无法显示拍摄的照片

Question

我正在尝试构建一个相机应用程序。我可以拍照并保存。

但这是一个转折点。如果我将照片保存在 ApplicationData.Current.LocalFolder 中，我可以在 Image 控件中显示它。但是当我将它保存在 KnownFolders.CameraRoll 中时，Image 控件不会加载照片。

照片显示在 phone 的画廊（照片）中，所以并不是文件未创建。我也添加了图片库功能。连个例外都没有！

    async private void Capture_Photo_Click(object sender, RoutedEventArgs e)
    {
        //Create JPEG image Encoding format for storing image in JPEG type
        ImageEncodingProperties imgFormat = ImageEncodingProperties.CreateJpeg();

        //create storage file in local app storage
        //StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("Photo.jpg",CreationCollisionOption.ReplaceExisting);

        //// create storage file in Picture Library
        StorageFile file = await KnownFolders.CameraRoll.CreateFileAsync("Photo.jpg", CreationCollisionOption.GenerateUniqueName);


        // take photo and store it on file location.
        await captureManager.CapturePhotoToStorageFileAsync(imgFormat, file);

        // Get photo as a BitmapImage using storage file path.
        BitmapImage img = new BitmapImage();

        BitmapImage bmpImage = new BitmapImage(new Uri(file.Path));

        // show captured image on Image UIElement.
        imagePreivew.Source = bmpImage;
    }

Answer 1

访问文件PicturLibrary时不同。我们需要通过调用 StorageFile.OpenAsync(FileAccessMode).

来加载具有所需访问模式的文件流

将您的代码更改为您工作的以下内容：

async private void Capture_Photo_Click(object sender, RoutedEventArgs e)
{
        //Create JPEG image Encoding format for storing image in JPEG type
        ImageEncodingProperties imgFormat = ImageEncodingProperties.CreateJpeg();

        //create storage file in local app storage
        //StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("Photo.jpg",CreationCollisionOption.ReplaceExisting);

        //// create storage file in Picture Library
        StorageFile file = await KnownFolders.CameraRoll.CreateFileAsync("Photo.jpg", CreationCollisionOption.GenerateUniqueName);


        // take photo and store it on file location.
        await captureManager.CapturePhotoToStorageFileAsync(imgFormat, file);

        var picstream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);


        BitmapImage img = new BitmapImage();

        img.SetSource(picstream);

        imagePreivew.Source = img;
}

无法显示拍摄的照片

Cannot display captured photo

windows-phone

windows-phone-8.1