Pascal (Lazarus/Delphi)

Referencing a Pre-Uploaded File by file_id in an AI Request

See more AI Examples

Some AI proviers have a Files API that lets you upload content once and then reference it later in generation requests using a file_id. This is especially useful for large documents, reuse across multiple prompts, or keeping inputs structured and separate from your prompt text.

This example demonstrates how to use a file_id in a request.

Pascal (Lazarus/Delphi)

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.Ai,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ai: TAi;
  file_id: string;
  sbResponse: TStringBuilder;

begin
  success := False;

  success := False;

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

  ai := TAi.Create;

  //  The provider can be "openai", "google", "claude", "mistral", "deepseek", "xai", or any provider
  //  that supports referencing pre-uploaded files by a file_id (or file uri).
  ai.Provider := 'openai';

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

  //  Choose a model.
  ai.Model := 'gpt-5-mini';

  //  See the following example showing how to upload a file
  //  Upload a File to an AI Provider (OpenAI, Google, Antropic, X)

  //  Use the file_id of the pre-uploaded file.
  file_id := 'file-5G2xncrEiHbVfYPRpFgP9c';
  ai.InputAddFileId(file_id,'application/json');

  ai.InputAddText('Explain why Hamlet delays taking revenge, using only evidence from the file.');

  //  Ask the AI for text output.
  success := ai.Ask('text');
  if (success = False) then
    begin
      WriteLn(ai.LastErrorText);
      Exit;
    end;

  //  Get the text response.
  sbResponse := TStringBuilder.Create;
  ai.GetOutputTextSb(sbResponse);
  WriteLn(sbResponse.GetAsString());


  ai.Free;
  sbResponse.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.