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(Delphi DLL) SFTP Resume Download

Demonstrates how to resume an SFTP download from a previous partial download.

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, SFtp;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sftp: HCkSFtp;
success: Boolean;
port: Integer;
hostname: PWideChar;
remoteFilePath: PWideChar;
localFilePath: PWideChar;

begin
//  Important: It is helpful to send the contents of the
//  sftp.LastErrorText property when requesting support.

sftp := CkSFtp_Create();

//  Any string automatically begins a fully-functional 30-day trial.
success := CkSFtp_UnlockComponent(sftp,'Anything for 30-day trial');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Set some timeouts, in milliseconds:
CkSFtp_putConnectTimeoutMs(sftp,5000);
CkSFtp_putIdleTimeoutMs(sftp,10000);

//  Connect to the SSH server.
//  The standard SSH port = 22
//  The hostname may be a hostname or IP address.

hostname := 'www.my-ssh-server.com';
port := 22;
success := CkSFtp_Connect(sftp,hostname,port);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Authenticate with the SSH server.  Chilkat SFTP supports
//  both password-based authenication as well as public-key
//  authentication.  This example uses password authenication.
success := CkSFtp_AuthenticatePw(sftp,'myLogin','myPassword');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  After authenticating, the SFTP subsystem must be initialized:
success := CkSFtp_InitializeSftp(sftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  Download the file:

localFilePath := 'c:/temp/hamlet.xml';
remoteFilePath := 'subdir1/subdir2/hamlet.xml';
//  The ResumeDownloadFileByName method will check
//  the local file and begin downloading the remote file
//  at the appropriate point.  For example, if the local
//  file is already 215624 bytes long, it will begin downloading
//  the remote file at the 215625'th byte -- appending to
//  the local file.
success := CkSFtp_ResumeDownloadFileByName(sftp,remoteFilePath,localFilePath);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

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

CkSFtp_Dispose(sftp);

end;

 

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