B4X

Set a Multipart Part Body from a StringBuilder

Demonstrates Rest.SetMultipartBodySb, which sets the text body of the selected multipart part from a StringBuilder.

Background. A multipart request is assembled part by part: the part selector chooses the part being built, header fields describe it, and a SetMultipartBody method supplies its content. The request is then sent with a multipart send or full-request method.

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Dim success As Boolean = False

Dim rest As ChilkatRest
rest.Initialize("rest")
Dim bTls As Boolean = True
Dim bAutoReconnect As Boolean = True
success = rest.Connect("example.com", 443, bTls, bAutoReconnect)
If success = False Then
    Log(rest.LastErrorText)
    Return
End If

'  Select the multipart part to build, and set its header fields.
rest.PartSelector = "1"
rest.AddHeader("Content-Disposition", "form-data; name=" & Chr(34) & "field1" & Chr(34))
rest.AddHeader("Content-Type", "application/json")

'  Set the text body of the selected part from a StringBuilder.
Dim sbBody As ChilkatStringBuilder
sbBody.Initialize
sbBody.Append("{ " & Chr(34) & "key" & Chr(34) & ": " & Chr(34) & "value" & Chr(34) & " }")
success = rest.SetMultipartBodySb(sbBody)
If success = False Then
    Log(rest.LastErrorText)
    Return
End If


Dim responseText As String = rest.FullRequestMultipart("POST", "/api/upload")
If rest.LastMethodSuccess = False Then
    Log(rest.LastErrorText)
    Return
End If

Log(responseText)