VB.NET

HTTP Download to Stream

See more REST Examples

Demonstrates how to stream the response body directly to a stream, which in this case is to a file stream. VB.NET

Dim success As Boolean = False

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rest As New Chilkat.Rest

' The URL we want to download is: 
' https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip
Dim url As New Chilkat.Url
url.ParseUrl("https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip")

' Connect to the web server
Dim bAutoReconnect As Boolean = True
success = rest.Connect(url.Host,url.Port,url.Ssl,bAutoReconnect)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


success = rest.SendReqNoBody("GET",url.Path)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Read the response header.
Dim responseStatusCode As Integer = rest.ReadResponseHeader()
If (responseStatusCode < 0) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Response status code = " & responseStatusCode)

' We expect a 200 response status if the file data is coming.
' Otherwise, we'll get a string response body with an error message(or no response body).
If (responseStatusCode = 200) Then

    Dim bodyStream As New Chilkat.Stream

    ' The stream's sink will be a file.
    bodyStream.SinkFile = "qa_output/OAuth2-CSharp-Desktop/archive/master.zip"

    ' Read the response body to the stream.  Given that we've
    ' set the stream's sink to a file, it will stream directly
    ' to the file.
    success = rest.ReadRespBodyStream(bodyStream,True)
    If (success <> True) Then
        Debug.WriteLine(rest.LastErrorText)
        Exit Sub
    End If


    Debug.WriteLine("Successfully downloaded the file.")

Else
    Dim errResponse As String = rest.ReadRespBodyString()
    If (rest.LastMethodSuccess <> True) Then
        Debug.WriteLine(rest.LastErrorText)
    Else
        Debug.WriteLine(errResponse)
    End If

End If