Delphi DLL

Example: Http.ResumeDownload method

Demonstrates the ResumeDownload method. Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
localFilePath: PWideChar;
statusCode: Integer;
fac: HCkFileAccess;

begin
success := False;

http := CkHttp_Create();
CkHttp_putKeepResponseBody(http,True);

// 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 := CkHttp_Download(http,'https://www.chilkatsoft.com/testData/hamlet_partial.xml',localFilePath);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// Download the remainder of hamlet.xml.
success := CkHttp_ResumeDownload(http,'https://www.chilkatsoft.com/testData/hamlet.xml',localFilePath);
statusCode := CkHttp_getLastStatus(http);
if (success = False) then
  begin
    if (statusCode = 0) then
      begin
        // Unable to either send the request or get the response.
        Memo1.Lines.Add(CkHttp__lastErrorText(http));
      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(CkHttp__lastResponseBody(http));
      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 := CkFileAccess_Create();
Memo1.Lines.Add('size of hamlet.xml: ' + IntToStr(CkFileAccess_FileSize(fac,localFilePath)));

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

CkHttp_Dispose(http);
CkFileAccess_Dispose(fac);

end;