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DataFlex Web API Examples

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(DataFlex) Twitter - Get Follower IDs

Demonstrates how to get a list of follower IDs for a Twitter user. If the number of followers is more than can be returned in a single response, this example will use cursors to page through the followers.

Note: Rate limits will prevent a program from paging through huge lists of followers. In general, a maximum of 16 GET requests (pages) can be retrieved in a short period of time.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJson
    Boolean iSuccess
    Handle hoRest
    Variant vOauth1
    Handle hoOauth1
    Boolean iBAutoReconnect
    Handle hoJsonResponse
    Handle hoSbNextCursor
    Integer iPageNum
    Boolean iCaseSensitive
    Boolean iBContinue
    String sResp
    Integer iNumIds
    Integer i
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    // ----------------------------------------------------------------------
    // This initial setup, which involves setting the OAuth1 properties and connecting
    // to api.twitter.com, is only required once at the beginning.  Once connected, the same
    // object instance may be re-used, and if necessary, it will automatically reconnect
    // as needed.

    // Assume we've previously obtained an access token and saved it to a JSON file..
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComLoadFile Of hoJson "qa_data/tokens/twitter.json" To iSuccess

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End
    Get Create (RefClass(cComChilkatOAuth1)) To hoOauth1
    If (Not(IsComObjectCreated(hoOauth1))) Begin
        Send CreateComObject of hoOauth1
    End

    Set ComConsumerKey Of hoOauth1 To "TWITTER_CONSUMER_KEY"
    Set ComConsumerSecret Of hoOauth1 To "TWITTER_CONSUMER_SECRET"
    Get ComStringOf Of hoJson "oauth_token" To sTemp1
    Set ComToken Of hoOauth1 To sTemp1
    Get ComStringOf Of hoJson "oauth_token_secret" To sTemp1
    Set ComTokenSecret Of hoOauth1 To sTemp1
    Set ComSignatureMethod Of hoOauth1 To "HMAC-SHA1"
    Get ComGenNonce Of hoOauth1 16 To iSuccess

    Get pvComObject of hoOauth1 to vOauth1
    Get ComSetAuthOAuth1 Of hoRest vOauth1 False To iSuccess

    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "api.twitter.com" 443 True iBAutoReconnect To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // This ends the initial setup...
    // ----------------------------------------------------------------------

    // This Twitter user has about 77.5K followers..
    Get ComAddQueryParam Of hoRest "screen_name" "MarcusMiller959" To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonResponse
    If (Not(IsComObjectCreated(hoJsonResponse))) Begin
        Send CreateComObject of hoJsonResponse
    End
    Set ComEmitCompact Of hoJsonResponse To False

    // Get the 1st page of results using a cursor of "-1".
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbNextCursor
    If (Not(IsComObjectCreated(hoSbNextCursor))) Begin
        Send CreateComObject of hoSbNextCursor
    End
    Get ComSetString Of hoSbNextCursor "-1" To iSuccess

    Move 1 To iPageNum
    Move False To iCaseSensitive
    Move True To iBContinue
    // Get a maximum of 5 pages (of 5000 ids each).
    While (iBContinue = True)

        Get ComContentsEqual Of hoSbNextCursor "0" iCaseSensitive To bTemp1
        If (bTemp1 = True) Begin
            // This will cause the loop to exit..
            Move False To iBContinue
        End
        Else Begin
            // Adds or replaces the query param.
            Get ComGetAsString Of hoSbNextCursor To sTemp1
            Get ComAddQueryParam Of hoRest "cursor" sTemp1 To iSuccess

            // Get the next page of follower IDs
            Get ComFullRequestNoBody Of hoRest "GET" "/1.1/followers/ids.json" To sResp
            Get ComLastMethodSuccess Of hoRest To bTemp1
            If (bTemp1 <> True) Begin
                Get ComLastErrorText Of hoRest To sTemp1
                Showln sTemp1
                Procedure_Return
            End

            Get ComLoad Of hoJsonResponse sResp To iSuccess

            Get ComResponseStatusCode Of hoRest To iTemp1
            If (iTemp1 <> 200) Begin
                Get ComEmit Of hoJsonResponse To sTemp1
                Showln sTemp1
                Procedure_Return
            End

            // Show the number of IDs returned in this 
            Get ComSizeOfArray Of hoJsonResponse "ids" To iNumIds
            Showln "Page " iPageNum ", Number of Ids: " iNumIds

            // Show the 1st 10 ids in this page.
            Move 0 To i
            While (i < iNumIds)
                Set ComI Of hoJsonResponse To i
                Get ComStringOf Of hoJsonResponse "ids[i]" To sTemp1
                Showln "    " i ": " sTemp1

                Move i + 1 To i
                If (i > 10) Begin
                    // Force the loop to exit.
                    Move iNumIds To i
                End

            Loop

            Move iPageNum + 1 To iPageNum
            If (iPageNum > 5) Begin
                Move False To iBContinue
            End
            Else Begin
                Get ComStringOf Of hoJsonResponse "next_cursor_str" To sTemp1
                Get ComSetString Of hoSbNextCursor sTemp1 To iSuccess
            End

        End

    Loop

    // A successful JSON response for the 1st page looks like this:

    // 	{
    // 	  "ids": [
    // 	    3140496044,
    // 	    793204773751324672,
    // 	    789951187781050369,
    // 	    763520773587922945,
    // 	    ...
    // 	    15031286,
    // 	    2668251246,
    // 	    3751659443
    // 	  ],
    // 	  "next_cursor": 1531680438812851153,
    // 	  "next_cursor_str": "1531680438812851153",
    // 	  "previous_cursor": 0,
    // 	  "previous_cursor_str": "0"
    // 	}

    // The output of this program looks like this:

    // 	Page 1, Number of Ids: 5000
    // 	    0: 931953350
    // 	    1: 786708055
    // 	    2: 560845700
    // 	    3: 3140496044
    // 	    4: 793204773751324672
    // 	    5: 789951187781050369
    // 	    6: 763520773587922945
    // 	    7: 793143274059988992
    // 	    8: 793139683412762624
    // 	    9: 1588222783
    // 	    10: 703821370778451968
    // 	Page 2, Number of Ids: 5000
    // 	    0: 15031286
    // 	    1: 2668251246
    // 	    2: 3751659443
    // 	    3: 3324584493
    // 	    4: 2440214809
    // 	    5: 1322335441
    // 	    6: 4439178393
    // 	    7: 4911573711
    // 	    8: 720792880080560128
    // 	    9: 720805087124267008
    // 	    10: 172926330
    // 	Page 3, Number of Ids: 5000
    // 	    0: 93867176
    // 	    1: 2992946183
    // 	    2: 2825296077
    // 	    3: 3784572861
    // 	    4: 2150051321
    // 	    5: 2460881603
    // 	    6: 4128849341
    // 	    7: 2234697931
    // 	    8: 2379418164
    // 	    9: 3425171542
    // 	    10: 325759186
    // 	Page 4, Number of Ids: 5000
    // 	    0: 22793412
    // 	    1: 3347750489
    // 	    2: 316923043
    // 	    3: 2481719196
    // 	    4: 3363591905
    // 	    5: 3238116492
    // 	    6: 58467130
    // 	    7: 3015182362
    // 	    8: 2985342719
    // 	    9: 3095965720
    // 	    10: 17505957
    // 	Page 5, Number of Ids: 5000
    // 	    0: 2541434684
    // 	    1: 140022957
    // 	    2: 134845054
    // 	    3: 772810508
    // 	    4: 16979294
    // 	    5: 2320540225
    // 	    6: 105439442
    // 	    7: 2796744529
    // 	    8: 251128801
    // 	    9: 350229758
    // 	    10: 2683994716
    // 


End_Procedure

 

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