(Delphi DLL) Facebook User Feed (Read Posts)

Demonstrates how to read the feed of posts (including status updates) and links published by this person, or by others on this person's profile. This introductory example gets the first few posts.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, OAuth2, Rest, DtObj, JsonObject, CkDateTime;

...

procedure TForm1.Button1Click(Sender: TObject);
var
oauth2: HCkOAuth2;
rest: HCkRest;
success: Boolean;
responseJson: PWideChar;
json: HCkJsonObject;
dtime: HCkDateTime;
bLocalTime: Boolean;
dt: HCkDtObj;
i: Integer;
numItems: Integer;
message: PWideChar;
story: PWideChar;
prevUrl: PWideChar;
nextUrl: PWideChar;

begin
// 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 := CkOAuth2_Create();
CkOAuth2_putAccessToken(oauth2,'FACEBOOK-ACCESS-TOKEN');

rest := CkRest_Create();

// Connect to Facebook and send the following GET request:
success := CkRest_Connect(rest,'graph.facebook.com',443,True,True);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// Provide the authentication credentials (i.e. the access key)
CkRest_SetAuthOAuth2(rest,oauth2);

// We could limit the number of posts.  The default limit is 25.
CkRest_AddQueryParam(rest,'limit','5');

responseJson := CkRest__fullRequestNoBody(rest,'GET','/v2.7/me/feed');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_Load(json,responseJson);

// Show the JSON in human-readable format.
Memo1.Lines.Add(CkJsonObject__emit(json));

// A sample JSON response is shown below.  
// This is the code to parse the JSON response.

dtime := CkDateTime_Create();
bLocalTime := True;

i := 0;
numItems := CkJsonObject_SizeOfArray(json,'data');
while i < numItems do
  begin
    CkJsonObject_putI(json,i);
    Memo1.Lines.Add('--- ' + IntToStr(i));
    message := CkJsonObject__stringOf(json,'data[i].message');
    if (CkJsonObject_getLastMethodSuccess(json) = True) then
      begin
        Memo1.Lines.Add('message: ' + message);
      end;
    story := CkJsonObject__stringOf(json,'data[i].story');
    if (CkJsonObject_getLastMethodSuccess(json) = True) then
      begin
        Memo1.Lines.Add('story: ' + story);
      end;
    Memo1.Lines.Add('id: ' + CkJsonObject__stringOf(json,'data[i].id'));

    // We can load the created_time into a CkDateTime...
    CkDateTime_SetFromTimestamp(dtime,CkJsonObject__stringOf(json,'data[i].created_time'));
    dt := CkDateTime_GetDtObj(dtime,bLocalTime);
    Memo1.Lines.Add(IntToStr(CkDtObj_getMonth(dt)) + '/' + IntToStr(CkDtObj_getDay(dt)) + '/' + IntToStr(CkDtObj_getYear(dt)) + '  '
         + IntToStr(CkDtObj_getHour(dt)) + ':' + IntToStr(CkDtObj_getMinute(dt)));
    CkDtObj_Dispose(dt);
    i := i + 1;
  end;

// Finally, there are two paging URLs at the very bottom.  Those can be accessed as shown:
prevUrl := CkJsonObject__stringOf(json,'paging.previous');
Memo1.Lines.Add('URL for previous page: ' + prevUrl);

nextUrl := CkJsonObject__stringOf(json,'paging.next');
Memo1.Lines.Add('URL for next page: ' + nextUrl);

// -------------------------------------------------------------------
// This is a sample JSON response..
// { 
//   "data": [
//     { 
//       "message": "This is the first post.",
//       "created_time": "2016-09-28T14:36:45+0000",
//       "id": "12345678901234567_12345678900000001"
//     },
//     { 
//       "message": "This is the 2nd post.",
//       "created_time": "2016-09-27T03:26:12+0000",
//       "id": "12345678901234567_12345678900000002"
//     },
//     { 
//       "story": "John Doe shared Mary's post.",
//       "created_time": "2016-09-26T15:45:10+0000",
//       "id": "12345678901234567_12345678900000003"
//     },
//     { 
//       "message": "https:\/\/www.somewebsite.org\/?ID=8158",
//       "created_time": "2016-09-26T02:29:20+0000",
//       "id": "12345678901234567_12345678900000004"
//     },
//     { 
//       "message": "http:\/\/blog.somebody.com\/post\/123",
//       "created_time": "2016-09-26T02:02:56+0000",
//       "id": "12345678901234567_12345678900000005"
//     },
//     { 
//       "story": "John Doe shared Bill's photo.",
//       "created_time": "2016-09-25T15:32:09+0000",
//       "id": "12345678901234567_12345678900000006"
//     },
//     { 
//       "message": "Check this out...",
//       "story": "John Doe shared NPR Music's video.",
//       "created_time": "2016-09-25T14:54:52+0000",
//       "id": "12345678901234567_12345678900000007"
//     },
//     { 
//       "message": "Yet another post...",
//       "created_time": "2016-09-24T17:21:30+0000",
//       "id": "12345678901234567_12345678900000008"
//     },
//     { 
//       "message": "http:\/\/www.somewhere.com\/blahblahblah\/",
//       "created_time": "2016-09-23T22:20:29+0000",
//       "id": "12345678901234567_12345678900000009"
//     },
//     { 
//       "message": "At Lincoln marsh ...",
//       "story": "John Doe added 2 new photos.",
//       "created_time": "2016-09-19T02:00:43+0000",
//       "id": "12345678901234567_12345678900000010"
//     },
//     { 
//       "message": "I would've went for a swim had it not been for the sign",
//       "created_time": "2016-09-19T01:59:47+0000",
//       "id": "12345678901234567_12345678900000011"
//     },
//     { 
//       "story": "John Doe shared Steve's video.",
//       "created_time": "2016-09-17T22:00:02+0000",
//       "id": "12345678901234567_12345678900000012"
//     },
//     { 
//       "message": "Another sample message...",
//       "story": "John Doe shared XYZ's post.",
//       "created_time": "2016-09-17T14:13:16+0000",
//       "id": "12345678901234567_12345678900000013"
//     },
//     { 
//       "message": "Hello World!",
//       "created_time": "2016-09-16T23:17:13+0000",
//       "id": "12345678901234567_12345678900000014"
//     },
//     { 
//       "message": "https:\/\/www.youtube.com\/watch?v=xyz",
//       "created_time": "2016-09-15T04:13:02+0000",
//       "id": "12345678901234567_12345678900000015"
//     },
//     { 
//       "story": "John Doe shared Emily's photo.",
//       "created_time": "2016-09-14T16:37:10+0000",
//       "id": "12345678901234567_12345678900000016"
//     },
//     { 
//       "story": "John Doe shared Vincent's photo.",
//       "created_time": "2016-09-14T14:03:42+0000",
//       "id": "12345678901234567_12345678900000017"
//     },
//     { 
//       "message": "https:\/\/www.chilkatsoft.com\/",
//       "created_time": "2016-09-14T02:29:37+0000",
//       "id": "12345678901234567_12345678900000018"
//     },
//     { 
//       "message": "So cool!  Marcus jamming with this 16 year old kid...",
//       "created_time": "2016-09-13T17:04:53+0000",
//       "id": "12345678901234567_12345678900000019"
//     },
//     { 
//       "message": "Wow!",
//       "story": "John Doe shared Somebody's post.",
//       "created_time": "2016-09-13T14:11:18+0000",
//       "id": "12345678901234567_12345678900000020"
//     }
//   ],
//   "paging": { 
//     "previous": "https:\/\/graph.facebook.com\/v2.7\/12345678901234567\/feed?since=1475073405&limit=25&__paging_token=enc_abcT9x9GFabcTxvnyXZC0xnHZCrH2h4yjNZCZAUabcZAI9TyZBibwat6wCYiSFTxR4nSDZAkzaN8vIaEPmqrabc1QTIbGac&__previous=1",
//     "next": "https:\/\/graph.facebook.com\/v2.7\/12345678901234567\/feed?limit=25&until=1473426350&__paging_token=enc_AdDFWabcYtV5ob6lFO8LZAMhm7LKCxntawqqabcZALyC8WZB8Th2lON7HGuJRabzW6Ivfm93LORIw9NNBuHpob7abcjh"
//   }
// }
// 

CkOAuth2_Dispose(oauth2);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkDateTime_Dispose(dtime);

end;