Lazarus Pascal

Delete All Files

See more Google Drive Examples

Permanently deletes all files owned by the user without moving it to the trash.

This example works by first getting a list of all fileIds, and then iterating over the list to delete each file.

See Google Drive Files delete for more information.

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.StringArray,
  Chilkat.AuthGoogle,
  Chilkat.StringBuilder,
  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;
  fileId: string;
  saFileIds: TStringArray;
  bHasMorePages: Boolean;
  sbPath: TStringBuilder;

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 10 results per page for testing.  (The default page size is 100, with a max of 1000.
  rest.AddQueryParam('pageSize','10');

  json := TJsonObject.Create;

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

  pageNumber := 1;

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

  saFileIds := TStringArray.Create;

  while bContinueLoop = True do
    begin

      WriteLn('---- Page ' + pageNumber + ' ----');
      json.Load(jsonResponse);

      numFiles := json.SizeOfArray('files');
      i := 0;
      while i < numFiles do
        begin
          json.I := i;
          fileId := json.StringOf('files[i].id');
          WriteLn('name: ' + json.StringOf('files[i].name'));
          WriteLn('id: ' + fileId);
          saFileIds.Append(fileId);
          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','10');
          rest.AddQueryParam('pageToken',pageToken);
          jsonResponse := rest.FullRequestNoBody('GET','/drive/v3/files');
          bContinueLoop := rest.LastMethodSuccess and (rest.ResponseStatusCode = 200);
          pageNumber := pageNumber + 1;
        end;

    end;

  //  Before actually deleting, check for errors...
  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;

  //  OK, we have the full list of files.  Delete each..
  sbPath := TStringBuilder.Create;
  numFiles := saFileIds.Count;
  i := 0;
  while i < numFiles do
    begin
      fileId := saFileIds.GetString(i);

      rest.ClearAllQueryParams();

      sbPath.Clear();
      sbPath.Append('/drive/v3/files/');
      sbPath.Append(fileId);

      jsonResponse := rest.FullRequestNoBody('DELETE',sbPath.GetAsString());
      if (rest.LastMethodSuccess <> True) then
        begin
          WriteLn(rest.LastErrorText);
          Exit;
        end;

      //  A successful response will have a status code equal to 204 and the response body is empty.
      //  (If not successful, then there should be a JSON response body with information..)
      if (rest.ResponseStatusCode <> 204) 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;

      i := i + 1;
      WriteLn(i + ': Deleted ' + fileId);
    end;

  WriteLn('All Files Deleted.');


  gAuth.Free;
  rest.Free;
  json.Free;
  saFileIds.Free;
  sbPath.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.