Delphi ActiveX

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.

This example is deprecated and no longer valid.

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
json: TChilkatJsonObject;
rest: TChilkatRest;
oauth1: TChilkatOAuth1;
bAutoReconnect: Integer;
jsonResponse: TChilkatJsonObject;
sbNextCursor: TChilkatStringBuilder;
pageNum: Integer;
caseSensitive: Integer;
bContinue: Integer;
resp: WideString;
numIds: Integer;
i: Integer;

begin
success := 0;

// 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..
json := TChilkatJsonObject.Create(Self);
success := json.LoadFile('qa_data/tokens/twitter.json');

rest := TChilkatRest.Create(Self);
oauth1 := TChilkatOAuth1.Create(Self);

oauth1.ConsumerKey := 'TWITTER_CONSUMER_KEY';
oauth1.ConsumerSecret := 'TWITTER_CONSUMER_SECRET';
oauth1.Token := json.StringOf('oauth_token');
oauth1.TokenSecret := json.StringOf('oauth_token_secret');
oauth1.SignatureMethod := 'HMAC-SHA1';
oauth1.GenNonce(16);

rest.SetAuthOAuth1(oauth1.ControlInterface,0);

bAutoReconnect := 1;
success := rest.Connect('api.twitter.com',443,1,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

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

// This Twitter user has about 77.5K followers..
rest.AddQueryParam('screen_name','MarcusMiller959');

jsonResponse := TChilkatJsonObject.Create(Self);
jsonResponse.EmitCompact := 0;

// Get the 1st page of results using a cursor of "-1".
sbNextCursor := TChilkatStringBuilder.Create(Self);
sbNextCursor.SetString('-1');

pageNum := 1;
caseSensitive := 0;
bContinue := 1;
// Get a maximum of 5 pages (of 5000 ids each).
while bContinue = 1 do
  begin

    if (sbNextCursor.ContentsEqual('0',caseSensitive) = 1) then
      begin
        // This will cause the loop to exit..
        bContinue := 0;
      end
    else
      begin
        // Adds or replaces the query param.
        rest.AddQueryParam('cursor',sbNextCursor.GetAsString());

        // Get the next page of follower IDs
        resp := rest.FullRequestNoBody('GET','/1.1/followers/ids.json');
        if (rest.LastMethodSuccess <> 1) then
          begin
            Memo1.Lines.Add(rest.LastErrorText);
            Exit;
          end;

        jsonResponse.Load(resp);

        if (rest.ResponseStatusCode <> 200) then
          begin
            Memo1.Lines.Add(jsonResponse.Emit());
            Exit;
          end;

        // Show the number of IDs returned in this 
        numIds := jsonResponse.SizeOfArray('ids');
        Memo1.Lines.Add('Page ' + IntToStr(pageNum) + ', Number of Ids: ' + IntToStr(numIds));

        // Show the 1st 10 ids in this page.
        i := 0;
        while i < numIds do
          begin
            jsonResponse.I := i;
            Memo1.Lines.Add('    ' + IntToStr(i) + ': ' + jsonResponse.StringOf('ids[i]'));

            i := i + 1;
            if (i > 10) then
              begin
                // Force the loop to exit.
                i := numIds;
              end;
          end;

        pageNum := pageNum + 1;
        if (pageNum > 5) then
          begin
            bContinue := 0;
          end
        else
          begin
            sbNextCursor.SetString(jsonResponse.StringOf('next_cursor_str'));
          end;
      end;
  end;

// 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;