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(VB.NET) REST Receive Response in ChunksSee more REST ExamplesDemonstrates how to receive a REST HTTP response in chunks. Note: This example requires Chilkat 10.1.0 or greater.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim rest As New Chilkat.Rest ' Connect to the web server Dim bTls As Boolean = True Dim port As Integer = 443 Dim bAutoReconnect As Boolean = True Dim success As Boolean = rest.Connect("chilkatsoft.com",port,bTls,bAutoReconnect) If (success = False) Then Debug.WriteLine(rest.LastErrorText) Exit Sub End If ' Send the request. ' This can be *any* kind of request: POST, GET, PUT, etc. using *any* of the Chilkat REST methods that send requests. ' For this example, we'll just GET a simple XML document that is about 274K in size. success = rest.SendReqNoBody("GET","/hamlet.xml") If (success = False) Then Debug.WriteLine(rest.LastErrorText) Exit Sub End If ' Get the response header. Dim statusCode As Integer = rest.ReadResponseHeader() If (statusCode < 0) Then Debug.WriteLine(rest.LastErrorText) Exit Sub End If Debug.WriteLine("response status code = " & statusCode) Dim outputFile As String = "c:/temp/qa_output/hamlet.xml" Dim fac As New Chilkat.FileAccess success = fac.OpenForWrite(outputFile) If (statusCode < 0) Then Debug.WriteLine(fac.LastErrorText) Exit Sub End If ' Get the response in chunks. ' (Note: There are more efficient ways to simply download a file from a web server, such as by calling Chilkat's Http.Download method. ' The purpose of this method is to show how to receive a response chunk-by-chunk.) Dim bd As New Chilkat.BinData Dim status As Integer = 1 While status = 1 ' Read a minimum of 16000 bytes. ' Note: Because of TLS message lengths, or the possibility of the response being either compressed (gzip/deflate) or in the HTTP chunked encoding, ' the amount of data received in each call can be greater than the specified min size. ' Chilkat will return from the call as soon as it has received an amount equal to or more than the specified size, ' except for the very last chunk, which can be less that the min size or even 0 bytes. ' The status will be one of three values: ' -1 = error ' 0 = received the last chunk of the response. ' 1 = received a chunk, and more chunks are coming.. ' The received data is *appended* to the contents of the BinData object. status = rest.ReadRespChunkBd(16000,bd) If (status >= 0) Then Debug.WriteLine("Received chunk: " & bd.NumBytes & " bytes") fac.FileWriteBd(bd,0,0) bd.Clear() End If End While fac.FileClose() Debug.WriteLine("Success.") |
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