CODEWITHSUNDEEP
c#uwp
mig50
mig50

Reputation: 17

File.ReadAllBytes throwing UnauthorizedAccessException: 'Access to the path is denied' UWP

I'm creating a UWP app, and i'm trying to read an image from a file to a Byte[]. I don't know why but i'm always getting the exception from whatever file path... I tried running that same method File.ReadAllBytes from a different project and it didn't throw the exception. Is it a problem of permissions in my project?

Foto = File.ReadAllBytes(@"C:\users\migue\Desktop\aladin.jpg");

<Package
  ...
  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
  IgnorableNamespaces="uap mp uap5 rescap">
...
<Capabilities>
    <rescap:Capability Name="broadFileSystemAccess" />
</Capabilities>

I tried using this example code in my appmanifest, but it doesn't work. The code is in microsoft docs page.

Upvotes: 0

Views: 591

Answers (1)

Anran Zhang
Anran Zhang

Reputation: 7727

Rather than accessing files directly by path, it is recommended to use FileOpenPicker to open the file in UWP.

You can use this code:

public async static Task<StorageFile> OpenLocalFile(params string[] types)
{
    var picker = new FileOpenPicker();
    picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
    Regex typeReg = new Regex(@"^\.[a-zA-Z0-9]+$");
    foreach (var type in types)
    {
        if (type == "*" || typeReg.IsMatch(type))
            picker.FileTypeFilter.Add(type);
        else
            throw new InvalidCastException("File extension is incorrect");
    }
    var file = await picker.PickSingleFileAsync();
    if (file != null)
        return file;
    else
        return null;
}

Usage

var file = await OpenLocalFile(".jpg");
var bytes = (await FileIO.ReadBufferAsync(file)).ToArray();

Best regards.

Upvotes: 1

Related Questions