Delphi DLL

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.

Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
ai: HCkAi;
file_id: PWideChar;
sbResponse: HCkStringBuilder;

begin
success := False;

success := False;

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

ai := CkAi_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).
CkAi_putProvider(ai,'openai');

// Use your provider's API key.
CkAi_putApiKey(ai,'MY_API_KEY');

// Choose a model.
CkAi_putModel(ai,'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';
CkAi_InputAddFileId(ai,file_id,'application/json');

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

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

// Get the text response.
sbResponse := CkStringBuilder_Create();
CkAi_GetOutputTextSb(ai,sbResponse);
Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponse));

CkAi_Dispose(ai);
CkStringBuilder_Dispose(sbResponse);

end;