How do I read a binary file in a Windows Store app?

.net-4.5, c#, windows-store-apps

Solution

You always access files in Windows Store apps using StorageFile class:

StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(filename);

You can then get the binary contents of the file using the WinRT APIs:

IBuffer buffer = await FileIO.ReadBufferAsync(file);
byte[] bytes = buffer.ToArray();

If you want to use BinaryReader you need a stream instead:

StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync("a");
Stream stream = (await file.OpenReadAsync()).AsStreamForRead();
BinaryReader reader = new BinaryReader(stream);

Make sure you only use ReadBytes() for binary data in this case which doesn't take encoding into account.

Problem

Original source