(PureBasic) Iterate Pages in Feed

Demonstrates how to read the next page in the user's Facebook feed, and iterates through all of the pages in the Facebook feed.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkUrl.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkOAuth2.pb"

Procedure ChilkatExample()

    ; This example requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    ; This example assumes a previously obtained an access token
    oauth2.i = CkOAuth2::ckCreate()
    If oauth2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkOAuth2::setCkAccessToken(oauth2, "FACEBOOK-ACCESS-TOKEN")

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect to Facebook and send the following GET request:
    success.i = CkRest::ckConnect(rest,"graph.facebook.com",443,1,1)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkOAuth2::ckDispose(oauth2)
        CkRest::ckDispose(rest)
        ProcedureReturn
    EndIf

    ; Provide the authentication credentials (i.e. the access key)
    CkRest::ckSetAuthOAuth2(rest,oauth2)

    ; Gets the 1st page in the user's feed.
    responseJson.s = CkRest::ckFullRequestNoBody(rest,"GET","/v2.7/me/feed")
    If CkRest::ckLastMethodSuccess(rest) <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkOAuth2::ckDispose(oauth2)
        CkRest::ckDispose(rest)
        ProcedureReturn
    EndIf

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(json, 0)
    CkJsonObject::ckLoad(json,responseJson)

    ; 
    ; See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.
    ; 

    nextUrl.i = CkUrl::ckCreate()
    If nextUrl.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Get the URL for the next page in the feed.
    nextUrlStr.s = CkJsonObject::ckStringOf(json,"paging.next")
    While CkJsonObject::ckLastMethodSuccess(json) = 1

        Debug "Next page URL: " + nextUrlStr

        CkUrl::ckParseUrl(nextUrl,nextUrlStr)

        ; Prepare for getting the next page in the feed.
        ; We can continue using the same REST object.
        ; If already connected, we'll continue using the existing connection.
        ; Otherwise, a new connection will automatically be made if needed.
        CkRest::ckClearAllQueryParams(rest)
        CkRest::ckAddQueryParams(rest,CkUrl::ckQuery(nextUrl))

        responseJson = CkRest::ckFullRequestNoBody(rest,"GET","/v2.7/me/feed")
        If CkRest::ckLastMethodSuccess(rest) <> 1
            Debug CkRest::ckLastErrorText(rest)
            CkOAuth2::ckDispose(oauth2)
            CkRest::ckDispose(rest)
            CkJsonObject::ckDispose(json)
            CkUrl::ckDispose(nextUrl)
            ProcedureReturn
        EndIf

        CkJsonObject::ckLoad(json,responseJson)
        ; See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.

        ; Get the URL for the next page.
        nextUrlStr = CkJsonObject::ckStringOf(json,"paging.next")
    Wend

    Debug "No more pages in the feed."


    CkOAuth2::ckDispose(oauth2)
    CkRest::ckDispose(rest)
    CkJsonObject::ckDispose(json)
    CkUrl::ckDispose(nextUrl)


    ProcedureReturn
EndProcedure