Lazarus Pascal

List Files in Google Drive

See more Google Drive Examples

Demonstrates how to list files in Google Drive.

See Google Drive Files list for more optional HTTP parameters.

Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.AuthGoogle,
  Chilkat.JsonObject,
  Chilkat.Rest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  jsonResponse: string;
  json: TJsonObject;
  numFiles: Integer;
  i: Integer;

begin
  success := False;

  success := True;

  //  It requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  This example uses a previously obtained access token having permission for the 
  //  Google Drive scope.

  gAuth := TAuthGoogle.Create;
  gAuth.AccessToken := 'GOOGLE-DRIVE-ACCESS-TOKEN';

  rest := TRest.Create;

  //  Connect using TLS.
  bAutoReconnect := True;
  success := rest.Connect('www.googleapis.com',443,True,bAutoReconnect);

  //  Provide the authentication credentials (i.e. the access token)
  rest.SetAuthGoogle(gAuth);

  //  Get 4 results per page.  (The default page size is 100, with a max of 1000.
  rest.AddQueryParam('pageSize','4');

  //  This uses the Google Drive V3 API... (not V2)
  jsonResponse := rest.FullRequestNoBody('GET','/drive/v3/files');
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  A successful response will have a status code equal to 200.
  if (rest.ResponseStatusCode <> 200) then
    begin
      WriteLn('request header = ' + rest.LastRequestHeader);
      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response JSON: ' + jsonResponse);
      Exit;
    end;

  //  A successful response looks like this:
  //  {
  //   "kind": "drive#fileList",
  //   "files": [
  //     {
  //       "kind": "drive#file",
  //       "id": "0B53Q6OSTWYolenpjTEU4ekJlQUU",
  //       "name": "test",
  //       "mimeType": "application/vnd.google-apps.folder"
  //     },
  //     {
  //       "kind": "drive#file",
  //       "id": "0B53Q6OSTWYolRm4ycjZtdXhRaEE",
  //       "name": "starfish4.jpg",
  //       "mimeType": "image/jpeg"
  //     },
  //     {
  //       "kind": "drive#file",
  //       "id": "0B53Q6OSTWYolMWt2VzN0Qlo1UjA",
  //       "name": "hamlet2.xml",
  //       "mimeType": "text/xml"
  //     },
  //  ...
  //     {
  //       "kind": "drive#file",
  //       "id": "0B53Q6OSTWYolc3RhcnRlcl9maWxlX2Rhc2hlclYw",
  //       "name": "Getting started",
  //       "mimeType": "application/pdf"
  //     }
  //   ]
  //  }

  //  Iterate over each file in the response and show the name, id, and mimeType.
  json := TJsonObject.Create;
  json.Load(jsonResponse);

  //  Show the full JSON response.
  json.EmitCompact := False;
  WriteLn(json.Emit());

  numFiles := json.SizeOfArray('files');
  i := 0;
  while i < numFiles do
    begin
      json.I := i;
      WriteLn('name: ' + json.StringOf('files[i].name'));
      WriteLn('id: ' + json.StringOf('files[i].id'));
      WriteLn('mimeType: ' + json.StringOf('files[i].mimeType'));
      WriteLn('-');
      i := i + 1;
    end;



  gAuth.Free;
  rest.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.