Reading a txt file in vb for windows store app

Question

I try developing a windows Store App using VB

I want to read  the content of a text file "TextFile1.txt" which I created in Visual stdio 2013 RC and display the content in textblock "text1"

i tried this code

 

Private Sub Button_Tapped(sender As Object, e As TappedRoutedEventArgs)
        Dim folder As Windows.Storage.StorageFolder
        folder = Windows.ApplicationModel.Package.Current.InstalledLocation
        Dim file As StorageFile
        Dim prg As String
        file = StorageFile.GetFileFromPathAsync("ms-appx:///programs/TextFile1.txt")
        If file IsNot Nothing Then

            prg = FileIO.ReadTextAsync(file)
            text1.Text = prg

        Else
            prg = "empty"
        End If
    End Sub

I get runtime error

1. An exception of type 'System.ArgumentException' occurred in C_Programming.exe but was not handled in user code

Additional information: The parameter is incorrect.

WinRT information: Alternate stream names must begin with "app-".

If there is a handler for this exception, the program may be safely continued.

2. at 

prg = FileIO.ReadTextAsync(file)

Cannot be converted to string. I also tried giving the path name directly replacing the file but I get the same error.

please help me.

Thanx in advance.

Answer 1

Hi,

I have moved this thread to Building Windows Store apps with C# or VB forum for more dedicated support.

Thanks for your understanding.

Regards.

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Answer 2

Two issues:

GetFileFromPathAsync requires a path and since it's Async you need to Await it.

To use a URI like ms-appx use the GetFileFromApplicationUriAsync | getFileFromApplicationUriAsync method :

  file = Await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///programs/TextFile1.txt"))
     

You'll also have to add an "Async" modifier to your function declaration. See Quickstart: Calling asynchronous APIs in  C# or Visual Basic for more information on asynchronous methods.

Private Async Sub Button_Tapped(sender As Object, e As TappedRoutedEventArgs)

--Rob