(Visual Basic 6.0) Google Contacts - Delete a Contact

Demonstrates how to delete a Google Contact.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

' 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 ChilkatJsonObject
Dim success As Long
success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
If (success <> 1) Then
    Debug.Print "Failed to load googleContacts.json"
    Exit Sub
End If

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

Dim rest As New ChilkatRest

' Connect using TLS.
Dim bAutoReconnect As Long
bAutoReconnect = 1
success = rest.Connect("www.google.com",443,1,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
success = 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

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

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

Dim sbResponseBody As New ChilkatStringBuilder
success = rest.FullRequestNoBodySb("GET",sbPath.GetAsString(),sbResponseBody)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' A successful response will have a status code equal to 200.
If (rest.ResponseStatusCode <> 200) Then
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "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 ChilkatXml
success = xml.LoadSb(sbResponseBody,0)

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

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

' To delete, send the following:

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

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

' The sbPath already contains the correct path..
success = rest.FullRequestNoBodySb("DELETE",sbPath.GetAsString(),sbResponseBody)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

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

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