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Delphi DLL Web API Examples

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(Delphi DLL) Iterate Pages in Feed

Demonstrates how to read the next page in the user's Facebook feed, and iterates through all of the pages in the Facebook feed.

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, Url, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
oauth2: HCkOAuth2;
rest: HCkRest;
success: Boolean;
responseJson: PWideChar;
json: HCkJsonObject;
nextUrl: HCkUrl;
nextUrlStr: 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);

// Gets the 1st page in the user's feed.
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);

// 
// See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.
// 

nextUrl := CkUrl_Create();

// Get the URL for the next page in the feed.
nextUrlStr := CkJsonObject__stringOf(json,'paging.next');
while CkJsonObject_getLastMethodSuccess(json) = True do
  begin

    Memo1.Lines.Add('Next page URL: ' + nextUrlStr);

    CkUrl_ParseUrl(nextUrl,nextUrlStr);

    // Prepare for getting the next page in the feed.
    // We can continue using the same REST object.
    // If already connected, we'll continue using the existing connection.
    // Otherwise, a new connection will automatically be made if needed.
    CkRest_ClearAllQueryParams(rest);
    CkRest_AddQueryParams(rest,CkUrl__query(nextUrl));

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

    CkJsonObject_Load(json,responseJson);
    // See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.

    // Get the URL for the next page.
    nextUrlStr := CkJsonObject__stringOf(json,'paging.next');
  end;

Memo1.Lines.Add('No more pages in the feed.');

CkOAuth2_Dispose(oauth2);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkUrl_Dispose(nextUrl);

end;

 

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