Delphi DLL

Get the Photos for a User

See more Facebook Examples

Demonstrates how to get the photos that the user has uploaded. Delphi 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
success: Boolean;
oauth2: HCkOAuth2;
rest: HCkRest;
responseJson: PWideChar;
json: HCkJsonObject;
dtime: HCkDateTime;
bLocalTime: Boolean;
dt: HCkDtObj;
i: Integer;
numItems: Integer;
name: PWideChar;

begin
success := False;

// 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.
success := CkRest_Connect(rest,'graph.facebook.com',443,True,True);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

// Indicate that we only want the photos the user has personally uploaded.
CkRest_AddQueryParam(rest,'type','uploaded');

// We could limit the number of photos by setting a limit.
CkRest_AddQueryParam(rest,'limit','5');

// Gets 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.
responseJson := CkRest__fullRequestNoBody(rest,'GET','/v2.7/me/photos');
if (CkRest_getLastMethodSuccess(rest) = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

dt := CkDtObj_Create();
i := 0;
numItems := CkJsonObject_SizeOfArray(json,'data');
while i < numItems do
  begin
    CkJsonObject_putI(json,i);
    Memo1.Lines.Add('--- ' + IntToStr(i));
    name := CkJsonObject__stringOf(json,'data[i].name');
    if (CkJsonObject_getLastMethodSuccess(json) = True) then
      begin
        Memo1.Lines.Add('name: ' + name);
      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'));
    CkDateTime_ToDtObj(dtime,bLocalTime,dt);

    Memo1.Lines.Add(IntToStr(CkDtObj_getMonth(dt)) + '/' + IntToStr(CkDtObj_getDay(dt)) + '/' + IntToStr(CkDtObj_getYear(dt)) + '  '
         + IntToStr(CkDtObj_getHour(dt)) + ':' + IntToStr(CkDtObj_getMinute(dt)));
    i := i + 1;
  end;

// We can get the paging information as follows:
Memo1.Lines.Add('URL for next page: ' + CkJsonObject__stringOf(json,'paging.next'));
Memo1.Lines.Add('before cursor: ' + CkJsonObject__stringOf(json,'paging.cursors.before'));
Memo1.Lines.Add('after cursor: ' + CkJsonObject__stringOf(json,'paging.cursors.after'));

// This is a sample JSON response:
// { 
//   "data": [
//     {
//       "created_time": "2016-09-29T20:46:18+0000",
//       "name": "Ignore my posts -- I'm doing some testing for Facebook related programming...",
//       "id": "10210199026347451"
//     },
//     { 
//       "created_time": "2016-09-19T02:00:42+0000",
//       "id": "10210091531240138"
//     },
//     { 
//       "created_time": "2016-09-19T02:00:42+0000",
//       "id": "10210091520620125"
//     },
//     { 
//       "created_time": "2016-09-19T01:59:46+0000",
//       "name": "I would've went for a swim had it not been for the sign",
//       "id": "10210091522299917"
//     },
//     { 
//       "created_time": "2016-09-12T00:37:35+0000",
//       "id": "10210023316834798"
//     }
//   ],
//   "paging": { 
//     "cursors": { 
//       "before": "MTAyMTAxOTkwMjYzNDc0NTEZD",
//       "after": "MTAyMTAwMjMzMTU4MzQ3OTgZD"
//     },
//     "next": "https:\/\/graph.facebook.com\/v2.7\/10224048320139890\/photos?type=uploaded&limit=5&after=MTAyMTAwMjMzMTU4MzQ3OTgZD"
//   }
// }
// 

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

end;