(Delphi ActiveX) Bandwidth Throttled Asynchronous HTTP Upload

Demonstrates how to do an HTTP upload asynchronously in a background thread with limiting the rate to an approximate number of bytes/second. The only difference between this example and one without bandwidth throttling is that the BandwidthThrottleUp property is set.

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

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
upload: TChilkatUpload;
success: Integer;

begin
upload := TChilkatUpload.Create(Self);

// Specify the page (ASP, ASP.NET, Perl, Python, Ruby, CGI, etc)
// that will process the HTTP Upload.
upload.Hostname := 'www.mywebserver.com';
upload.Path := '/receiveUpload.aspx';

// Add one or more files to be uploaded.
upload.AddFileReference('file1','dude.gif');
upload.AddFileReference('file2','pigs.xml');
upload.AddFileReference('file3','sample.doc');

// Set the BandwidthThrottleUp property to throttle to approx 64K/second
upload.BandwidthThrottleUp := 65536;

// Begin the HTTP upload in a background thread:
success := upload.BeginUpload();
if (success <> 1) then
  begin
    Memo1.Lines.Add(upload.LastErrorText);
  end
else
  begin
    Memo1.Lines.Add('Upload started...');
  end;

// Wait for the upload to finish.
// Print the progress as we wait...
while (upload.UploadInProgress = 1) do
  begin
    // We can abort the upload at any point by calling:
    // upload.AbortUpload();

    // Display the percentage complete and the number of bytes uploaded so far..
    // The total upload size will become set after the upload begins:
    Memo1.Lines.Add(IntToStr(upload.PercentUploaded) + '% ' + IntToStr(upload.NumBytesSent) + '/' + IntToStr(upload.TotalUploadSize));

    // Sleep 2/10ths of a second.
    upload.SleepMs(200);

  end;

// Did the upload succeed?
if (upload.UploadSuccess = 1) then
  begin
    Memo1.Lines.Add('Files uploaded!');
  end
else
  begin
    Memo1.Lines.Add(upload.LastErrorText);
  end;
end;