(Objective-C) Referencing a Pre-Uploaded Image File by file_id in an AI Request

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Note: This example requires Chilkat v11.4.0 or greater.

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#import <CkoAi.h>
#import <NSString.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

success = NO;

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

CkoAi *ai = [[CkoAi alloc] init];

// OpenAI is currently the only AI provider that supports referencing a pre-uploaded image by file_id
// in a request for text generation.
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 an Image File to an AI Provider

// Use the file_id of the pre-uploaded file.
NSString *file_id = @"file-5CnBeuFasqNcAfti3cx4Fe";
[ai InputAddImageFileId: file_id mime_type: @"application/json"];

[ai InputAddText: @"What is in this image?"];

// Ask the AI for text output.
success = [ai Ask: @"text"];
if (success == NO) {
    NSLog(@"%@",ai.LastErrorText);
    return;
}

// Get the text response.
CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
[ai GetOutputTextSb: sbResponse];
NSLog(@"%@",[sbResponse GetAsString]);