DataFlex

Iterate Pages in Feed

See more Facebook Examples

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vOauth2
    Handle hoOauth2
    Handle hoRest
    String sResponseJson
    Handle hoJson
    Handle hoNextUrl
    String sNextUrlStr
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    // 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
    Get Create (RefClass(cComChilkatOAuth2)) To hoOauth2
    If (Not(IsComObjectCreated(hoOauth2))) Begin
        Send CreateComObject of hoOauth2
    End
    Set ComAccessToken Of hoOauth2 To "FACEBOOK-ACCESS-TOKEN"

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    // Connect to Facebook and send the following GET request:
    Get ComConnect Of hoRest "graph.facebook.com" 443 True True To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Provide the authentication credentials (i.e. the access key)
    Get pvComObject of hoOauth2 to vOauth2
    Get ComSetAuthOAuth2 Of hoRest vOauth2 To iSuccess

    // Gets the 1st page in the user's feed.
    Get ComFullRequestNoBody Of hoRest "GET" "/v2.7/me/feed" To sResponseJson
    Get ComLastMethodSuccess Of hoRest To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Set ComEmitCompact Of hoJson To False
    Get ComLoad Of hoJson sResponseJson To iSuccess

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

    Get Create (RefClass(cComChilkatUrl)) To hoNextUrl
    If (Not(IsComObjectCreated(hoNextUrl))) Begin
        Send CreateComObject of hoNextUrl
    End

    // Get the URL for the next page in the feed.
    Get ComStringOf Of hoJson "paging.next" To sNextUrlStr
    While ((ComLastMethodSuccess(hoJson)) = True)

        Showln "Next page URL: " sNextUrlStr

        Get ComParseUrl Of hoNextUrl sNextUrlStr To iSuccess

        // 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.
        Get ComClearAllQueryParams Of hoRest To iSuccess
        Get ComQuery Of hoNextUrl To sTemp1
        Get ComAddQueryParams Of hoRest sTemp1 To iSuccess

        Get ComFullRequestNoBody Of hoRest "GET" "/v2.7/me/feed" To sResponseJson
        Get ComLastMethodSuccess Of hoRest To bTemp1
        If (bTemp1 <> True) Begin
            Get ComLastErrorText Of hoRest To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComLoad Of hoJson sResponseJson To iSuccess
        // See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.

        // Get the URL for the next page.
        Get ComStringOf Of hoJson "paging.next" To sNextUrlStr
    Loop

    Showln "No more pages in the feed."


End_Procedure