行驶证识别 -奇异果体育app竞彩官网下载

#include 
#include 
// libcurl库下载链接：https://curl.haxx.se/download.html
// jsoncpp库下载链接：https://github.com/open-source-parsers/jsoncpp/
const static std::string request_url = "https://aip.baidubce.com/rest/2.0/ocr/v1/vehicle_license";
static std::string vehiclelicense_result;
/**
* curl发送http请求调用的回调函数，回调函数中对返回的json格式的body进行了解析，解析结果储存在全局的静态变量当中
* @param 参数定义见libcurl文档
* @return 返回值定义见libcurl文档
*/
static size_t callback(void *ptr, size_t size, size_t nmemb, void *stream) {
    // 获取到的body存放在ptr中，先将其转换为string格式
    vehiclelicense_result = std::string((char *) ptr, size * nmemb);
    return size * nmemb;
}
/**
* 行驶证识别
* @return 调用成功返回0，发生错误返回其他错误码
*/
int vehiclelicense(std::string &json_result, const std::string &access_token) {
    std::string url = request_url  "?access_token="  access_token;
    curl *curl = null;
    curlcode result_code;
    int is_success;
    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, curlopt_url, url.data());
        curl_easy_setopt(curl, curlopt_post, 1);
        curl_httppost *post = null;
        curl_httppost *last = null;
        curl_formadd(&post, &last, curlform_copyname, "image", curlform_copycontents, "【base64_img】", curlform_end);
        curl_easy_setopt(curl, curlopt_httppost, post);
        curl_easy_setopt(curl, curlopt_writefunction, callback);
        result_code = curl_easy_perform(curl);
        if (result_code != curle_ok) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(result_code));
            is_success = 1;
            return is_success;
        }
        json_result = vehiclelicense_result;
        curl_easy_cleanup(curl);
        is_success = 0;
    } else {
        fprintf(stderr, "curl_easy_init() failed.");
        is_success = 1;
    }
    return is_success;
}