Problem with Function.

[Kimmy4]

Hi guys,
I am using .NET compact Framework.

Here's function:

Public Function UploadFileBinary(ByVal localFile As String, ByVal uploadUrl As String)
        Try
            ' Define the fact we don't want fully trusted certs
            ServicePointManager.CertificatePolicy = New MyCertificateValidation
            ' We want ssl 3
            'ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3
            ' Create a request
            Dim req As HttpWebRequest = WebRequest.Create(uploadUrl)
 
            ' Create a new CredentialCache object and fill it with the network
            ' credentials required to access the server.
            Dim credentials As NetworkCredential = New NetworkCredential("username", "password")
            Dim credentialCache As System.Net.CredentialCache = New CredentialCache
            credentialCache.Add(New System.Uri(uploadUrl), "Basic", credentials)
 
            req.Method = "PUT"
 
            req.Credentials = credentialCache
            'req.AuthenticationLevel = AuthenticationLevel.None
 
            req.AllowWriteStreamBuffering = True
 
            ' Retrieve request stream 
            Dim reqStream As Stream = req.GetRequestStream()
            ' Open the local file
            Dim rdr As FileStream = New FileStream(localFile, FileMode.Open)
 
            ' Allocate byte buffer to hold file contents
            Dim inData() As Byte = New Byte(4096) {}
 
            ' loop through the local file reading each data block
            '  and writing to the request stream buffer
            Dim bytesRead As Integer = rdr.Read(inData, 0, inData.Length)
            While (bytesRead > 0)
                reqStream.Write(inData, 0, bytesRead)
                bytesRead = rdr.Read(inData, 0, inData.Length)
            End While
 
            rdr.Close()
            reqStream.Close()
 
            'req.AuthenticationLevel = AuthenticationLevel.None
 
            req.GetResponse()
            Return True
        Catch webEx As WebException
            If (webEx.Status = WebExceptionStatus.ProtocolError) Then
                Debug.WriteLine(TAB & "Web Exception caught in Upload.UploadFileBinary() - Authorisation Failed" & NL & TAB & webEx.Message.ToString)
            Else
                Debug.WriteLine(TAB & "Web Exception caught in Upload.UploadFileBinary()." & NL & TAB & webEx.Message.ToString)
            End If
            Return False
        Catch ex As Exception
            Debug.WriteLine(TAB & "Exception caught in Upload.UploadFileBinary()." & NL & TAB & ex.Message.ToString)
            Return False
        End Try
    End Function

The problem i am getting is when i try to upload some files (they are XML files) i can upload 2 but then when it comes to the third it fails to upload it and my whole system stops responding (I'm guessing this may be because it is waiting for the .getresponse() to time-out (but i'm not 100% sure)). I have very little knowledge in this area and have been given this code by a colleague, so i was wondering whether someone can see where my problem is occuring and how i may be able to fix it because as i said, i have very little knowledge in this area and can't seem to find the problem myself.

Thanks in advance for any help


Edit: If it helps anyone...here's the exception that gets caught:
Web Exception caught in Upload.UploadFileBinary().
An error message cannot be displayed because an optional resource assembly containing it cannot be found

[Kimmy4]

I added debug messages after each line in the code and it stops it never displays the debug line after the line of code

req.GetResponse()

but only on the third file. It displays the message for the first two. I tried running the code with only 2 files to upload and they upload perfectly so i tried it with 4 files and it fails on the third again!
I'm doing a couple of more tests so i can let you know of any other results i find, but if anyone thinks they know what my problem may be then i'd be really grateful of any input.
Thanks guys

[stanav]

Try wrapping it around an If block and check to see if there is a response first....

If req.HaveResponse() Then
                req.GetResponse()
            End If

[Kimmy4]

Could you explain to me why i would need to do this as it may help me understand the process of uploading using http even more. I'll try it out and let you know what i get.
Thanks for your help.

[Kimmy4]

Stanav,
I tried what you suggested and it didn't upload anything at all that time!

[Kimmy4]

*bump*

[Kimmy4]

I have added a few more message boxes to try and find out whats happening and when i add a message after the line

Dim bytesRead As Integer = rdr.Read(inData, 0, inData.Length)

to display what bytesRead is initialised to it returns the size of the xml file it is trying to upload and then i added a debug message inside the while loop and only one message displays and this shows bytesRead = 0.
Don't know whether this will help at all but i really need this problem sorted asap so i thought i's supply all the information i know!
It turns out the web request isn't even hitting the server!
Please can anyone help?

[Kimmy4]

*bump*

[Kimmy4]

I am trying to work around my problem by only uploading a certain amount at a time, but if someone could possibly tell me why it always fails on the third upload i would really appreciate it, because i can't think of any reason why it would be failing when it has uploaded 2 files successfully directly before trying the third one???

Can anyone please help
Thanks