'Where can I find System.IO to use FileSystemWatcher on Delphi 11?

I need to monitor real time if a new file is created on a folder. System.IO.FileSystemWatcher seems a perfect solution. But on Delphi 11 it is reporting

[dcc32 Fatal Error] F2613 Unit 'System.IO' not found.

Do I have to download something to have the .pas unit?

P.S. I have explored using the windows API FindFirstChangeNotification but this does not provide the filename created.

delphi-11-alexandria


Solution 1:[1]

System.IO.FileSystemWatcher is a .net class and not part of the Delphi RTL. Therefore you won't find it anywhere.

I think the API function you need is ReadDirectoryChangesW.

Solution 2:[2]

You can also use DDNRuntime(Delphi .NET Framework/.NET Core Runtime)

https://github.com/ying32/DDNRuntime-examples

It can help you call .net fuctions easyly

Just like

procedure TestMemoryStream;
var
  LMem: DNMemoryStream;
  LBytes: TArray<Byte>;
  B: Byte;
  LReadLen: Integer;
begin
  LMem := TDNMemoryStream.Create;
  
  LMem.Write([1,2,3,4,5], 0, 5);
  LMem.WriteByte(121);
  LMem.Flush;
  LMem.Position := 0;

  Writeln('data Length: ', LMem.Length);
  SetLength(LBytes, LMem.Length);
  LReadLen :=  LMem.Read(LBytes, 0, Length(LBytes));
  Writeln('len: ', LReadLen);
  for b in LBytes do
    Write(b, ' ');
  Writeln;
end;

Sources

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Source: Stack Overflow

Solution Source
Solution 1 David Heffernan
Solution 2

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