Visual FoxPro

Download Google Contact Photo

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Demonstrates how to download Google Contact's photo. Visual FoxPro

LOCAL lnSuccess
LOCAL loJsonToken
LOCAL loGAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL loSbPath
LOCAL lcContactId
LOCAL lnNumReplacements
LOCAL loImageData
LOCAL loSbResponseBody
LOCAL loSbContentType

lnSuccess = 0

* 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('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/googleContacts.json")
IF (lnSuccess <> 1) THEN
    ? "Failed to load googleContacts.json"
    RELEASE loJsonToken
    CANCEL
ENDIF

loGAuth = CreateObject('Chilkat.AuthGoogle')
loGAuth.AccessToken = loJsonToken.StringOf("access_token")

loRest = CreateObject('Chilkat.Rest')

* Connect using TLS.
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("www.google.com",443,1,lnBAutoReconnect)

* 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('Chilkat.StringBuilder')
* 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('Chilkat.BinData')
lnSuccess = loRest.FullRequestNoBodyBd("GET",loSbPath.GetAsString(),loImageData)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loSbPath
    RELEASE loImageData
    CANCEL
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
    CANCEL
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('Chilkat.StringBuilder')
    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
    CANCEL
ENDIF

* Examine the content-type in the response header so we know what file
* extension to use (.jpg, .png, etc.)
loSbContentType = CreateObject('Chilkat.StringBuilder')
loSbContentType.Append(loRest.ResponseHdrByName("Content-Type"))

IF (loSbContentType.ContentsEqual("image/jpeg",0) = 1) THEN
    loImageData.WriteFile("qa_output/contact_photo.jpg")
ENDIF

IF (loSbContentType.ContentsEqual("image/png",0) = 1) 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