Swift

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.

Swift

func chilkatTest() {
    var success: Bool = false

    success = false

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

    let ai = CkoAi()!

    // 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.
    var file_id: String? = "file-5G2xncrEiHbVfYPRpFgP9c"
    ai.inputAddFileId(file_id: file_id, mime_type: "application/json")

    ai.inputAddText(text: "Explain why Hamlet delays taking revenge, using only evidence from the file.")

    // Ask the AI for text output.
    success = ai.ask(outputType: "text")
    if success == false {
        print("\(ai.lastErrorText!)")
        return
    }

    // Get the text response.
    let sbResponse = CkoStringBuilder()!
    ai.getOutputTextSb(sb: sbResponse)
    print("\(sbResponse.getAsString()!)")

}