HTTP Resume Download File

Demonstrates how to resume downloading of a partially downloaded file.

Download Chilkat HTTP ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATHTTPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
success: Integer;
localFilename: String;
url: String;

begin
http := TChilkatHttp.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := http.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(http.LastErrorText);
    Exit;
  end;

//  Resume downloading a file.
//  It is assumed that a prior download was interrupted
//  and a partial file already exists on the local filesystem.
//  To download the remainder of the file, call ResumeDownload:
localFilename := 'ChilkatPerl.zip';
url := 'http://www.chilkatsoft.com/download/ChilkatPerl.zip';
success := http.ResumeDownload(url,localFilename);
if (success <> 1) then
  begin
    ShowMessage(http.LastErrorText);
  end
else
  begin
    ShowMessage('Download Complete!');
  end;
end;