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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, FileAccess, Task, BinData, Ftp2, Stream;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: HCkFtp2;
success: Boolean;
fac: HCkFileAccess;
streamObj: HCkStream;
t: HCkTask;
bd: HCkBinData;

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

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'www.my-ftp-server.com');
CkFtp2_putUsername(ftp,'mFtpLogin');
CkFtp2_putPassword(ftp,'myFtpPassword');
CkFtp2_putAuthTls(ftp,True);
CkFtp2_putPassive(ftp,True);

// Connect and login to the FTP server using TLS.
success := CkFtp2_Connect(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

// We'll read the incoming data chunk-by-chunk and write to an output file.
fac := CkFileAccess_Create();
success := CkFileAccess_OpenForWrite(fac,'qa_output/penguins2.jpg');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

streamObj := CkStream_Create();

// Create a task to do the FTP download.
t := CkFtp2_GetFileToStreamAsync(ftp,'penguins2.jpg',streamObj);
if (CkFtp2_getLastMethodSuccess(ftp) <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

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

bd := CkBinData_Create();
while CkStream_getEndOfStream(streamObj) <> True do
  begin
    // Get the next chunk of JPG bytes.
    CkStream_ReadBd(streamObj,bd);
    // Do something with it..
    // In this simple example, we'll just write to the file.
    CkFileAccess_FileWriteBd(fac,bd,0,0);
    // Clear for the next read.
    CkBinData_Clear(bd);
  end;

CkFileAccess_FileClose(fac);

CkTask_Dispose(t);

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

CkFtp2_Dispose(ftp);
CkFileAccess_Dispose(fac);
CkStream_Dispose(streamObj);
CkBinData_Dispose(bd);

end;