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[英]how to save image downloaded from url(server) to local folder in windows store app
[英]how to copy image from filepiker to app folder windows store apps
这是文件选择器的代码
我需要将用户打开的图像复制到应用程序文件夹中。 任何人都可以帮助我
private async void Button_Click(object sender, RoutedEventArgs e)
{
if (Windows.UI.ViewManagement.ApplicationView.Value != Windows.UI.ViewManagement.ApplicationViewState.Snapped ||
Windows.UI.ViewManagement.ApplicationView.TryUnsnap() == true)
{
Windows.Storage.Pickers.FileOpenPicker openPicker = new Windows.Storage.Pickers.FileOpenPicker();
openPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
openPicker.ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail;
// Filter to include a sample subset of file types.
openPicker.FileTypeFilter.Clear();
openPicker.FileTypeFilter.Add(".bmp");
openPicker.FileTypeFilter.Add(".png");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".jpg");
//打开文件选择器。
Windows.Storage.StorageFile file = await openPicker.PickSingleFileAsync();
// file is null if user cancels the file picker.
if (file != null)
{
// Open a stream for the selected file.
Windows.Storage.Streams.IRandomAccessStream fileStream =
await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
//将图像源设置为选定的位图。
Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapImage =
new Windows.UI.Xaml.Media.Imaging.BitmapImage();
bitmapImage.SetSource(fileStream);
img.Source = bitmapImage;
this.DataContext = file;
}
}
}
谢谢
使用StorageFile.CopyAsync ,即file.CopyAsync。 第一个参数是目标StorageFolder,例如Windows.Storage.ApplicationData.Current.LocalFolder(如果要复制到appdata); 否则,您需要创建一个文件夹或从选择器中单独获取一个。
例如,您可以让用户使用文件选择器(为文件夹配置)选择默认文件夹。 只需确保将StorageFolder保存在[Windows.Storage.AccessCache][2]
以保留编程访问权限以备将来使用。
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