep;
    //Apply the query on the PicturesLibrary 
    var pictureQuery = KnownFolders.PicturesLibrary.CreateFileQueryWithOptions(pictureQueryOptions);
    // 
    var picturesInformation = new FileInformationFactory(pictureQuery, ThumbnailMode.PicturesView);
    picturesSource.Source = picturesInformation.GetVirtualizedFilesVector();
}

private async void Image_Tapped(object sender, Windows.UI.Xaml.Input.TappedRoutedEventArgs e)
{
    Image img = (Image)sender;
    FileInformation fi = img.DataContext as FileInformation;
    if (fi != null)
    {
        string path = fi.Name;
        //do something with the path...

        var pStorage = KnownFolders.PicturesLibrary;

        StorageFile file = await pStorage.GetFileAsync(path);

        ImageProperties imgProp = await file.Properties.GetImagePropertiesAsync();

        using (var imgStream = await file.OpenAsync(FileAccessMode.Read))
        {
            WriteableBitmap bitmap = new WriteableBitmap((int)imgProp.Width, (int)imgProp.Height);
            bitmap.SetSource(imgStream);

            Frame.Navigate(typeof(Crop), bitmap);
        }
    }
}

public class ImageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string culture)
    {
        if (value != null)
        {
            var img = (IRandomAccessStream)value;
            var picture = new BitmapImage();
            picture.SetSource(img);
            return picture;
        }
        return DependencyProperty.UnsetValue;
    }
    public object ConvertBack(object value, Type targetType, object parameter, string culture)
    {
        throw new NotImplementedException();
    }
}

我的问题发生在这里：

StorageFile file = await pStorage.GetFileAsync（path）;

在PC中完美打开图像，但是当我在手机中时它说：

消息=“系统找不到指定的文件。\ r \ n”

这很奇怪，因为图片已加载，但以后无法打开，我尝试了不同的选项，如ID，路径等，没有人工作。有谁知道我应该在Windows 10 Mobile中更改什么？

这或多或少看起来应该是当前代码的结果：

Answer 1

fileinfo类有一个openAsync和OpenReadAsync方法，为什么不使用它们呢？

https://msdn.microsoft.com/en-us/library/windows/apps/br207562

https://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.bulkaccess.fileinformation.openreadasync

以下是您应该更改的代码

 using (var imgStream = await fi.OpenReadAsync())

Answer 2

在appxmanifest中启用了“图片库”功能吗？

在Windows 10 Mobile中读取图像时出错

2 个答案: