[UWP] Create a FileStream in UWP

Question

I need to read a file from disk and feed a System.IO.Stream to the library (sharpkml) that will process it. I have an issue when executing the code in UWP, in WIN32 is fine.

This code works fine:

Stream ioStream = System.IO.File.Open(relPath, FileMode.Open);
bool check = stream_NET is FileStream // returns always true
file = KmlFile.Load(ioStream);

When deploying to UWP I use the following code but the library throws an exception:

StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile storageFile = await storageFolder.GetFileAsync(filename);
var stream_WINRT = await storageFile.OpenReadAsync();
Stream stream_NET = stream_WINRT.AsStream(); // returns a IO.BufferedStream
bool check = stream_NET is FileStream // returns always false
file = KmlFile.Load(stream_NET); // the library throws an exception

So the question is how do I get a FileStream on UWP? Because from my understanding that’s the issue.

Answer 1

Hi,

APIs in System.IO.File namespace is available in UWP apps. You could refer this link:System.IO namespaces for UWP apps.

So you could still use the System.IO.File.Open() method like this:

  StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
            StorageFile storageFile = await storageFolder.GetFileAsync(filename);
            var stream = System.IO.File.Open(storageFile.Path,FileMode.Open);
            bool check = stream is FileStream;

Best regards,

Roy

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Answer 2

Thanks Roy that obviously works fine!

I thought IO.File wasn't available under UWP and we had to use Windows.Storage methods. It's honestly a bit confusing but my bad for not checking.