Visual Basic 6.0

Send a Staged REST Request with a Streamed Body

Demonstrates Rest.SendReqStreamBody, which sends a request whose body is read from a Stream, then reads the response in separate steps.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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Visual Basic 6.0

Dim success As Long
success = 0

Dim rest As New ChilkatRest
Dim bTls As Long
bTls = 1
Dim bAutoReconnect As Long
bAutoReconnect = 1
success = rest.Connect("example.com",443,bTls,bAutoReconnect)
If (success = 0) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

'  The file paths are relative to the application's current working directory.  Absolute paths
'  may also be used.  Supply the paths appropriate to your own environment.

'  The request body is read from a Stream whose source is a local file.
Dim bodyStream As New ChilkatStream
bodyStream.SourceFile = "qa_data/upload.json"

success = rest.AddHeader("Content-Type","application/json")

'  Send the request, reading the body from the stream.  The 3rd argument is the Stream.
success = rest.SendReqStreamBody("POST","/api/upload",bodyStream)
If (success = 0) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

'  After sending, read the response status line and header fields.  The return value is the HTTP
'  status code, or -1 if no response was received.
Dim statusCode As Long
statusCode = rest.ReadResponseHeader()
If (statusCode < 0) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

Debug.Print "Response status code: " & statusCode

'  Read the response body as text.
Dim responseBody As String
responseBody = rest.ReadRespBodyString()
If (rest.LastMethodSuccess = 0) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

Debug.Print responseBody