Issue with SaveAsync

[ghost]

Hi all,
I have a UWP Desktop application in which I have a page with a CanvasControl. I have the following method:

public async void SaveImage()
{
//CanvasDevice device = CanvasDevice.GetSharedDevice();
CanvasDevice device = Canvas1.Device;

        var picker = new FileSavePicker();
        picker.FileTypeChoices.Add("Jpegs", new List<string>() { ".jpg" });

        var file = await picker.PickSaveFileAsync();
        if (file == null)
            return;

        using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
        {
            var renderTarget = new CanvasRenderTarget(device, (float)Canvas1.ActualWidth, (float)Canvas1.ActualHeight, 96);
            await renderTarget.SaveAsync(file.Path, CanvasBitmapFileFormat.Jpeg);                
        }
    }

which raise an exception when the "SaveAsync" is called:
System.UnauthorizedAccessException: "Zugriff verweigert (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"

Access denied basically.

Any Suggestion?

[shawnhar]

You need to pass the stream directly into SaveAsync, not just the path as a string.

[ghost]

Hi Shawn,
thanks for your prompt Feedback! I'm a bit confused because I see that this methods is expecting in sequence the filename and the file Format:

[shawnhar]

Look at the other overloads of SaveAsync.

[13thsymphony]

In general you can't pass around paths in the user's filesystem (as opposed to special folders like the app package directory) because of the UWP security model:
https://docs.microsoft.com/en-us/windows/uwp/files/file-access-permissions