(VB.NET UWP/WinRT) Google Contacts - Delete a Contact

Demonstrates how to delete a Google Contact.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

' --------------------------------------------------------------------------------------------------------
' Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
' Once connected, the REST object may be re-used for many REST API calls.
' (It's a good idea to put the connection setup code in a separate function/subroutine.)
' --------------------------------------------------------------------------------------------------------

' It is assumed we previously obtained an OAuth2 access token.
' This example loads the JSON access token file 
' saved by this example: Get Google Contacts OAuth2 Access Token

Dim jsonToken As New Chilkat.JsonObject
Dim success As Boolean = jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
If (success <> True) Then
    Debug.WriteLine("Failed to load googleContacts.json")
    Exit Sub
End If


Dim gAuth As New Chilkat.AuthGoogle
gAuth.AccessToken = jsonToken.StringOf("access_token")

Dim rest As New Chilkat.Rest

' Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = Await rest.ConnectAsync("www.google.com",443,True,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth)

' ----------------------------------------------
' OK, the REST connection setup is completed..
' ----------------------------------------------

' To update a contact, we'll first get the contact information
' to get the etag.

' To retrieve the contact, send the following:
' 	GET /m8/feeds/contacts/default/full/{contactId}
' 	GData-Version: 3.0

rest.AddHeader("GData-Version","3.0")

Dim sbPath As New Chilkat.StringBuilder
sbPath.Append("/m8/feeds/contacts/default/full/{contactId}")
' Get the contact having contactId = "5b6d64980b1ed462"
Dim numReplacements As Integer = sbPath.Replace("{contactId}","5b6d64980b1ed462")

Dim sbResponseBody As New Chilkat.StringBuilder
success = Await rest.FullRequestNoBodySbAsync("GET",sbPath.GetAsString(),sbResponseBody)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' A successful response will have a status code equal to 200.
If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response body: " & sbResponseBody.GetAsString())
    Exit Sub
End If


' If the 200 response was received, then the contacts XML is contained
' in the response body.
Dim xml As New Chilkat.Xml
xml.LoadSb(sbResponseBody,False)

Debug.WriteLine(xml.GetXml())
Debug.WriteLine("-------------------")

' Get the etag:
Dim lastKnownEtag As String = xml.GetAttrValue("gd:etag")
Debug.WriteLine("lastKnownEtag = " & lastKnownEtag)
Debug.WriteLine("-------------------")

' To delete, send the following:

' 	DELETE /m8/feeds/contacts/default/full/{contactId}
' 	If-Match: {lastKnownEtag}
' 	GData-Version: 3.0

rest.ClearAllHeaders()
rest.AddHeader("If-Match",lastKnownEtag)
rest.AddHeader("GData-Version","3.0")

' The sbPath already contains the correct path..
success = Await rest.FullRequestNoBodySbAsync("DELETE",sbPath.GetAsString(),sbResponseBody)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' A successful response will have a status code equal to 200.
If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response body: " & sbResponseBody.GetAsString())
    Debug.WriteLine("request header: " & rest.LastRequestHeader)
    Exit Sub
End If


' The response body for a successful DELETE is empty.
Debug.WriteLine("Response Body: (should be empty)")
Debug.WriteLine(sbResponseBody.GetAsString())
Debug.WriteLine("Success.")