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Delphi DLL Web API Examples

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(Delphi DLL) Get the Photos for a User

Demonstrates how to get the photos that the user has uploaded.

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;
name: 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.
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);

// 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) <> True) 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;

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'));
    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;

// 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);

end;

 

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