"Vadym Stetsyak" wrote:

> Hello, dbix!
>
> You can try to see what happens on the lower layer:
> for .NET 2.0
> ( http://msdn2.microsoft.com/en-us/library(d=robot)/a6sbz1dx.aspx )
> ( http://msdn2.microsoft.com/en-us/library(d=robot)/hyb3xww8.aspx )
>
> for 1.1 use some packet sniffing tool ( e.g Ethereal )
>
> You can ask additionaly on
> microsoft.public.dotnet.framework.compactframework
> --
> Regards, Vadym Stetsyak
> www: http://vadmyst.blogspot

"dbix" wrote:

> I have an application that will be copying pictures (gif & jpg) from a
> virtual directory  on a server onto a mobile device when the user chooses to
> do so.  When the pictures begin copying, I sometimes get an error.  I can not
> recreate the error on my handheld, but it occurs regularly on users handhelds.
>
> With some handhelds, the data was copied without any error.
> For example, I get NO errors with the following:
> Dell Axim x51v running  Windows Mobile 5.0 with Windows XP running IIS 5.1
> iPAQ 3800 running PPC 2002 with Windows XP running IIS 5.1
> iPAQ (not sure on model) running PPC 2003 with Windows Server 2003 running
> IIS 6.0
>
> I get the error with the following (but after successfully copying a few of
> many pictures):
> IPAQ hx2750 (I believe was running 2003) with Windows Server 2003 running
> IIS 6.0
>
> I get the error immediate after it starts downloading with:
> HP IPAQ (I believe was running 2003) with Windows Server 2003 running IIS 6.0
>
> All the above have .NET Framework 1.1.
>
> Note that I have not been able to test this with different types of
> handhelds with different servers.  All of the above items were with different
> handhelds and different servers.
>
> There is a try/catch block around the place where the error is happening,
> but the catch does not seem to be catching it since I am getting an unhandled
> error message. 
>
> Note that we are only using the HTTPWeb Request/Response, we are not doing
> any winsock level code.
>
> I am encountering the following error, which occurs RIGHT after the handheld
> says ‘downloading…’:
>
> ObjectDisposedException
> System.Net.Sockets.Socket
>
> Socket::throwIfDisposed+0x19
> Socket::Poll+0x6
> Connection::sendRequest+0x26
> WorkItem::doWork+0x36
> Timer::ring+0x59
>
>
>
> The following is the section of code where the error is happening:
>
> --------- Copy Pictures (portion of code):
>
>                 'Loop through all students with pictures and download all
> available pictures
>                 PictureCountProcessed = 0
>                 PictureCountAdded = 0
>                 For Each StudentDataRow In
> StudentData.StudentsWithPictures.Rows
>                     Try
>                         If (Not File.Exists(SelectedLocalPictureDirectory +
> StudentDataRow.Item("PictureFile").ToString())) Then
>                             PictureCountProcessed += 1
>                             lblStatus.Text = "Downloading (" +
> PictureCountProcessed.ToString() + ") ... " +
> StudentDataRow.Item("PictureFile").ToString()
>                             Me.Refresh()
>                             If
> (ConnectionData.DownloadFileFromURL(RemotePicturesRootURL +
> StudentDataRow.Item("PictureFile").ToString(), SelectedLocalPictureDirectory
> + StudentDataRow.Item("PictureFile").ToString())) Then
>                                 PictureCountAdded += 1
>                             End If
>                         End If
>
>                     Catch ex As Exception
>                         lblStatus.Text = " Downloading (" +
> PictureCountProcessed.ToString() + ") ... Picture not found on server."
>                         'Unable to download this picture, keep looping.
>                         'Future:  Check for connectivity errors here
>                     End Try
>                     Me.Refresh()
>                 Next
>
>
> --------- DownloadFileFromURL function:
>
>         Public Shared Function DownloadFileFromURL(ByVal RemoteFileURL As
> String, ByVal DownloadToLocalFilePath As String) As Boolean
>             Dim req As HttpWebRequest
>             Dim res As HttpWebResponse
>             Dim ReceiveStream As Stream
>             Dim encode As Encoding
>             Dim readStream As Stream
>             Dim writestream As FileStream
>             Dim read(256) As [Char]
>             Dim count As Integer
>             Dim strErrMsg As String
>             Dim strErrLine As String
>
>             Try
>                 ' Create a 'WebRequest' object with the specified url
>                 strErrLine = "1 - Create a WebRequest object with the
> specified url"
>                 req = CType(WebRequest.Create(RemoteFileURL), HttpWebRequest)
>                 req.Timeout = 60000
>
>                 ' Send the 'WebRequest' and wait for response.
>                 strErrLine = "2 - Send the WebRequest and wait for response."
>                 res = CType(req.GetResponse(), HttpWebResponse)
>                 If res.StatusCode <> HttpStatusCode.OK Then
>                     DownloadFileFromURL = False
>                     strErrMsg = "Connection Problems - " &
> res.StatusDescription
>                     Exit Try
>                 End If
>
>                 ' Call method 'GetResponseStream' to obtain stream
> associated with the response object
>                 strErrLine = "3 - Call method GetResponseStream"
>                 readStream = res.GetResponseStream()
>
>                 strErrLine = "6 - Write to Streamwriter"
>                 writestream = New FileStream(DownloadToLocalFilePath,
> FileMode.Create, FileAccess.Write)
>
>                 ' Read 256 charcters at a time    .
>                 strErrLine = "7 - Read 256 charcters at a time"
>
>                 Dim BUFFER_SIZE As Integer = 1024
>                 Dim Buffer() As Byte
>
>                 Buffer = New [Byte](BUFFER_SIZE) {}
>                 count = readStream.Read(Buffer, 0, BUFFER_SIZE)
>                 While (count > 0)
>                     writestream.Write(Buffer, 0, count)
>                     count = readStream.Read(Buffer, 0, BUFFER_SIZE)
>                 End While
>                 writestream.Close()
>
>                 strErrLine = "8 - Release the resources"
>                 ' Release the resources of stream object.
>                 readStream.Close()
>
>                 DownloadFileFromURL = True
>             Catch weberrt As WebException
>                 req.Abort()
>                 DownloadFileFromURL = False
>                 strErrMsg = "Web - Error in DownloadFileFromURL - " &
> strErrLine & " - " & weberrt.Message
>             Catch except As Exception
>                 DownloadFileFromURL = False
>                 strErrMsg = "Except - Error in DownloadFileFromURL - " &
> strErrLine & " - " & except.Message
>             Finally
>                 ' Release the resources of response object.
>                 If (Not IsNothing(res)) Then
>                     res.Close()
>                     res = Nothing
>                 End If
>             End Try
>
>         End Function
>
>
> This link shows an exact copy of my situation with no resolution.  (I can’t
> find other situations on the web).
> http://www.error-bank.com/microsoft.public.dotnet.framework.compactframework/54498_Thread.aspx
>
> If it can’t be resolved, what work-around can I do to copy pictures from a
> server to a handheld?
>
> --
> www.yellowkayak.org
> Integrity, responsibility, Respect