Async HTTP POST/GET in VB .Net 2005 !!

Async HTTP POST/GET in VB .Net 2005 !!

• DBAMANI

  If all you want to do is download a file asynchronously, please see the System.Net.WebClient class. This class abstracts much of the complexity and is even simpler to use the HttpWebRequest class noted above for such a scenario.
  
  

• PatrickCairns

  This is what I came up with..
  
  
  I was also having the same problem, for my problem I had made this works for me. (I am learning VB 2005, so dont expect too much)
  
  Public Sub PostData(ByVal strURL As String, Optional ByVal POST1 As String = "", Optional ByVal POST2 As String = "")
  Try
  ' Declare a variable named client of type WebClient.
  Dim myWebClient As WebClient
  ' Instantiate a WebClient object and assign it to the 'client' variable.
  myWebClient = New WebClient
  
  ' Add handler to process theWebClient's DownloadProgressChanged events.
  AddHandler myWebClient.UploadProgressChanged, AddressOf DownloadProgress
  
  ' Add handler to process theWebClient's DownloadCompleted event.
  AddHandler myWebClient.UploadStringCompleted, AddressOf DownloadCompleted
  
  ' Declare a variable named downloadUri of type Uri
  Dim downloadUri As Uri
  ' Instantiate a new Uri object and assign it to the 'downloadUri' variable.
  downloadUri = New Uri(strURL)
  
  'myWebClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4")
  'myWebClient.Headers.Add("Accept-Language", "en-us,en;q=0.5")
  
  
  If txtProxy.Text.Length > 0 Then
  Dim proxy As New WebProxy(txtProxy.Text, True)
  myWebClient.Proxy = proxy
  End If
  
  
  '' For Intial Posting Of Data
  If strURI.Length > 0 Then
  myWebClient.UploadStringAsync(downloadUri, "filename=" & POST1 )
  End If
  
  
  
  Catch webex As WebException
  Console.WriteLine(webex.Message)
  End Try
  End Sub
  
  Public Sub DownloadProgress(ByVal sender As Object, ByVal e As UploadProgressChangedEventArgs)
  Debug.Print(e.ProgressPercentage)
  
  End Sub
  
  Public Sub DownloadCompleted(ByVal sender As Object, ByVal e As UploadStringCompletedEventArgs)
  Msgbox "Hurray!"
  End Sub
  
  
  
  

• Salman Maredia

  Thanks all for reply, I guess this will help me http://msdn2.microsoft.com/en-us/library/ms144246.aspx , will post after testing
  
  
  

• CNB

  Check

  http://msdn2.microsoft.com/en-us/library/system.net.httpwebrequest.begingetresponse.aspx.

  It is more efficient to use async IO then threads. Obviuosly threads are still in the picture, but the Begin methods do async IO under the cover and this is optimal.

  
  

• Tomys

  I tried the suggestions but failed to get any result, Pls. post a code sample.
  
  What I wanted to achieve is POST filecode value to the server which will return the file as response to my POST, posted below is the response captured from server.
  
  HTTP/1.1 200 OK
  Date: Thu, 06 Jul 2006 05:27:08 GMT
  Connection: close
  Content-Type: application/octet-stream
  Accept-Ranges: bytes
  Content-Disposition: Attachment; filename=tk.txt
  Content-Length: 1125
  
  FILE CONTENT GOES HERE.................................................. ....................................................................
  
  
  
  

• kshill

  Deepak,

  You dont have to use asynchronous mode for such a feature, use threading you mentioned.

  Create a single component that can download a file, use a couple of threads to download the files.

  
  
  
• Async HTTP POST/GET in VB .Net 2005 !!