Pascal (Lazarus/Delphi)

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.

Pascal (Lazarus/Delphi)

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.