c++获取百度翻译API

以下是使用C++获取百度翻译API的代码示例：

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

using namespace std;

size_t writeCallback(char* buf, size_t size, size_t nmemb, void* up) {
    for (int c = 0; c < size * nmemb; c++) {
        ((string*)up)->push_back(buf[c]);
    }
    return size * nmemb;
}

string translate(string q, string from, string to) {
    string url = "http://api.fanyi.baidu.com/api/trans/vip/translate?"
                 "q=" + q +
                 "&from=" + from +
                 "&to=" + to +
                 "&appid=你的APPID" +
                 "&salt=1" +
                 "&sign=你的SIGN";
    CURL* curl = curl_easy_init();
    if (curl) {
        string response_string;
        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_string);
        curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        Json::Value root;
        Json::Reader reader;
        bool parsing_successful = reader.parse(response_string, root);
        if (!parsing_successful) {
            cerr << "Failed to parse the response data" << endl;
            return "";
        }
        int error_code = root["error_code"].asInt();
        if (error_code != 0) {
            cerr << "Translation failed with error code " << error_code << endl;
            return "";
        }
        string translation;
        const Json::Value translations = root["trans_result"];
        for (int i = 0; i < translations.size(); i++) {
            translation += translations[i]["dst"].asString();
        }
        return translation;
    }
    return "";
}

int main() {
    string translation = translate("Hello, world!", "en", "zh");
    cout << "Translation: " << translation << endl;
    return 0;
}

其中，需要替换其中的APPID和SIGN为自己的百度翻译API的APPID和签名。