How to get file read permission in Edge browser's native host

Question

I am trying to read the settings file from Edge browser's native host which is implemented in UWP. This settings file has some list of URLs to process it in extension. But I am not able to read the file in the native host. I am getting the following exception while reading the file.

System.UnauthorizedAccessException: 'Access to the path 'C:\Users\abc\Desktop\Settings.dat' is denied.'

string fileName = "C:\\Users\\Sameer\\Desktop\\Settings.dat"; 
bool bfileExist = File.Exists(fileName); 
if (bfileExist) { byte[] fileData = File.ReadAllBytes(fileName); }

does anyone have any idea to read the file in Edge browser's native host? Please let me know.

So, you're developing an UWP app and want to read file from the path 'C:\Users\abc\Desktop\Settings.dat'? — Xie Steven, Oct 10 '19 at 11:41
Yes, I am developing the UWP app and want to read file from particular location. — sam, Oct 10 '19 at 12:43
Have you add [`broadFileSystemAccess`](https://learn.microsoft.com/en-us/windows/uwp/files/file-access-permissions) capability for your uwp app? — Nico Zhu, Oct 10 '19 at 12:51
Yes, I have tried broadFileSystemAccess capability but it is giving the same error. — sam, Oct 10 '19 at 12:57
How do you get file in your uwp app, could you share your code ? — Nico Zhu, Oct 10 '19 at 13:30

score 1 · Accepted Answer · answered Oct 10 '19 at 15:00

UWP has provided broadFileSystemAccess capability to access broader file with APIs in the Windows.Storage namespace. You need add the restricted broadFileSystemAccess capability before access. And please avoid use System.IO api. For more please refer the following code.

var file= await Windows.Storage.StorageFile.GetFileFromPathAsync(fileName);
if (file!= null)
{
    byte[] result;
    using (Stream stream = await file.OpenStreamForReadAsync())
    {
        using (var memoryStream = new MemoryStream())
        {

            stream.CopyTo(memoryStream);
            result = memoryStream.ToArray();
        }
    }

}

sam · Answer 2 · 2019-10-11T07:49:22.433

I have solved this by using following code

string fileName = "C:\\Users\\Sameer\\Desktop\\Settings.dat";
Windows.Storage.StorageFile file = await Windows.Storage.StorageFile.GetFileFromPathAsync(fileName);

if(file != null)
{
  var bufferData = await Windows.Storage.FileIO.ReadBufferAsync(file);               
  Windows.Storage.Streams.DataReader dataReader = Windows.Storage.Streams.DataReader.FromBuffer(bufferData);
  byte[] fileData = new byte[bufferData.Length];
  dataReader.ReadBytes(fileData);
}

How to get file read permission in Edge browser's native host

2 Answers2