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DataFlex Web API Examples

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(DataFlex) Paging User Photos with Cursor

Demonstrates how to iterate over the pages of user photos using a cursor.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

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

    // 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.
    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

    // Indicate that we only want the photos the user has personally uploaded.
    Get ComAddQueryParam Of hoRest "type" "uploaded" To iSuccess

    // We could limit the number of photos per page using the "limit" field.
    Get ComAddQueryParam Of hoRest "limit" "20" To iSuccess

    // Get the 1st page of photos. (Not the actual image data, but the information about each photo.)
    // See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
    Get ComFullRequestNoBody Of hoRest "GET" "/v2.7/me/photos" 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
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // 
    // See Parsing the Facebook User Photos for code showing how to parse the JSON photos content.
    // 

    // Get the "after" cursor.
    Get ComStringOf Of hoJson "paging.cursors.after" To sAfterCursor
    While ((ComLastMethodSuccess(hoJson)) = True)

        Showln "after cursor: " sAfterCursor

        // Prepare for getting the next page of photos.
        // 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 ComAddQueryParam Of hoRest "type" "uploaded" To iSuccess
        Get ComAddQueryParam Of hoRest "limit" "20" To iSuccess
        Get ComAddQueryParam Of hoRest "after" sAfterCursor To iSuccess

        Get ComFullRequestNoBody Of hoRest "GET" "/v2.7/me/photos" 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 Photos for code showing how to parse the JSON photos content.

        Get ComEmit Of hoJson To sTemp1
        Showln sTemp1

        // Get the cursor for the next page.
        Get ComStringOf Of hoJson "paging.cursors.after" To sAfterCursor
    Loop

    Showln "No more pages of photos."


End_Procedure

 

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