Delphi ActiveX

Get a Remote FTP File's Size by Name

Demonstrates the Chilkat Ftp2.GetSizeByName method, which returns the size in bytes of a named file in the current remote directory as a 32-bit integer. The only argument is the filename — a name, not a path. It returns -1 when the file is not found or the size cannot be obtained.

Background: This is the direct way to get one file's size when you already know its name, typically via a SIZE command — no full directory listing required. Because the result is 32-bit, it cannot represent files past about 2 GB; use GetSizeStrByName for large files. The argument must be a bare filename in the current directory, so ChangeRemoteDir to the right place first.

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var
success: Integer;
ftp: TChilkatFtp2;
fileSize: Integer;

begin
success := 0;

//  Demonstrates the Ftp2.GetSizeByName method, which returns the size in bytes of a named file in
//  the current remote directory as a 32-bit integer.  The only argument is the filename (a name,
//  not a path).

ftp := TChilkatFtp2.Create(Self);

ftp.Hostname := 'ftp.example.com';
ftp.Username := 'myFtpLogin';

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ftp.Password := 'myPassword';

success := ftp.Connect();
if (success = 0) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

success := ftp.ChangeRemoteDir('public_html');
if (success = 0) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

//  Returns -1 when the file is not found or the size cannot be obtained.  For files that may
//  exceed 2 GB, use GetSizeStrByName (returns a decimal string).
fileSize := ftp.GetSizeByName('report.pdf');
if (fileSize < 0) then
  begin
    Memo1.Lines.Add('File not found, or size unavailable.');
    Exit;
  end;
Memo1.Lines.Add('report.pdf is ' + IntToStr(fileSize) + ' bytes');

success := ftp.Disconnect();
if (success = 0) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;