Lazarus Pascal Requires Chilkat v11.4.0+
Lazarus Pascal
Streaming AI with Manual AI Tool Function Calling
See more AI Examples
Demonstrates how to get AI responses in streaming mode, including manual tool function calls.Chilkat Lazarus Pascal Downloads
program ChilkatDemo;
// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}
uses
{$IFDEF UNIX}
cthreads,
{$ENDIF}
SysUtils,
CkDllLoader,
Chilkat.StringBuilder,
Chilkat.Ai,
Chilkat.JsonObject;
// ---------------------------------------------------------------------------
procedure RunDemo;
var
success: Boolean;
jsonTools: TJsonObject;
toolIdx: Integer;
ai: TAi;
conversation_name: string;
sysMessage: string;
devMessage: string;
sbEventName: TStringBuilder;
sbDelta: TStringBuilder;
sbFullResponse: TStringBuilder;
maxWaitMs: Integer;
jsonFn: TJsonObject;
finished: Boolean;
numAsks: Integer;
madeFunctionCalls: Boolean;
streamingDone: Boolean;
result: Integer;
numFnCalls: Integer;
fn_idx: Integer;
sbFnName: TStringBuilder;
callId: string;
zodiac_sign: string;
applicationFnCallResult: string;
begin
success := False;
// Create the following JSON to define tool functions available for the AI to use.
// Note: You'll use the following JSON format regardless of the AI provider, whether
// it be ChatGPT, Gemini, Claude, Grok, etc. Chilkat automatically converts to the required
// format needed for a given AI provider.
// In this example, the application is providing a single function the AI may choose to call.
// {
// "tools": [
// {
// "name": "get_horoscope",
// "description": "Get today's horoscope for an astrological sign.",
// "parameters": {
// "properties": {
// "sign": {
// "type": "string",
// "description": "An astrological sign like Taurus or Aquarius"
// }
// }
// }
// }
// ]
// }
jsonTools := TJsonObject.Create;
toolIdx := 0;
jsonTools.I := toolIdx;
jsonTools.UpdateString('tools[i].name','get_horoscope');
jsonTools.UpdateString('tools[i].description','Get today''s horoscope for an astrological sign.');
jsonTools.UpdateString('tools[i].parameters.properties.sign.type','string');
jsonTools.UpdateString('tools[i].parameters.properties.sign.description','An astrological sign like Taurus or Aquarius');
// More tools can be added as desired..
jsonTools.EmitCompact := False;
WriteLn(jsonTools.Emit());
ai := TAi.Create;
// Register the tools that will be made available to the AI.
ai.RegisterManualTools(jsonTools);
// The provider can be "openai", "google", "claude", "grok", "mistral", "custom", etc.
ai.Provider := 'openai';
// Use your provider's API key.
ai.ApiKey := 'MY_API_KEY';
// Choose a model.
ai.Model := 'gpt-5.6-luna';
// Tool function calling must always occur within a conversation.
conversation_name := 'convo_astrology';
sysMessage := 'You are a helpful astrologer';
devMessage := 'Respond only with markdown.';
ai.NewConvo(conversation_name,sysMessage,devMessage);
// Provide inputs
ai.InputAddText('What is my horoscope? I am an Aquarius.');
// Get the response in streaming mode.
ai.Streaming := True;
// In streaming mode, if we receive an AI event that is a request for tool use,
// we'll need to make the call to the JavaScript and then continue with a followup Ask,
// until the final response is received.
sbEventName := TStringBuilder.Create;
sbDelta := TStringBuilder.Create;
sbFullResponse := TStringBuilder.Create;
// When PollAi returns with an event, it's highly unlikely the
// call to NextAiEvent does not immediately return. Setting a max
// timeout is just a precaution..
maxWaitMs := 5000;
jsonFn := TJsonObject.Create;
finished := False;
numAsks := 0;
// Set a max # of followup Asks to prevent any unexpected infinite looping.
while not finished and (numAsks < 10) do
begin
// Send the request to the AI model.
success := ai.Ask('text');
if (success = False) then
begin
WriteLn(ai.LastErrorText);
Exit;
end;
madeFunctionCalls := False;
streamingDone := False;
while not streamingDone do
begin
result := ai.PollAi(False);
if (result < 0) then
begin
WriteLn(ai.LastErrorText);
WriteLn('Failed.');
Exit;
end;
if (result > 0) then
begin
// We have an event..
success := ai.NextAiEvent(maxWaitMs,sbEventName,sbDelta);
if (success = False) then
begin
WriteLn(ai.LastErrorText);
Exit;
end;
// Is this an event where the AI is requesting a function call?
if (sbEventName.ContentsEqual('function_call',True)) then
begin
jsonFn.LoadSb(sbDelta);
// Note: Chilkat will convert responses from all AI providers to this format:
// {
// "function_call": [
// {
// "name": "get_horoscope",
// "call_id": "call_RYmeysYQFocFc7Z2ofkv61dW",
// "arguments": "{\"sign\":\"Aquarius\"}",
// "args": {
// "sign": "Aquarius"
// }
// }
// ]
// }
numFnCalls := jsonFn.SizeOfArray('function_call');
fn_idx := 0;
while (fn_idx < numFnCalls) do
begin
jsonFn.I := fn_idx;
sbFnName := TStringBuilder.Create;
jsonFn.StringOfSb('function_call[i].name',sbFnName);
callId := jsonFn.StringOf('function_call[i].call_id');
if (sbFnName.ContentsEqual('get_horoscope',True) = True) then
begin
// The get_horoscope function (as defined above) has one argument named "sign".
zodiac_sign := jsonFn.StringOf('function_call[i].args.sign');
WriteLn('zodiac_sign = ' + zodiac_sign);
// Insert application code here to call your app's get_horoscope function, passing the zodiac_sign to it..
// For this example, we'll pretend the app's get_horoscope function returned the following:
applicationFnCallResult := 'Aquarius: Next Tuesday you will befriend a baby otter.';
// Provide the tool call result as an input for the followup Ask.
ai.InputAddFnResult(callId,applicationFnCallResult);
madeFunctionCalls := True;
end;
// Your application would add code to check for and handle each possible function call.
fn_idx := fn_idx + 1;
end;
end
else
begin
if (not sbEventName.ContentsEqual('empty',True)) then
begin
sbFullResponse.AppendSb(sbDelta);
if (sbEventName.ContentsEqual('null_terminator',True)) then
begin
streamingDone := True;
end;
end;
end;
end
else
begin
// No event arrived, so wait a short time rather than spin in a loop..
ai.SleepMs(100);
end;
end;
if (not madeFunctionCalls) then
begin
finished := True;
end;
numAsks := numAsks + 1;
end;
WriteLn('Full Response:');
WriteLn(sbFullResponse.GetAsString());
jsonTools.Free;
ai.Free;
sbEventName.Free;
sbDelta.Free;
sbFullResponse.Free;
jsonFn.Free;
sbFnName.Free;
end;
// ---------------------------------------------------------------------------
begin
try
RunDemo;
except
on E: Exception do
WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
end;
WriteLn;
{$IFDEF MSWINDOWS}
WriteLn('Press Enter to exit...');
ReadLn;
{$ENDIF}
end.