private async void ReadBytesButton_Click(object sender, RoutedEventArgs e)
{
StorageFile file = rootPage.sampleFile;
if (file != null)
{
try
{
IBuffer buffer = await FileIO.ReadBufferAsync(file);
string fileContent = MainPage.GetStringFromBuffer(buffer);
rootPage.NotifyUser($"The following {buffer.Length} bytes of text were read from '{file.Name}':\n{fileContent}", NotifyType.StatusMessage);
}
catch (FileNotFoundException)
{
rootPage.NotifyUserFileNotExist();
}
catch (Exception ex) when(ex.HResult == MainPage.E_NO_UNICODE_TRANSLATION)
{
rootPage.NotifyUser("File is not UTF-8 encoded.", NotifyType.ErrorMessage);
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
rootPage.NotifyUser($"Error reading from '{file.Name}': {ex.Message}", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUserFileNotExist();
}
}
private async void ReadFromStreamButton_Click(object sender, RoutedEventArgs e)
{
StorageFile file = rootPage.sampleFile;
if (file != null)
{
try
{
using (IRandomAccessStream readStream = await file.OpenAsync(FileAccessMode.Read))
{
UInt64 size64 = readStream.Size;
if (size64 <= UInt32.MaxValue)
{
UInt32 size32 = (UInt32)size64;
IBuffer buffer = new Windows.Storage.Streams.Buffer(size32);
buffer = await readStream.ReadAsync(buffer, size32, InputStreamOptions.None);
string fileContent = MainPage.GetStringFromBuffer(buffer);
rootPage.NotifyUser($"The following text was read from '{file.Name}' using a stream:\n{fileContent}", NotifyType.StatusMessage);
}
else
{
rootPage.NotifyUser($"File {file.Name} is too big for ReadAsync to read in a single chunk. Files larger than 4GB need to be broken into multiple chunks to be read by ReadAsync.", NotifyType.ErrorMessage);
}
}
}
catch (FileNotFoundException)
{
rootPage.NotifyUserFileNotExist();
}
catch (Exception ex) when(ex.HResult == MainPage.E_NO_UNICODE_TRANSLATION)
{
rootPage.NotifyUser("File is not UTF-8 encoded.", NotifyType.ErrorMessage);
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
rootPage.NotifyUser($"Error reading from '{file.Name}': {ex.Message}", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUserFileNotExist();
}
}