Delphi ActiveX

Example: Http.ResumeDownload method

Demonstrates the ResumeDownload method. Delphi ActiveX

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
success: Integer;
http: TChilkatHttp;
localFilePath: WideString;
statusCode: Integer;
fac: TCkFileAccess;

begin
success := 0;

http := TChilkatHttp.Create(Self);
http.KeepResponseBody := 1;

// To demonstrate resuming a download, we've created a file on the chilkatsoft.com
// web server that contains the first 82,379 bytes of the full  279,658 bytes of the hamlet.xml file.

// We'll first download the partial file, and pretend it was a previous incomplete attempt to download the entire file.
localFilePath := 'c:/temp/qa_output/hamlet.xml';
success := http.Download('https://www.chilkatsoft.com/testData/hamlet_partial.xml',localFilePath);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// Download the remainder of hamlet.xml.
success := http.ResumeDownload('https://www.chilkatsoft.com/testData/hamlet.xml',localFilePath);
statusCode := http.LastStatus;
if (success = 0) then
  begin
    if (statusCode = 0) then
      begin
        // Unable to either send the request or get the response.
        Memo1.Lines.Add(http.LastErrorText);
      end
    else
      begin
        // We got a response, but the status code was not in the 200s
        Memo1.Lines.Add('Response status code: ' + IntToStr(statusCode));
        // Examine the response body.
        Memo1.Lines.Add('Response body:');
        Memo1.Lines.Add(http.LastResponseBody);
      end;
    Memo1.Lines.Add('Download failed.');

  end
else
  begin
    Memo1.Lines.Add('Download success, response status = ' + IntToStr(statusCode));
  end;

// The hamlet.xml file should be 279,658 bytes
fac := TCkFileAccess.Create(Self);
Memo1.Lines.Add('size of hamlet.xml: ' + IntToStr(fac.FileSize(localFilePath)));

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