simple chat-gpt request example

curl_gpt.cpp

#include <iostream>
#include <string>
#include <curl/curl.h>

// Callback function to write response data from API
size_t WriteCallback(void* contents, size_t size, size_t nmemb, std::string* response)
{
    size_t totalSize = size * nmemb;
    response->append((char*)contents, totalSize);
    return totalSize;
}

int main()
{
    // API key for ChatGPT
    std::string apiKey = "";

    // Prompt to send to ChatGPT
    std::string prompt = "Hello, ChatGPT!";

    // URL for ChatGPT API
    std::string apiUrl = "https://api.openai.com/v1/chat/completions";

    // Create a CURL handle for making the API request
    CURL* curl = curl_easy_init();

    if (curl)
    {
        // Set the request URL
        curl_easy_setopt(curl, CURLOPT_URL, apiUrl.c_str());

        // Set the request method as POST
        curl_easy_setopt(curl, CURLOPT_POST, 1L);

        // Set the API key as an Authorization header
        struct curl_slist* headers = nullptr;
        std::string authHeader = "Authorization: Bearer " + apiKey;
        headers = curl_slist_append(headers, authHeader.c_str());
        headers = curl_slist_append(headers, "Content-Type: application/json");
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

        // Set the JSON payload for the prompt
        std::string payload = "{\"prompt\": \"" + prompt + "\", \"max_tokens\": 100, \"model\": \"davinci\"}";
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, payload.c_str());

        // Set the callback function to capture the response
        std::string response;
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);

        // Perform the API request
        CURLcode res = curl_easy_perform(curl);

        // Check for errors
        if (res != CURLE_OK)
        {
            std::cerr << "API request failed: " << curl_easy_strerror(res) << std::endl;
        }
        else
        {
            // Print the response
            std::cout << "API response: " << response << std::endl;
        }

        // Clean up
        curl_easy_cleanup(curl);
        curl_slist_free_all(headers);
    }
    else
    {
        std::cerr << "Failed to initialize CURL" << std::endl;
    }

    return 0;
}