B4X

Download Google Contact Photo

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Demonstrates how to download Google Contact's photo. 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 get the photo, send the following:

'  	GET /m8/feeds/photos/media/default/contactId

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

Dim sbPath As ChilkatStringBuilder
sbPath.Initialize
'  Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
Dim contactId As String = "1ea2e4fe0ef24e09"
sbPath.SetString("/m8/feeds/photos/media/default/{contactId}")
Dim numReplacements As Int = sbPath.Replace("{contactId}", contactId)

Dim imageData As ChilkatBinData
imageData.Initialize
success = rest.FullRequestNoBodyBd("GET", sbPath.GetAsString, imageData)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


'  A 404 response indicates the contact has no photo.
'  (We could've first fetched the contact information, parsed out the 
'  photo etag, and then if no photo etag existed, we'd know the contact has no
'  photo.  Or... we can just try to download the photo and if a 404 is received,
'  we know there's no photo.  Much simpler.)
If rest.ResponseStatusCode = 404 Then
    Log("This contact has no photo.")
    Return
End If


'  A successful response will have a status code equal to 200.
If rest.ResponseStatusCode <> 200 Then
    '  If the response was not successful, then the response body
    '  does not contain image data.  Instead it contains XML.
    Dim sbResponseBody As ChilkatStringBuilder
    sbResponseBody.Initialize
    sbResponseBody.AppendBd(imageData, "utf-8", 0, 0)

    Log("response status code = " & rest.ResponseStatusCode)
    Log("response status text = " & rest.ResponseStatusText)
    Log("response header: " & rest.ResponseHeader)
    Log("response body: " & sbResponseBody.GetAsString)
    Log("request startline: " & rest.LastRequestStartLine)
    Log("request header: " & rest.LastRequestHeader)
    Return
End If


'  Examine the content-type in the response header so we know what file
'  extension to use (.jpg, .png, etc.)
Dim sbContentType As ChilkatStringBuilder
sbContentType.Initialize
sbContentType.Append(rest.ResponseHdrByName("Content-Type"))

If sbContentType.ContentsEqual("image/jpeg", False) = True Then
    imageData.WriteFile("qa_output/contact_photo.jpg")
End If

If sbContentType.ContentsEqual("image/png", False) = True Then
    imageData.WriteFile("qa_output/contact_photo.png")
End If


Log("Content-Type: " & sbContentType.GetAsString)
Log("Success.")