Question

I am trying to make a voice recognition thing with google’s voice api.

I modified UPLOADFILEEX function that can be found on codeproject…

The file I wish to delete is C:\record.flac

Here is the function below

         Public Shared Function UploadFile(ByVal uploadfilename As String, ByVal url As String, ByVal fileFormName As String, ByVal contenttype As String, ByVal querystring As System.Collections.Specialized.NameValueCollection, ByVal cookies As CookieContainer) As String
    If (fileFormName Is Nothing) OrElse (fileFormName.Length = 0) Then
        fileFormName = "file"
    End If
    If (contenttype Is Nothing) OrElse (contenttype.Length = 0) Then
        contenttype = "application/octet-stream"
    End If
    Dim postdata As String
    postdata = "?"
    If Not (querystring Is Nothing) Then
        For Each key As String In querystring.Keys
            postdata += key + "=" + querystring.Get(key) + "&"
        Next
    End If
    Dim uri As Uri = New Uri(url + postdata)
    Dim boundary As String = "----------" + DateTime.Now.Ticks.ToString("x")
    Dim webrequest As HttpWebRequest = CType(Net.WebRequest.Create(uri), HttpWebRequest)
    webrequest.CookieContainer = cookies
    webrequest.ContentType = "audio/x-flac; rate=16000"
    webrequest.Method = "POST"
    Dim sb As StringBuilder = New StringBuilder
    sb.Append("--")
    sb.Append(boundary)
    sb.Append("" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "")
    sb.Append("Content-Disposition: form-data; name=""")
    sb.Append(fileFormName)
    sb.Append("""; filename=""")
    sb.Append(IO.Path.GetFileName(uploadfilename))
    sb.Append("""")
    sb.Append("" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "")
    sb.Append("Content-Type: ")
    sb.Append(contenttype)
    sb.Append("" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "")
    sb.Append("" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "")
    Dim postHeader As String = sb.ToString
    Dim postHeaderBytes As Byte() = Encoding.UTF8.GetBytes(postHeader)
    Dim boundaryBytes As Byte() = Encoding.ASCII.GetBytes("" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "--" + boundary + "" & Microsoft.VisualBasic.Chr(13) & "" & Microsoft.VisualBasic.Chr(10) & "")
    Dim fileStreama As FileStream = New FileStream(uploadfilename, FileMode.Open, FileAccess.Read)
    Dim length As Long = postHeaderBytes.Length + fileStreama.Length + boundaryBytes.Length
    webrequest.ContentLength = length
    Dim requestStream As Stream = webrequest.GetRequestStream
    requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length)
    Dim sendBuffer(Math.Min(4096, fileStreama.Length)) As Byte
    Dim bytesRead As Integer = 0
    Do
        bytesRead = fileStreama.Read(sendBuffer, 0, sendBuffer.Length)
        If bytesRead = 0 Then Exit Do
        requestStream.Write(sendBuffer, 0, bytesRead)
    Loop
    requestStream.Write(boundaryBytes, 0, boundaryBytes.Length)
    Dim responce As WebResponse = webrequest.GetResponse
    Dim s As Stream = responce.GetResponseStream
    Dim sr As StreamReader = New StreamReader(s)
    Return sr.ReadToEnd
    sr.Dispose()
    s.Dispose()
    fileStreama.Dispose()
    requestStream.Dispose()
    webrequest.Abort()
    responce.Close()

End Function

The function WORKS (Thankgod) but whenever I want to clear up (i.e. delete the audio file that is located in the c:) it just hangs and nothing happens…

Below is my code that executes on the formclosing event….

      Private Sub Form1_Close(sender As System.Object, e As System.EventArgs) Handles MyBase.FormClosing
    Dim di As New IO.DirectoryInfo("c:\")
    Dim diar1 As IO.FileInfo() = di.GetFiles()
    Dim dra As IO.FileInfo
    For Each dra In diar1
        If dra.Name.Contains("record.") Then
            dra.Delete()
        End If
    Next
End Sub

As you probably may be able to see from the function I HAVE TRIED TO REMOVE ALL THE STREAMS AND CLOSE THEM SO THE FILE IS NOT BEING ACCESSED

BUT it still hangs and when I try manually delete it… it tells me it is being used by another process (which is my program) – (I use ffmpeg to convert the .wav to .flac file but that does not cause any problems)….

What am I doing wrong…

Have I missed the closing of some stream or something.

By the way the uploadfilename string is c:\record.flac (just for your information – I dont think it will help)

Answer 1

Your function is calling Return BEFORE disposing of the file stream. This means that your Dispose call is never fired.. and the stream holds onto a file reference.