C 使用libcurl与json-c方法

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#include <stdio.h>#include <string.h>#include <stdlib.h>#include <unistd.h>#include <curl/curl.h>#include <json/json.h>struct curl_return_string {    char *str;    size_t len;    size_t size;}; // 用于存curl返回的结果size_t _recive_data_from_http_api(void *buffer, size_t size, size_t nmemb, void *user_p){*/    struct curl_return_string *result_t = (struct curl_return_string *)user_p;    if (result_t->size < ((size * nmemb) + 1)) {        result_t->str = (char *)realloc(result_t->str, (size * nmemb) + 1);        if (result_t->str == NULL) {            return 0;        }        result_t->size = (size * nmemb) + 1;    }    result_t->len = size * nmemb;    memcpy(result_t->str, buffer, result_t->len);    result_t->str[result_t->len] = '\0';    return result_t->len;}int get_mail_signature_status(char *url, char *subject, char *body){    int ret_mail = 0;    // 声明保存返回 http 的结果    struct curl_return_string curl_result_t;    curl_result_t.len = 0;    curl_result_t.str = (char *)calloc(1, 1024);    if (curl_result_t.str == NULL) {        log_error("calloc fail for curl_result_t.str");        return 0;    }    curl_result_t.size = 1024;    curl_global_init(CURL_GLOBAL_ALL);    CURL *curl;    CURLcode ret;    // init curl    curl = curl_easy_init();    if (!curl) {        log_error("couldn't init curl");        return 0;    }    curl_easy_setopt(curl, CURLOPT_URL, url);    curl_easy_setopt(curl, CURLOPT_POST, 1);    // use post     // urlencode post data    char *subject_encode = curl_easy_escape(curl, subject, strlen(subject));    if (!subject_encode) {        log_error("urlencode subject fail, so use source data");        subject_encode = subject;    }    char *body_encode = curl_easy_escape(curl, body, strlen(body));    if (!body_encode) {        log_error("urlencode body fail, so use source data");        body_encode = body;    }    int request_data_len = 18 + strlen(subject_encode) + strlen(body_encode) + 2;    char *request_data = (char *)calloc(1, request_data_len) ;    if (request_data == NULL) {        log_error("calloc fail for request_data");        curl_easy_cleanup(curl);        curl_global_cleanup();        return 0;    }    snprintf(request_data, request_data_len, "subject=%s&content=%s", subject_encode, body_encode);    log_debug("request data:%s\n", request_data);    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, request_data);    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _recive_data_from_http_api);    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &curl_result_t);  // 传这个参数过去    ret = curl_easy_perform(curl);    if(ret != CURLE_OK) {        log_error("curl_easy_perform() failed:%s, url:%s", curl_easy_strerror(ret), url);    } else {        if (curl_result_t.str) {            log_info("request url:%s response:%s", url, curl_result_t.str);            // parse result with json            // {"err_code":200,"err_msg": "this is no error", "sign":11281921309418229, "status": 1}'            struct array_list *tmp_array;            struct json_object *tmp_obj;            struct json_object *result_json;            result_json = json_tokener_parse(curl_result_t.str);            tmp_obj = json_object_object_get(result_json, "err_code");            int err_code = json_object_get_int(tmp_obj);            if (err_code == 0) {                tmp_obj = json_object_object_get(result_json, "sign");                const char *key = json_object_get_string(tmp_obj);                tmp_obj = json_object_object_get(result_json, "status");                int status = json_object_get_int(tmp_obj);                log_info("key[%s] status[%d]\n", key, status);                // status: 0:非垃圾；1：垃圾邮件; 2: 疑似垃圾                ret_mail = status;            } else {                log_info("call signature api fail:%s", curl_result_t.str);                ret_mail = 0;            }        }    }    if (subject_encode != NULL) {        free(subject_encode);        subject_encode = NULL;    }    if (body_encode != NULL) {        free(body_encode);        body_encode = NULL;    }    if (request_data != NULL) {        free(request_data);        request_data = NULL;    }    if (curl_result_t.str != NULL) {        free(curl_result_t.str);        curl_result_t.str = NULL;        curl_result_t.len = 0;        curl_result_t.size = 0;    }    curl_easy_cleanup(curl);    curl_global_cleanup();    return ret_mail;}int main(int argc, char **argv){    char signature_url[] = "http://10.29.11.110/monitor/curl_test.php";        int ret = get_mail_signature_status(signature_url, argv[1], argv[2]);    switch (ret) {        case 0:            printf("is good mail\n");            break;        case 1:            printf("is bad mail\n");            break;        case 2:            printf("is unknown mail\n");            break;        default:            printf("has error\n");            break;    };    return 0;}
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