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Forum Discussion
Error reading file async
I had a problem to download a file ( an Image ) and someone recommended to me to do asynchronously.
I changed my code so :
Async Function _take_file(ByVal _file As String) As Task
....
Dim client As HttpClient = New HttpClient()
Dim _Request As HttpRequestMessage = New HttpRequestMessage(HttpMethod.Post, "https://content.dropboxapi.com/2/files/download")
_Request.Headers.Add("Authorization", "Bearer " + _token)
_Request.Headers.Add("Dropbox-API-Arg", _parametro)
Dim _response As HttpResponseMessage = Await client.SendAsync(_Request)
Dim _responseStream As Stream = Await _response.Content.ReadAsStreamAsync()
Dim myStreamReader As New StreamReader(_responseStream)
I have an error on the last line :
System.NullReferenceException was unhandled
Message: An unhandled exception of type 'System.NullReferenceException' occurred in mscorlib.dll
Hm both ?
i thought that it declared and that got value.
In first case a define the object and i create as a new httpclient
in the second i declare ad object as a new streamreader using data from response .
In the code of example i see i thought it works so 🙂
Your error message means that in your code you have used something not initialized at that time. That's it.
- Greg-DB
Dropbox Staff
I see you're getting a System.NullReferenceException. As Здравко said, that's not an error from the Dropbox API itself. You can find Microsoft's documentation for that exception here though.
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