Delphi DLL

Monitor FTP Transfer Progress

Demonstrates the progress properties CurBytesReceived, CurBytesReceivedStr, CurBytesSent, CurBytesSentStr, ProgressMonSize, PercentDoneScale, and AutoGetSizeForProgress.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Percentage progress needs a known total, but FTP does not always report a file's size up front — so AutoGetSizeForProgress issues a SIZE command before a download, and ProgressMonSize supplies an expected size when even that is unavailable (a one-shot value consumed by the next transfer). PercentDoneScale sets the resolution of progress callbacks. The current byte counts are exposed both as 32-bit integers and as strings, the string forms avoiding integer-width limits for very large transfers.

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Delphi DLL

var
success: Boolean;
ftp: HCkFtp2;

begin
success := False;

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;

//  AutoGetSizeForProgress sends a SIZE command before a download so percentage-based progress can
//  be computed.
CkFtp2_putAutoGetSizeForProgress(ftp,True);

//  PercentDoneScale sets the value representing one hundred percent in PercentDone callbacks.
//  1000 gives tenth-of-a-percent resolution.
CkFtp2_putPercentDoneScale(ftp,1000);

//  ProgressMonSize is a one-shot expected size for the next download when the size is not
//  otherwise known.  It is consumed by the next download and reset to 0.
CkFtp2_putProgressMonSize(ftp,20485760);

success := CkFtp2_GetFile(ftp,'public_html/bigfile.zip','qa_output/bigfile.zip');
if (success = False) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

//  After a transfer, the current byte counts are available as 32-bit numbers or as strings (the
//  string forms avoid integer-size limits).
Memo1.Lines.Add('Bytes received: ' + IntToStr(CkFtp2_getCurBytesReceived(ftp)));
Memo1.Lines.Add('Bytes received (str): ' + CkFtp2__curBytesReceivedStr(ftp));
Memo1.Lines.Add('Bytes sent: ' + IntToStr(CkFtp2_getCurBytesSent(ftp)));
Memo1.Lines.Add('Bytes sent (str): ' + CkFtp2__curBytesSentStr(ftp));

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

CkFtp2_Dispose(ftp);