[C++] 365 ChatAIアプリの製作 その46 画像エンコードデータ送信 claude-3 

if (model.find("gpt") != string::npos){
    // gpt-4
    requestData = "{\"model\":\"" + model + "\", \"messages\":[{\"role\":\"system\",\"content\":\"" + systemStr + "\"},{\"role\":\"user\",\"content\":\"" + question + "\"}], \"temperature\":0.0}";
} else {
    if (urls == ""){
        // claude-3 画像なし
        requestData = "{\"model\":\"" + model + "\", \"messages\":[{\"role\":\"user\",\"content\":\"" + systemStr + question + "\"}], \"temperature\":0.0, \"max_tokens\":4096}";
    } else {
        // claude-3 画像あり
        string requestData_1 = "{\"model\":\"" + model + "\", \"messages\":[{\"role\":\"user\",\"content\":[{\"type\":\"text\",\"text\":\"" + systemStr + question + "\"},";
        vector<string> urlList = splitString(urls, '\n');
        cout << "urlListの要素数: " << to_string(urlList.size()) << endl;

        std::stringstream imageStream;
        for (size_t i = 0; i < urlList.size(); ++i) {
            // ローカル画像はBase64形式にエンコードする
            if (urlList[i].find("https:") != string::npos){
                cout << "claude3への画像URL送信には未対応" << endl;
                return "";
            } else {
                string base64_image = file_to_base64(urlList[i]);
                string file_extension = get_file_extension(urlList[i]);
                string url = "\"media_type\":\"image/" + file_extension + "\",\"type\":\"base64\", \"data\": \"" + base64_image + "\"";
                imageStream << "{\"type\": \"image\", \"source\": {" << url << "}}";
            }
            
            if (i < urlList.size() - 1) {
                imageStream << ",";
            }
        }

        std::string requestData_2 = imageStream.str() + "]}], \"max_tokens\": 4096,\"temperature\": 0.0}";
        cout << "requestData_2: \n" << requestData_2.c_str() << endl;

        requestData = requestData_1 + requestData_2;
    }
}