(Delphi ActiveX) Conversation with Streaming Responses

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Note: This example requires Chilkat v11.2.0 or greater.

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
success: Integer;
ai: TChilkatAi;
systemMsg: WideString;
developerMsg: WideString;
conversationName: WideString;
sbEventName: TChilkatStringBuilder;
sbDelta: TChilkatStringBuilder;
sbFullResponse: TChilkatStringBuilder;
finished: Integer;
abortFlag: Integer;
maxWaitMs: Integer;
result: Integer;
result: Integer;

begin
success := 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

ai := TChilkatAi.Create(Self);

// The provider can be "openai", "google", "claude", "deepseek", "xai", or "perplexity".
// Support for additional providers will be added in future versions of Chilkat.
ai.Provider := 'google';

// Use your provider's API key.
ai.ApiKey := 'MY_API_KEY';

// Choose a model.
ai.Model := 'gemini-2.5-flash';

// Indicate streaming mode is to be used.
ai.Streaming := 1;

// Create a new conversation to be maintained locally in memory.
// If the conversation is the first to be created, it is also automatically selected.
systemMsg := 'You are a creative storyteller';
developerMsg := '';
conversationName := 'test_conversation';
ai.NewConvo(conversationName,systemMsg,developerMsg);

// Add a text input.
ai.InputAddText('Write a detailed story about a turtle who decides to run a bakery.  Describe the setting, the kinds of pastries, how the turtle feels, and include at least three paragraphs.');

// Ask the AI for text output.
success := ai.Ask('text');
if (success = 0) then
  begin
    Memo1.Lines.Add(ai.LastErrorText);
    Exit;
  end;

sbEventName := TChilkatStringBuilder.Create(Self);
sbDelta := TChilkatStringBuilder.Create(Self);
sbFullResponse := TChilkatStringBuilder.Create(Self);
finished := 0;
abortFlag := 0;
maxWaitMs := 5000;

while not finished do
  begin

    result := ai.PollAi(abortFlag);
    if (result = 1) then
      begin
        // We have output waiting.  It should be instantly available.  The maxWaitMs is just-in-case.
        success := ai.NextAiEvent(maxWaitMs,sbEventName.ControlInterface,sbDelta.ControlInterface);
        if (success = 0) then
          begin
            Memo1.Lines.Add(ai.LastErrorText);
            Exit;
          end;

        // Some AI providers send many "empty" events.  Just ignore them.
        if (not sbEventName.ContentsEqual('empty',1)) then
          begin

            // The delta contains the new output.  This could be emitted to a display or the terminal
            // as real-time output.
            if (sbEventName.ContentsEqual('delta',1)) then
              begin
                // This example will emit each delta to its own line.
                Memo1.Lines.Add(sbDelta.GetAsString());

                // Accumulate the delta's so we can show the full response later.
                sbFullResponse.AppendSb(sbDelta.ControlInterface);
              end
            else
              begin
                // A streaming AI response is always terminated by a single "null_terminator" event.
                finished := sbEventName.ContentsEqual('null_terminator',1);
              end;
          end;
      end
    else
      begin
        if (result = 0) then
          begin
            // Nothing is immediately available. Sleep for 1/10 of a second before polling again.
            ai.SleepMs(100);
          end
        else
          begin
            // Something failed..
            Memo1.Lines.Add(ai.LastErrorText);
            finished := 1;
          end;
      end;
  end;

// -------------------------------------------------------------
// The response is in markdown format.
// Also see Markdown to HTML Conversion Examples.
// -------------------------------------------------------------

// Show the accumulated (full) response.
Memo1.Lines.Add('----');
Memo1.Lines.Add(sbFullResponse.GetAsString());
Memo1.Lines.Add('----');

// ----------------------------------------------------------------------------------------------------------
// For the 2nd request in this conversation, ask for a shorter version of the story.
ai.InputAddText('Rewrite the story, but this time make it shorter, about one third as long.');
success := ai.Ask('text');
if (success = 0) then
  begin
    Memo1.Lines.Add(ai.LastErrorText);
    Exit;
  end;

sbFullResponse.Clear();
finished := 0;

while not finished do
  begin

    result := ai.PollAi(abortFlag);
    if (result = 1) then
      begin
        // We have output waiting.  It should be instantly available.  The maxWaitMs is just-in-case.
        success := ai.NextAiEvent(maxWaitMs,sbEventName.ControlInterface,sbDelta.ControlInterface);
        if (success = 0) then
          begin
            Memo1.Lines.Add(ai.LastErrorText);
            Exit;
          end;

        // Some AI providers send many "empty" events.  Just ignore them.
        if (not sbEventName.ContentsEqual('empty',1)) then
          begin

            // The delta contains the new output.  This could be emitted to a display or the terminal
            // as real-time output.
            if (sbEventName.ContentsEqual('delta',1)) then
              begin
                // This example will emit each delta to its own line.
                Memo1.Lines.Add(sbDelta.GetAsString());

                // Accumulate the delta's so we can show the full response later.
                sbFullResponse.AppendSb(sbDelta.ControlInterface);
              end
            else
              begin
                // A streaming AI response is always terminated by a single "null_terminator" event.
                finished := sbEventName.ContentsEqual('null_terminator',1);
              end;
          end;
      end
    else
      begin
        if (result = 0) then
          begin
            // Nothing is immediately available. Sleep for 1/10 of a second before polling again.
            ai.SleepMs(100);
          end
        else
          begin
            // Something failed..
            Memo1.Lines.Add(ai.LastErrorText);
            finished := 1;
          end;
      end;
  end;

Memo1.Lines.Add('----');
Memo1.Lines.Add(sbFullResponse.GetAsString());
end;