Docusign download file from template which get illegal characters in file base64string format using Chilkat and rest api - vb.net

Question

I can get file from template which passing templateid and documentid, when retrun from api , i will get as base64string format, and when i try to convert as byte,
I get an error "Additional information: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters."
Here the code which i used to download file from template
Dim rest As New Chilkat.Rest
Dim success As Boolean
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
success = rest.Connect("demo.docusign.net", port, bTls, bAutoReconnect)
If (success <> True) Then
Debug.WriteLine("ConnectFailReason: " & rest.ConnectFailReason)
Debug.WriteLine(rest.LastErrorText)
Exit Sub
End If
rest.AddHeader("X-DocuSign-Authentication", "{ ""Username"": ""DocuSign#example.com"", ""Password"":""DocuSign_password"", ""IntegratorKey"":""DocuSign_Integrator_Key"" }")
Dim sbResponseBody As New Chilkat.StringBuilder
success = rest.FullRequestNoBodySb("GET", "/restapi/v2.1/accounts/xxxx/templates/xxxx-xxxx-xxxx-xxxx-xxxx/documents/x", sbResponseBody)
If (success <> True) Then
Debug.WriteLine(rest.LastErrorText)
Exit Sub
End If
Dim respStatusCode As Integer = rest.ResponseStatusCode
If (respStatusCode >= 400) Then
Debug.WriteLine("Response Status Code = " & respStatusCode)
Debug.WriteLine("Response Header:")
Debug.WriteLine(rest.ResponseHeader)
Debug.WriteLine("Response Body:")
Debug.WriteLine(sbResponseBody.GetAsString())
Exit Sub
End If
Dim jsonResponse As New Chilkat.JsonObject
jsonResponse.LoadSb(sbResponseBody)
Dim pdfBytes As Byte() = Convert.FromBase64String(sbResponseBody.ToString)
Regards,
Aravind

Answer 1

i changed my code from chilkat dll to Docusing dll 3.0.0 , using docusing dll i can download file from envelope, here i past my code , it will useful to some other developer.I am used .net framework code download file from file stream.
Private Function DoWnload(ByVal accessToken As String, ByVal basePath As String, ByVal accountId As String, ByVal envelopeId As String, ByVal documents As List(Of EnvelopeDocItem), ByVal docSelect As String) As String
Dim config = New Configuration(New ApiClient(basePath))
config.AddDefaultHeader("Authorization", "Bearer " & accessToken)
Dim envelopesApi As EnvelopesApi = New EnvelopesApi(config)
Dim results As System.IO.Stream = envelopesApi.GetDocument(accountId, envelopeId, docSelect)
Dim docItem As EnvelopeDocItem = documents.FirstOrDefault(Function(d) docSelect.Equals(d.DocumentId))
Dim docName As String = docItem.Name
Dim hasPDFsuffix As Boolean = docName.ToUpper().EndsWith(".PDF")
Dim pdfFile As Boolean = hasPDFsuffix
Dim docType As String = docItem.Type
If ("content".Equals(docType) OrElse "summary".Equals(docType)) AndAlso Not hasPDFsuffix Then
docName += ".pdf"
pdfFile = True
End If
If "zip".Equals(docType) Then
docName += ".zip"
End If
Dim mimetype As String
If pdfFile Then
mimetype = "application/pdf"
ElseIf "zip".Equals(docType) Then
mimetype = "application/zip"
Else
mimetype = "application/octet-stream"
End If
Dim bytesRead As Integer
Dim buffer(4096) As Byte
Using outFile As New System.IO.FileStream("C:\File.pdf", IO.FileMode.Create, IO.FileAccess.Write)
Do
bytesRead = results.Read(buffer, 0, buffer.Length)
If bytesRead > 0 Then
outFile.Write(buffer, 0, bytesRead)
End If
Loop While bytesRead > 0
End Using
Return ""
End Function
Dim envelopeDocItems As List(Of EnvelopeDocItem) = New List(Of EnvelopeDocItem) From {
New EnvelopeDocItem With {
.Name = "Combined",
.Type = "content",
.DocumentId = "combined"
},
New EnvelopeDocItem With {
.Name = "Zip archive",
.Type = "zip",
.DocumentId = "archive"
}
Thanks to Inbar Gazit...
Thanks and Regards,
Aravind

Answer 2

Here is an example: https://www.example-code.com/vbnet/docusign_download_envelope_document.asp
Also see the other VB.NET DocuSign examples: https://www.example-code.com/vbnet/docusign.asp