(Delphi ActiveX) FTP Download Binary File to a Stream

Demonstrates how to FTP download a binary file to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
fac: TCkFileAccess;
streamObj: TChilkatStream;
t: IChilkatTask;
bd: TChilkatBinData;

begin
// This example assumes the Chilkat FTP2 API to have been previously unlocked.
// See FTP2 Unlock Sample for sample code.

ftp := TChilkatFtp2.Create(Self);

ftp.Hostname := 'www.my-ftp-server.com';
ftp.Username := 'mFtpLogin';
ftp.Password := 'myFtpPassword';
ftp.AuthTls := 1;
ftp.Passive := 1;

// Connect and login to the FTP server using TLS.
success := ftp.Connect();
if (success <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

// We'll read the incoming data chunk-by-chunk and write to an output file.
fac := TCkFileAccess.Create(Self);
success := fac.OpenForWrite('qa_output/penguins2.jpg');
if (success <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;

streamObj := TChilkatStream.Create(Self);

// Create a task to do the FTP download.
t := ftp.GetFileToStreamAsync('penguins2.jpg',streamObj.ControlInterface);
if (ftp.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

// Start the task in a background thread.
t.Run();

bd := TChilkatBinData.Create(Self);
while streamObj.EndOfStream <> 1 do
  begin
    // Get the next chunk of JPG bytes.
    streamObj.ReadBd(bd.ControlInterface);
    // Do something with it..
    // In this simple example, we'll just write to the file.
    fac.FileWriteBd(bd.ControlInterface,0,0);
    // Clear for the next read.
    bd.Clear();
  end;

fac.FileClose();

Memo1.Lines.Add('Success.');
end;