Visual FoxPro

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

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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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loAi
LOCAL lcFile_id
LOCAL loSbResponse

lnSuccess = 0

lnSuccess = 0

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

loAi = CreateObject('Chilkat.Ai')

* 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).
loAi.Provider = "openai"

* Use your provider's API key.
loAi.ApiKey = "MY_API_KEY"

* Choose a model.
loAi.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.
lcFile_id = "file-5G2xncrEiHbVfYPRpFgP9c"
loAi.InputAddFileId(lcFile_id,"application/json")

loAi.InputAddText("Explain why Hamlet delays taking revenge, using only evidence from the file.")

* Ask the AI for text output.
lnSuccess = loAi.Ask("text")
IF (lnSuccess = 0) THEN
    ? loAi.LastErrorText
    RELEASE loAi
    CANCEL
ENDIF

* Get the text response.
loSbResponse = CreateObject('Chilkat.StringBuilder')
loAi.GetOutputTextSb(loSbResponse)
? loSbResponse.GetAsString()

RELEASE loAi
RELEASE loSbResponse