Delphi DLL

Get an FTP Listing Entry's Last-Modified Time

Demonstrates the Chilkat Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a cached directory-listing entry as an RFC 822 date-time string. The only argument is a zero-based index.

Background: The last-modified time is the workhorse timestamp: it updates whenever a file's contents change and is what sync and mirror logic compares to decide whether a file needs re-transferring. It is the most reliably reported of the three across FTP servers, and the RFC 822 string carries a timezone so comparisons are well defined.

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var
success: Boolean;
ftp: HCkFtp2;
n: Integer;
i: Integer;
name: PWideChar;
lastModified: PWideChar;

begin
success := False;

//  Demonstrates the Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a
//  cached directory-listing entry as an RFC 822 date-time string.  The only argument is a
//  zero-based index.

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'ftp.example.com');
CkFtp2_putUsername(ftp,'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.
CkFtp2_putPassword(ftp,'myPassword');

success := CkFtp2_Connect(ftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

success := CkFtp2_ChangeRemoteDir(ftp,'public_html');
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

//  GetDirCount retrieves the directory listing on the first call and returns the number of
//  entries.  A negative return indicates failure.
n := CkFtp2_GetDirCount(ftp);
if (n < 0) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

for i := 0 to n - 1 do
  begin
    name := CkFtp2__getFilename(ftp,i);

    //  The value is an RFC 822 string such as "Fri, 21 Nov 1997 09:55:06 -0600".
    lastModified := CkFtp2__getLastModifiedTimeStr(ftp,i);
    Memo1.Lines.Add(name + '  modified ' + lastModified);
  end;

success := CkFtp2_Disconnect(ftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

CkFtp2_Dispose(ftp);