如何将图像从图像控件保存到文件夹 Win 8 应用程序

Question

我有一个图像控件

       <Image Name="img" HorizontalAlignment="Left"  Height="400" Margin="499,155,0,0" VerticalAlignment="Top" Width="400"/>

我从相机拍摄照片

        private async void TakePhoto_Click(object sender, RoutedEventArgs e)
    {

        CameraCaptureUI camera = new CameraCaptureUI();
        camera.PhotoSettings.CroppedAspectRatio = new Size(4, 3);

        var photo = await camera.CaptureFileAsync(CameraCaptureUIMode.Photo);

        if (photo != null)
        {
            BitmapImage image = new BitmapImage();
            image.SetSource(await photo.OpenAsync(FileAccessMode.Read));
            img.Source = image;
        }
    }

现在我想将此图像从 img 控件保存到文件夹，但我不知道如何将图像从 img 控件解码到 StorageFile

        private async void SaveFile_Click(object sender, RoutedEventArgs e)
    {
        FileSavePicker savePicker = new FileSavePicker();
        savePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        savePicker.FileTypeChoices.Add("jpeg image", new List<string>() { ".jpeg" });
        savePicker.SuggestedFileName = "New picture";

        StorageFile ff = await savePicker.PickSaveFileAsync();
        if (ff != null)
        {
            await photo.MoveAndReplaceAsync(ff);
        }
    }

这是一个保存方法，我想从 Image 控件中保存图像

Answer 1

var photo = await camera.CaptureFileAsync(CameraCaptureUIMode.Photo); 返回一个 StorageFile。您所要做的就是将其保存到您想要的位置。

您可以通过多种方式完成此操作。

例子：

StorageFolder localFolder = ApplicationData.Current.LocalFolder; // the app's local storage folder


await photo.MoveAsync(localFolder); //move the file to a new location

2.

//Create a new copy in a new location

await photo.CopyAsync(localFolder);

注意var photo == StorageFile photo。这意味着在拍摄照片后，它的副本已经保存到本地存储的临时位置（应用程序的 TempState 目录）。