Pascal (Lazarus/Delphi)

List all Folders

See more Google Drive Examples

Demonstrates how to retrieve a list of all folders.

Note: Let's say we have a directory tree with the following folders in Google Drive:

/AAWorkArea
/AAWorkArea/FolderA
/AAWorkArea/FolderB
/Folder2
/Folder2/FolderA

This would be our result. Notice that the "name" of each folder is NOT the full path, but just the final folder name. To distinguish between the two FolderA's, we would need to get the parent information for each.

---- Page 1 ----
name: FolderB
id: 1ep8p9wsCV8S_xTI7G1-qEuf8RNO_9250
mimeType: application/vnd.google-apps.folder
-
name: FolderA
id: 1h_BWJGEn7L7aFV5SN8iOKv91uxddTbY8
mimeType: application/vnd.google-apps.folder
-
name: Folder2
id: 1cvDIF78KSDuUyrU_VCKRSRbmENWkHNqV
mimeType: application/vnd.google-apps.folder
-
name: AAWorkArea
id: 0BzXkF-yZEO0-ank3VndfZTZsdlk
mimeType: application/vnd.google-apps.folder
-
name: FolderA
id: 1Fksv-TfA1ILii1YjXsNa1-rDu8Cdrg72
mimeType: application/vnd.google-apps.folder
-

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;
  json: TJsonObject;
  i: Integer;
  numFiles: Integer;
  jsonResponse: string;
  pageNumber: Integer;
  pageToken: string;
  bContinueLoop: Boolean;
  bHasMorePages: Boolean;

begin
  success := False;

  success := True;

  //  This example 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 50 results per page for testing.  (The default page size is 100, with a max of 1000.
  rest.AddQueryParam('pageSize','50');

  //  Get all entries that are folders.
  rest.AddQueryParam('q','mimeType = ''application/vnd.google-apps.folder''');

  json := TJsonObject.Create;
  json.EmitCompact := False;

  //  Send the request for the 1st page.
  jsonResponse := rest.FullRequestNoBody('GET','/drive/v3/files');

  pageNumber := 1;

  bContinueLoop := rest.LastMethodSuccess and (rest.ResponseStatusCode = 200);

  while bContinueLoop = True do
    begin

      WriteLn('---- Page ' + pageNumber + ' ----');

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

      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;

      //  Get the next page of files.
      //  If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
      //  for the next request.   If no "nextPageToken" was present, then this was the last page of files.
      pageToken := json.StringOf('nextPageToken');
      bContinueLoop := False;
      bHasMorePages := json.LastMethodSuccess;
      if (bHasMorePages = True) then
        begin
          rest.ClearAllQueryParams();
          rest.AddQueryParam('pageSize','50');
          rest.AddQueryParam('pageToken',pageToken);
          rest.AddQueryParam('q','mimeType = ''application/vnd.google-apps.folder''');

          jsonResponse := rest.FullRequestNoBody('GET','/drive/v3/files');
          bContinueLoop := rest.LastMethodSuccess and (rest.ResponseStatusCode = 200);
          pageNumber := pageNumber + 1;
        end;

    end;

  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('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response JSON: ' + jsonResponse);
      Exit;
    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.