(Lianja) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat Lianja Extension Download Chilkat Lianja Extension

// 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

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/googleContacts.json")
if (llSuccess <> .T.) then
    ? "Failed to load googleContacts.json"
    release loJsonToken
    return
endif

loGAuth = createobject("CkAuthGoogle")
loGAuth.AccessToken = loJsonToken.StringOf("access_token")

loRest = createobject("CkRest")

// Connect using TLS.
llBAutoReconnect = .T.
llSuccess = loRest.Connect("www.google.com",443,.T.,llBAutoReconnect)

// Provide the authentication credentials (i.e. the access token)
loRest.SetAuthGoogle(loGAuth)

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

// To get the photo, send the following:

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

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

loSbPath = createobject("CkStringBuilder")
// Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
lcContactId = "1ea2e4fe0ef24e09"
loSbPath.SetString("/m8/feeds/photos/media/default/{contactId}")
lnNumReplacements = loSbPath.Replace("{contactId}",lcContactId)

loImageData = createobject("CkBinData")
llSuccess = loRest.FullRequestNoBodyBd("GET",loSbPath.GetAsString(),loImageData)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loJsonToken
    release loGAuth
    release loRest
    release loSbPath
    release loImageData
    return
endif

// 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 (loRest.ResponseStatusCode = 404) then
    ? "This contact has no photo."
    release loJsonToken
    release loGAuth
    release loRest
    release loSbPath
    release loImageData
    return
endif

// A successful response will have a status code equal to 200.
if (loRest.ResponseStatusCode <> 200) then
    // If the response was not successful, then the response body
    // does not contain image data.  Instead it contains XML.
    loSbResponseBody = createobject("CkStringBuilder")
    loSbResponseBody.AppendBd(loImageData,"utf-8",0,0)

    ? "response status code = " + str(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body: " + loSbResponseBody.GetAsString()
    ? "request startline: " + loRest.LastRequestStartLine
    ? "request header: " + loRest.LastRequestHeader
    release loJsonToken
    release loGAuth
    release loRest
    release loSbPath
    release loImageData
    release loSbResponseBody
    return
endif

// Examine the content-type in the response header so we know what file
// extension to use (.jpg, .png, etc.)
loSbContentType = createobject("CkStringBuilder")
loSbContentType.Append(loRest.ResponseHdrByName("Content-Type"))

if (loSbContentType.ContentsEqual("image/jpeg",.F.) = .T.) then
    loImageData.WriteFile("qa_output/contact_photo.jpg")
endif

if (loSbContentType.ContentsEqual("image/png",.F.) = .T.) then
    loImageData.WriteFile("qa_output/contact_photo.png")
endif

? "Content-Type: " + loSbContentType.GetAsString()
? "Success."


release loJsonToken
release loGAuth
release loRest
release loSbPath
release loImageData
release loSbResponseBody
release loSbContentType