private async void Open_Click(object sender, RoutedEventArgs e)
{
open.IsChecked = false;
Windows.Storage.Pickers.FileOpenPicker openPicker = new Windows.Storage.Pickers.FileOpenPicker();
openPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".gif");
Windows.Storage.StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
Windows.Storage.Streams.IRandomAccessStream stream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
using (var inputStream = stream.GetInputStreamAt(0))
{
await canvas.InkPresenter.StrokeContainer.LoadAsync(inputStream);
}
stream.Dispose();
alreadySaved = true;
lastFile = file;
}
}
/// <summary>
/// 将文件转换为字节数组
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static async Task <byte[]> AsByteArray(this Windows.Storage.StorageFile file)
{
Windows.Storage.Streams.IRandomAccessStream fileStream =
await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
var reader = new Windows.Storage.Streams.DataReader(fileStream.GetInputStreamAt(0));
await reader.LoadAsync((uint)fileStream.Size);
byte[] pixels = new byte[fileStream.Size];
reader.ReadBytes(pixels);
return(pixels);
}
public static async System.Threading.Tasks.Task <byte[]> ReadBytesFromFileAsync(string fileName)
{
try
{
Windows.Storage.StorageFolder tempFolder = await Windows.Storage.StorageFolder.GetFolderFromPathAsync(Options.options.tempFolderPath);
Windows.Storage.StorageFile file = await tempFolder.GetFileAsyncServiceAsync(text, apiArgs);
// TODO: obsolete to use DataReader? use await Windows.Storage.FileIO.Read...(file);
using (Windows.Storage.Streams.IRandomAccessStream stream = await file.OpenReadAsync())
{
using (Windows.Storage.Streams.DataReader reader = new Windows.Storage.Streams.DataReader(stream.GetInputStreamAt(0)))
{
await reader.LoadAsync((uint)stream.Size);
byte[] bytes = new byte[stream.Size];
reader.ReadBytes(bytes);
return(bytes);
}
}
}
catch (Exception ex)
{
Log.WriteLine(ex.Message);
return(null);
}
}