B4X

Google Contacts - Delete a Contact

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Demonstrates how to delete a Google Contact. B4X

Dim success As Boolean = False

'  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 ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
If success <> True Then
    Log("Failed to load googleContacts.json")
    Return
End If


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

Dim rest As ChilkatRest
rest.Initialize("rest")

'  Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = rest.Connect("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 ChilkatStringBuilder
sbPath.Initialize
sbPath.Append("/m8/feeds/contacts/default/full/{contactId}")
'  Get the contact having contactId = "5b6d64980b1ed462"
Dim numReplacements As Int = sbPath.Replace("{contactId}", "5b6d64980b1ed462")

Dim sbResponseBody As ChilkatStringBuilder
sbResponseBody.Initialize
success = rest.FullRequestNoBodySb("GET", sbPath.GetAsString, sbResponseBody)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


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


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

Log(xml.GetXml)
Log("-------------------")

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

'  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 = rest.FullRequestNoBodySb("DELETE", sbPath.GetAsString, sbResponseBody)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


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


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